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 73 ponitac 455 with 4x heads
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rustytinman1955
Tribal Scout

USA
24 Posts

Posted - 25 Jul 2012 :  6:40:03 PM  Show Profile  Reply with Quote
ok guys i found a set of kieth black pistons from summit they will give me 9.49 comp with my 72 cc # 142 heads
after the machine shop looked at both the 142s that are ready to go and the 6x 8s which appear to need to be redone i have decided to stick with the 142s gonna use a special forge piston contacted summit and another outfit they both agreed this combination would work for me . my question is what should i expect to pay for the block cooking machining bored .030 cam bearings installed , my stock rods checked etc and pistons installed on rods the pistons are the kb #371 i know different machine shops will varry but hoping you guys can give me a figure to look forward too thanks.

dave phelps
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cortcomp
Coyote

USA
5335 Posts

Posted - 25 Jul 2012 :  7:25:34 PM  Show Profile  Visit cortcomp's Homepage  Reply with Quote
1) never trust anything summit says, they don't know anything about pontiacs.

If you're 9.5 compression with those heads, you're good to go.

Local shop was like $250 plus parts to assembly rotating assembly, balancing if you wanted it done was more. There were extra charges to install a sleeve, and i didn't need boring.
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Phil
The Great White Buffalo

USA
7214 Posts

Posted - 25 Jul 2012 :  8:14:44 PM  Show Profile  Reply with Quote
Anyone else hear the ticking noise?

Bowties are for Pee-wee Herman. "Chevy": even the name sounds cheap, but not as cheap as your Pontiac will be with an LS transplant.
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sixt8bird
Chief Many Horses

USA
1114 Posts

Posted - 25 Jul 2012 :  9:10:12 PM  Show Profile  Visit sixt8bird's Homepage  Reply with Quote
Man it's too bad you didn't consult us before the $600 head purchase as another $1000 and you would have a 400 with a stroker kit fully balanced, matched parts and high grade stuff for a long lasting powerful engine.

Edited by - sixt8bird on 25 Jul 2012 9:10:48 PM
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Blued and Painted
Chief PONTIAC

USA
3404 Posts

Posted - 25 Jul 2012 :  9:13:53 PM  Show Profile  Reply with Quote
many people run porcupine rods.


Bull Nose Formula/ 461/ Q-Jet/
TH400/ 3.08 8.5 / R44TS.

Edited by - Blued and Painted on 26 Jul 2012 09:45:40 AM
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Admin
Ye Olde Webmaster

844 Posts

Posted - 26 Jul 2012 :  05:06:10 AM  Show Profile  Reply with Quote
Tick...tick...tick....

"Dedicated to keeping the classic Pontiac engine alive."

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Blued and Painted
Chief PONTIAC

USA
3404 Posts

Posted - 26 Jul 2012 :  09:59:07 AM  Show Profile  Reply with Quote
I think it's my beer refrigerator.


Bull Nose Formula/ 461/ Q-Jet/
TH400/ 3.08 8.5 / R44TS.
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Bill Boyle
Horse Feathers (Charter Member)

USA
4793 Posts

Posted - 26 Jul 2012 :  10:40:47 AM  Show Profile  Visit Bill Boyle's Homepage  Reply with Quote
Beer refrigerator? Loud? Must be a Binford.

"Dedicated to keeping the classic Pontiac engine alive."

----
400 bored +.030, forged TRW pistons, ported 62 heads, Hedman headers, 2.5 SS dual exhaust X Pypes, Comp 276AH10 cam, Scorpion 1.65 RR, 850 Q-jet, stock intake & tuned HEI; original owner.
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jeff
Buffalo

USA
93 Posts

Posted - 26 Jul 2012 :  6:40:42 PM  Show Profile  Reply with Quote
I bought a 73 last year that has a engine in it built by Denny's auto machine, INC. Williamsport Md. I have the receipts from them. Now I want you to keep in mind they built the engine in 2008 and I can't say that it was in the same condition when I bought it as when it left there shop. But I will tell you the po didn't know how to adjust the carb. choke, door windows or hood hinges. The engine is a 400 with # 12 heads. The po admitted he made a mistake by telling them that Pontiacs never made power, the engine had better make power when he got it back and it was to be drivin on the street on pump gas. It wasn't a daily driver. They put a Comp. 296ah cam in it ( .562/.577 lift, 246/253 duration @ .050) with Comp. 1.65 rockers. It had a performer intake on it. They didn't machine the heads for push rod clearance, they were rubbing. The spark plugs were the gasket type not the correct tapered seat plugs (r45ts on receipt). I couldn't figure out which pistons were used from the receipts. So I called and spoke to Denny himself. He told me which pistons were used and that the block had not been decked. The heads were resurfaced according to the receipt. I explained that I was going to change the cam to get it through emissions inspection. He informed me I would be killing the engine because it was a 10.5 or 10.75:1 engine. With the info from the receipts and Denny the comp. ratio is close to 10:1.
Sorry to be long winded guy's, but he did ask.

73 Formula 72 T/A clone 406 #12 heads, Comp 280H, RPM intake,hooker comp. headers, Scorpion rockers 4spd. 3:42 gears
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cortcomp
Coyote

USA
5335 Posts

Posted - 26 Jul 2012 :  7:45:01 PM  Show Profile  Visit cortcomp's Homepage  Reply with Quote
I don't know a lot about cams, but that seems like a BIG BIG cam for a 400 on the street.
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Blued and Painted
Chief PONTIAC

USA
3404 Posts

Posted - 26 Jul 2012 :  10:37:12 PM  Show Profile  Reply with Quote
That cam has 84 degrees overlap. recomended 4000 stall with 4.11 gear or better. I'd send it back to comp and have e'm grind it again. I'm sure there's enough meat left on it for almost any custom grind. Oops i forgot about the small base circle


Bull Nose Formula/ 461/ Q-Jet/
TH400/ 3.08 8.5 / R44TS.

Edited by - Blued and Painted on 26 Jul 2012 10:41:53 PM
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cortcomp
Coyote

USA
5335 Posts

Posted - 26 Jul 2012 :  11:30:39 PM  Show Profile  Visit cortcomp's Homepage  Reply with Quote
My smaller base circle cam required different length pushrods. Little extra cost, FWIW.
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Phil
The Great White Buffalo

USA
7214 Posts

Posted - 27 Jul 2012 :  06:39:34 AM  Show Profile  Reply with Quote
Yikes! Dennys should stick to bacon and eggs ! Sounds like even a Chevy would be a challenge for them to build.

Bowties are for Pee-wee Herman. "Chevy": even the name sounds cheap, but not as cheap as your Pontiac will be with an LS transplant.
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jeff
Buffalo

USA
93 Posts

Posted - 27 Jul 2012 :  06:46:37 AM  Show Profile  Reply with Quote
I replaced that cam long ago. I've still got it if anyone is interested. It only has about 500 miles on it because the car ran so bad. I have the receipt for the machine shop installing the engine, carb to oil pan along with some other work. That cam, performer intake, 3:42 gears, muncie 4 spd, new box stock 770 street avenger and a new msd ready run with the stock slow timing curve. What a combination.
The po told me that he took the car back because it ran terrible, the machine shop said it had taken out a cam lobe. They replaced it under warranty and gave him the car back. It was better but still didn't run good at all. He tried to make the car drivable by doing the only things he knew how to do, he pulled the new holley and put a kit in it. Still stock carb., no better. Then he pulled it and put a new eddy 750 on it, another $316. Still ran no better, disgusted and not wanting to throw more money at it he sold it.

73 Formula 72 T/A clone 406 #12 heads, Comp 280H, RPM intake,hooker comp. headers, Scorpion rockers 4spd. 3:42 gears
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jeff
Buffalo

USA
93 Posts

Posted - 27 Jul 2012 :  07:01:16 AM  Show Profile  Reply with Quote
If I had known what I know now about the engine I would not have bought the car. Thankfully the po didn't drive it much because he knew it wasn't running right. The guy seemed very honest, receipts and wear on some items like tires, cap and rotor etc. seem to confirm his story. I found nothing left loose other than the fuel tank sending unit ground and no leaks. The valve springs appear to have been shimmed for installed height. I have had the motor to 6,000 a few times and it is still together.

73 Formula 72 T/A clone 406 #12 heads, Comp 280H, RPM intake,hooker comp. headers, Scorpion rockers 4spd. 3:42 gears
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Blued and Painted
Chief PONTIAC

USA
3404 Posts

Posted - 27 Jul 2012 :  10:32:54 AM  Show Profile  Reply with Quote
Jeff, what's your current plan for the car.


Bull Nose Formula/ 461/ Q-Jet/
TH400/ 3.08 8.5 / R44TS.
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jeff
Buffalo

USA
93 Posts

Posted - 27 Jul 2012 :  11:32:52 AM  Show Profile  Reply with Quote
B.P., I'm not realy sure what you are asking. We plan on doing some cruise in's, mainly a street toy. Once I get the car dialed in it will probably see very little track time. I swapped the cam for a comp 280h custom ground with a 113lsa and 109icl, swapped the performer for a rpm and the Blocker drop base kit to get the shaker back where it belongs.Swapped the 1.65 rockers with scorpion 1.5's. Put the holley back on and jetted accordingly, recurved the dist. I'm still working on the carb. since I found a off idle bog when I put the nitto's on. The car is very well mannered now, could be easily be a daily driver. I can't stand a car that doesn't run right or can't put the available power to the ground.

73 Formula 72 T/A clone 406 #12 heads, Comp 280H, RPM intake,hooker comp. headers, Scorpion rockers 4spd. 3:42 gears
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cortcomp
Coyote

USA
5335 Posts

Posted - 27 Jul 2012 :  12:21:38 PM  Show Profile  Visit cortcomp's Homepage  Reply with Quote
Sounds like you reversed a lot of the "features" that were blindly applied by the previous builder.
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jeff
Buffalo

USA
93 Posts

Posted - 27 Jul 2012 :  12:34:14 PM  Show Profile  Reply with Quote
I'm pretty happy with the way the engine runs now. I've never had a engine that couldn't use a few more horsepower. The po admitted he may not have communicated his intentions for the car well enough to the machine shop. It did pull pretty good from 3'500 up wot, but I hadn't been in anything with any power to speak of in probably 10 years. It would have been neat to have before and after dyno numbers or time slips. I just didn't want to spend the time or money to tune it with that cam and then have to do it all over again. I'm real confident it is quicker now.

73 Formula 72 T/A clone 406 #12 heads, Comp 280H, RPM intake,hooker comp. headers, Scorpion rockers 4spd. 3:42 gears
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Blued and Painted
Chief PONTIAC

USA
3404 Posts

Posted - 27 Jul 2012 :  12:37:13 PM  Show Profile  Reply with Quote
sounds good from here.


Bull Nose Formula/ 461/ Q-Jet/
TH400/ 3.08 8.5 / R44TS.
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rustytinman1955
Tribal Scout

USA
24 Posts

Posted - 28 Nov 2012 :  4:12:40 PM  Show Profile  Reply with Quote
hey guys been a while well i have since had my 455 machined and bored out .30 to go with my 142 heads 72 cc i have since purchased my summit 2802 cam aquired kieth black 371.30 pistons i was informed my compression would 9.5 . crank and pistons currently at pittsburgh crankshaft being turned and balanced .My next question is will the stock 73 455 intake mount to my 142 heads or should i seek another intake . how do i go about downloading my bird photos on this site. anyways slowly but surely i believe it will come together ,

dave phelps
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Phil
The Great White Buffalo

USA
7214 Posts

Posted - 28 Nov 2012 :  5:39:48 PM  Show Profile  Reply with Quote
What did you end up doing about the manhole cover rods?

Bowties are for Pee-wee Herman. "Chevy": even the name sounds cheap, but not as cheap as your Pontiac will be with an LS transplant.
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Blued and Painted
Chief PONTIAC

USA
3404 Posts

Posted - 28 Nov 2012 :  5:46:49 PM  Show Profile  Reply with Quote
looks like a 30.5 cc dish. 9.32 to 1. Zero deck will bring it to 9.50 to 1


Bull Nose Formula/ 461/ Q-Jet/
TH400/ 3.08 8.5 / R44TS.
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rustytinman1955
Tribal Scout

USA
24 Posts

Posted - 28 Nov 2012 :  7:47:37 PM  Show Profile  Reply with Quote
what do you mean phil
quote:
Originally posted by Phil

What did you end up doing about the manhole cover rods?


dave phelps
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rustytinman1955
Tribal Scout

USA
24 Posts

Posted - 28 Nov 2012 :  7:49:10 PM  Show Profile  Reply with Quote
i have the rods that came with the 142s

dave phelps
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Phil
The Great White Buffalo

USA
7214 Posts

Posted - 28 Nov 2012 :  8:53:51 PM  Show Profile  Reply with Quote
Stock cast rods?

Bowties are for Pee-wee Herman. "Chevy": even the name sounds cheap, but not as cheap as your Pontiac will be with an LS transplant.
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rustytinman1955
Tribal Scout

USA
24 Posts

Posted - 28 Nov 2012 :  9:32:28 PM  Show Profile  Reply with Quote
yes using the stock rod from my 73 according to all the reading up i have done from jim hand etc the stock rods are as good or better then aftermarket sorry i was thinking lifter rods

dave phelps
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cortcomp
Coyote

USA
5335 Posts

Posted - 28 Nov 2012 :  9:35:21 PM  Show Profile  Visit cortcomp's Homepage  Reply with Quote
??? I don't recall ever reading that the stock rods are as good or better than anything? Now, the stock crank, that's a different story...
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rustytinman1955
Tribal Scout

USA
24 Posts

Posted - 28 Nov 2012 :  9:40:10 PM  Show Profile  Reply with Quote
any recomendations on what type of distributor i should install and will i have to do to my wireing to adapt pointless ignition yo the 68

dave phelps
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Merrik66
Cochise

USA
370 Posts

Posted - 29 Nov 2012 :  02:27:13 AM  Show Profile  Reply with Quote
There is some info out there that does say stock pontiac connecting rods are ok for mild builds if they are checked for straight, resize big end, and otherwise in good condition. But here's the thing, nowadays you spend over 100$ to have those rods cleaned, checked, resized etc. and for 200$ more you get new ones which ARE much stronger. ..btw.. I hope we're talkin about con rods.. As far as distributor goes Rusty, find an HEI type, they're easy to install. Just make sure you drop it in the right place at the right time..pardon the pun. TDC #1 ..place distributor in so the rotor points just before #1terminal/plug wire. Rotates Counterclockwise.. 18436572. Quickly find the sweet spot, tighten more..check timing. Eye on temp. Adjust timing again and pay attention to it. Keep a fire extinguisher nearby..a full one. Just to be safe. Hope you get it goin.
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Merrik66
Cochise

USA
370 Posts

Posted - 29 Nov 2012 :  02:30:06 AM  Show Profile  Reply with Quote
Regarding that HEI ..it does need power. easy to run one from ign/ fuse block.
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Blued and Painted
Chief PONTIAC

USA
3404 Posts

Posted - 29 Nov 2012 :  11:18:52 AM  Show Profile  Reply with Quote
Good safty advice Merrik! Not many pontiac guys left so no accedently departed members or cars will be tollerated.


Bull Nose Formula/ 461/ Q-Jet/
TH400/ 3.08 8.5 / R44TS.
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Blued and Painted
Chief PONTIAC

USA
3404 Posts

Posted - 29 Nov 2012 :  11:33:01 AM  Show Profile  Reply with Quote
I think the max rpm on a porcupine rod (Prickly to the touch) is 5750. Add forty years of abuse and i think there down to about 4900.


Bull Nose Formula/ 461/ Q-Jet/
TH400/ 3.08 8.5 / R44TS.
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Phil
The Great White Buffalo

USA
7214 Posts

Posted - 29 Nov 2012 :  2:34:33 PM  Show Profile  Reply with Quote
That may be true on a 3.75 stroke engine, but the max rpm is less IMHO with the longer stroke cranks. While I've yet to break a stock rod (however I have spun my share of rod bearings), I have my own self imposed rpm limit of 5500 for 350/400 and 5000 for a 455. Nowadays of course, I won't use a stock rod for anything other than wall art or throwing at rude/obnoxious drivers on the road.

Bowties are for Pee-wee Herman. "Chevy": even the name sounds cheap, but not as cheap as your Pontiac will be with an LS transplant.

Edited by - Phil on 29 Nov 2012 2:35:04 PM
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Tesla49
Tribal Scout

15 Posts

Posted - 11 Aug 2016 :  10:55:59 PM  Show Profile  Reply with Quote
wish I found this post before I spent 5k with Denny's Auto Machine. I bought the engine because he claimed he built them all the time to run on pump gas. Tech installed the engine, told me it was missing an accessory hole for alternator, the engine had #48 heads, called Denny and he claimed all pontiac heads have the same amount of accessory holes, I should have known I was in trouble. A couple hours later tech calls me and tells me he cant get the engine dialed in and to call Denny and find out if he CC'd the heads because it seemed to have too much compression. Denny said he didn't CC the heads but that he knew they were 72CC (oh boy), finally Denny said to put the timing at 28 degrees total at 2800rpm and no vacuum advance, tech told me it would run like a 77 stock engine with that timing, he was close to right, I drove the car around town for a couple days, first I heard tapping from the right side lifters, had good oil pressure temp solid on 185 degrees, fresh sunoco 93 octane in a $20k body which included a new gas tank. 8 miles later, engine started knocking, never even got to break in the engine and never went over 3k rpm to know what the engine could do, it also developed a rear main seal leak. Turns out the entire bottom end was wiped out, Denny blamed fuel, timing, and chinese pcv valves. Car sits in driveway, too disgusted to even put it in the garage.
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Phil
The Great White Buffalo

USA
7214 Posts

Posted - 12 Aug 2016 :  09:34:06 AM  Show Profile  Reply with Quote
Sorry for your loss..
Another idiot with keys to a machine shop. What part of the Country is this a$$clown performing his Pontiac abortions?

Bowties are for Pee-wee Herman. "Chevy": even the name sounds cheap, but not as cheap as your Pontiac will be with an LS transplant.

Edited by - Phil on 12 Aug 2016 09:34:46 AM
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cortcomp
Coyote

USA
5335 Posts

Posted - 12 Aug 2016 :  10:37:16 AM  Show Profile  Visit cortcomp's Homepage  Reply with Quote
That's a shame, sorry to hear about your luck. You were right about that bad feeling when you were missing the accessory bolt hole and he thought they were all the same. I would not hesitate to basically ask for all of your money back, or head straight to small claims and file the next day.

Point out that you've talked to some pontiac specialists that will happily detail everything he did wrong in the basic planning of this motor, and how it could have only ended up in the exact failure that happened.

You might get nothing, but filing is cheap and will make you feel better, and likely you'll get some compensation.

I would NOT take him up on the offer that comes after that to rebuild it for you.

I am not a lawyer, this is not to be construed as legal advice.
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Admin
Ye Olde Webmaster

844 Posts

Posted - 12 Aug 2016 :  2:29:53 PM  Show Profile  Reply with Quote
Tesla --

Ugh! Shoddy work. Insist on getting your money back from him.

"Dedicated to keeping the classic Pontiac engine alive."

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Tesla49
Tribal Scout

15 Posts

Posted - 16 Aug 2016 :  10:36:46 PM  Show Profile  Reply with Quote
Yeah I am working on that now, but you know how long that drags out, starting with BBB first, my attorney said its best to try to work it out that way first. Thing that makes me feel like a dope is that I am an ex ASE Tech, I built Jaguar, Lexus/Toyota engines, and of course a few chevys, but not a pontiac 400. I originally planned to do it myself, but after I got some quotes on machining it didn't make financial sense (so I thought), plus I knew I couldn't dedicate my time to it, and I heard rumors that Pontiac engines are not chevy engines where you can get by throwing just anything at it. The shop that put the engine in knew right away something was wrong, I was sick... but I went along with Dennys 28 total advance recommendation because I figured it was warrantied so I will do what he says. I sent the engine back to him after it started knocking and he went off on me claiming it was bad fuel bla bla bla, right there I knew I was really screwed, when someone starts blaming everything but themselves, especially when they are talking out their rear, I knew it would be a battle, so I paid him an addition 1k to get it repaired, we were getting pretty heated in our conversations to a point I didn't even want to hear from him till the engine was repaired, I was to the point that I was going to do or say something I would regret and a drive to Maryland was not doable at the time. When I got the engine back, the tech put it in again and he told me to tow it home and don't drive it till I resolve the problem, either change heads or pistons, he also said the xe268 comp cam really wasn't a great choice. I feel bad for the Tech because he spent many hours unpaid trying to come up with a solution without taking the engine apart. He thinks the compression is probably closer to 11.3 to 1 than the 10.7 Denny claims.

Edited by - Tesla49 on 16 Aug 2016 10:45:31 PM
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Tesla49
Tribal Scout

15 Posts

Posted - 16 Aug 2016 :  10:42:47 PM  Show Profile  Reply with Quote
If anyone has had a Denny's Auto Machine Pontiac 400 built, I would love to hear from them to see how their build went.

Edited by - Tesla49 on 22 Aug 2016 08:56:38 AM
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Phil
The Great White Buffalo

USA
7214 Posts

Posted - 17 Aug 2016 :  09:19:08 AM  Show Profile  Reply with Quote
Does this guy work out of his house?

Bowties are for Pee-wee Herman. "Chevy": even the name sounds cheap, but not as cheap as your Pontiac will be with an LS transplant.
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js292
Sitting Bull

USA
128 Posts

Posted - 17 Aug 2016 :  10:35:35 AM  Show Profile  Reply with Quote
It's sad when a professional builder can't build a Pontiac motor. I built my first one when I was 18 with nothing more than a manual and cheap torque wrench (before there was internet), but then again I think I was actually smarter back then ;)



71 Formula 455
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Tesla49
Tribal Scout

15 Posts

Posted - 17 Aug 2016 :  11:10:46 AM  Show Profile  Reply with Quote
Not sure never been there, someone saw an ad he had, I think it was on ebay or you tube and gave me his number. A friend of mine recommended a pontiac guy out of phillipsburg, nj but when I tried to contact him the shop was closed, and I later learned he passed away, so my friends were trying to help me locate someone, that how I ended up with Denny's. After the fact another friend whom I really don't get to talk to too much recommended hansen racing in NJ. real great guy, he wants to try to help me get my firebitch on the road, he didn't see the engine but from what I told him he said the same as everyone else, too much compression, he likes to keep his street builds 9 -9.5 compression for just that reason. The engine being bored and decked as well as the kb hyp. pistons a 6x 4 head would be an affordable fix he says, as long as nothing else is botched in the engine.
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cortcomp
Coyote

USA
5335 Posts

Posted - 17 Aug 2016 :  11:23:15 AM  Show Profile  Visit cortcomp's Homepage  Reply with Quote
Holy crap, 11:1 on iron heads, 4x no less? I kind of doubt that unless he used pistons with the hump that juts up into the chamber, most 4x heads are a sizable cc. The XE cam would build pressure on top of that. I'm wondering if you just switch to one of the summit grinds or the crowers the high comp guys like and you're good to go.
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cortcomp
Coyote

USA
5335 Posts

Posted - 17 Aug 2016 :  11:24:57 AM  Show Profile  Visit cortcomp's Homepage  Reply with Quote
Maybe i missed it, what is the cranking PSI on your motor now? (Rolling over with starter, throttle WOT, ignition disconnected for no spark obviously)
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Phil
The Great White Buffalo

USA
7214 Posts

Posted - 17 Aug 2016 :  12:12:30 PM  Show Profile  Reply with Quote
X2 to what Cort said. What did he do to your 4x heads? You shouldn't have to spend more money switching to 6x as they are quite similar unless he butchered your 4x's.

Can you provide more details as to what he did with the build?

Also, where are you located? It sounds as though we may not be too far away from each other.

Bowties are for Pee-wee Herman. "Chevy": even the name sounds cheap, but not as cheap as your Pontiac will be with an LS transplant.
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Tesla49
Tribal Scout

15 Posts

Posted - 17 Aug 2016 :  4:27:27 PM  Show Profile  Reply with Quote
the heads are #48 not 4x.
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Tesla49
Tribal Scout

15 Posts

Posted - 17 Aug 2016 :  4:38:38 PM  Show Profile  Reply with Quote
pontiac 400 block, .060 over, kb133 hyp. pistons, 51-223-4 comp cam, 852-16 lifters, 1451-16 comp roller rockers, .005 off the deck, not sure how much off the #48 heads since he didn't CC them. Im in North Jersey, about 5 hour ride. I have debated going there, I can tell you we both don't see eye to eye on who is to blame here, but I am 95% sure it ain't my tech, especially knowing what I know now from all the research I have had to do to try to figure this out, and seeing others had an issue, I am pretty sure it will not be a pleasant experience for either one of us if I drive down there. Best to let a third party handle it at this point.
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cortcomp
Coyote

USA
5335 Posts

Posted - 17 Aug 2016 :  5:47:36 PM  Show Profile  Visit cortcomp's Homepage  Reply with Quote
Sorry, i was looking at original post, not yours.

I checked on wallace's calculator, using the following GUESSES:

400 .060 0ver
69 48 heads: 75ccs
Piston 6cc dish for valve relief
gasket thickness: .039
deck height .015
------------------------
11.00 on the money. Jesus. 11.3 if they're really 72ccs. That's like aluminum head goals, not iron. No cam that i've heard of will help there. E85 maybe ;)

Yeah, a head swap + cam swap or both will help you out. Good news is neither is too pricey and can be done on a saturday if the bottom of the motor is ok.
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Tesla49
Tribal Scout

15 Posts

Posted - 17 Aug 2016 :  8:01:32 PM  Show Profile  Reply with Quote
thats exactly what Hansen racing said. another 1k to 1500. but again hoping the rest is right.
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