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 455 bonniville
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jd63
Tribal Scout

Canada
4 Posts

Posted - 30 Jul 2017 :  11:35:48 AM  Show Profile  Reply with Quote
Hi I have a 1970 360hp 455 yh block with 15 heads I'm going to put it in a 81 trans am what do I need to do to it to make it into a good runner. is there a better cam and are the heads a good pair and any upgrades to the bottom end that can be done. the car will have a auto over drive and 342 or 373 gears Thanks

Bill Boyle
Horse Feathers (Charter Member)

USA
4797 Posts

Posted - 30 Jul 2017 :  1:39:12 PM  Show Profile  Visit Bill Boyle's Homepage  Reply with Quote
The sky is the limit with a big budget. $$$ How much do you have to spend? What are your plans for the car in terms of use? Do you want a 14 second car? A 13 second car? 12? 11 or quicker? Let us know.

"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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jd63
Tribal Scout

Canada
4 Posts

Posted - 30 Jul 2017 :  3:18:54 PM  Show Profile  Reply with Quote
I just want a nice cruiser that's quick when it needs to be and has some gas mileage so a guy can afford to drive to a movie or car show. I don't need to win every race
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Hikin Mike
Tribal Scout

USA
21 Posts

Posted - 30 Jul 2017 :  10:11:27 PM  Show Profile  Visit Hikin Mike's Homepage  Reply with Quote
I have that block in my car. I'm using different heads (6S-7) though. You may want to think about using a 3:70 gear. I ran that for a while and it was fine at the track, but in the highway, not so much. I switched to a 3.00 (I have a Ford 9") and I can cruise on the highway around 2500 rpm. A recent trip to Yosemite I saw about 16 MPG.

- Mike



'69 Firebird 400 - Goldenrod Yellow, 455 +.060, '6s-7' heads, Comp Cam 276AH-10 (#51-309-4), TH400, Ford 9-inch w/3.08, 800cfm Q-jet, Stock Intake, Hooker Headers, Flowmasters
'68 Coronet 500 Convertible - Medium Gold Metallic, stock 318 +100,000 miles

Edited by - Hikin Mike on 30 Jul 2017 10:14:08 PM
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Hikin Mike
Tribal Scout

USA
21 Posts

Posted - 30 Jul 2017 :  10:16:16 PM  Show Profile  Visit Hikin Mike's Homepage  Reply with Quote
quote:
Originally posted by Bill Boyle

The sky is the limit with a big budget. $$$ How much do you have to spend? What are your plans for the car in terms of use? Do you want a 14 second car? A 13 second car? 12? 11 or quicker? Let us know.



I noticed your running the same cam I'm using, but I've got a 455.

- Mike



'69 Firebird 400 - Goldenrod Yellow, 455 +.060, '6s-7' heads, Comp Cam 276AH-10 (#51-309-4), TH400, Ford 9-inch w/3.08, 800cfm Q-jet, Stock Intake, Hooker Headers, Flowmasters
'68 Coronet 500 Convertible - Medium Gold Metallic, stock 318 +100,000 miles
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Bill Boyle
Horse Feathers (Charter Member)

USA
4797 Posts

Posted - 31 Jul 2017 :  07:50:44 AM  Show Profile  Visit Bill Boyle's Homepage  Reply with Quote
Mike--how does that cam handle things in the 455+ block? What kind of vacuum do you see at idle?

Bill

"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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Hikin Mike
Tribal Scout

USA
21 Posts

Posted - 02 Aug 2017 :  2:18:22 PM  Show Profile  Visit Hikin Mike's Homepage  Reply with Quote
quote:
Originally posted by Bill Boyle

Mike--how does that cam handle things in the 455+ block? What kind of vacuum do you see at idle?

Bill



It pulls 10" at idle. No issues with my power brakes. Here's a video if you're interested: https://youtu.be/5hbCBFuqVhs

I've been using it since 1995-ish. Never had a chance to take it to the track. With technology as it is now, I've been wondering if I need to look for another cam. But since I'm on a fixed income and I'm happy with how it sounds/runs, I doubt I'll be changing it any time soon.

- Mike



'69 Firebird 400 - Goldenrod Yellow, 455 +.060, '6s-7' heads, Comp Cam 276AH-10 (#51-309-4), TH400, Ford 9-inch w/3.08, 800cfm Q-jet, Stock Intake, Hooker Headers, Flowmasters
'68 Coronet 500 Convertible - Medium Gold Metallic, stock 318 +100,000 miles
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cortcomp
Coyote

USA
5339 Posts

Posted - 02 Aug 2017 :  2:44:02 PM  Show Profile  Visit cortcomp's Homepage  Reply with Quote
10" and no power brake issues? That's great! I usually hear about issues when people are under like that 13-15 mark.
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Hikin Mike
Tribal Scout

USA
21 Posts

Posted - 02 Aug 2017 :  3:54:56 PM  Show Profile  Visit Hikin Mike's Homepage  Reply with Quote
quote:
Originally posted by cortcomp

10" and no power brake issues? That's great! I usually hear about issues when people are under like that 13-15 mark.



Unless the gauge is wrong or I'm just used to how my brakes work after 25+ years of driving it...lol!

- Mike



'69 Firebird 400 - Goldenrod Yellow, 455 +.060, '6s-7' heads, Comp Cam 276AH-10 (#51-309-4), TH400, Ford 9-inch w/3.08, 800cfm Q-jet, Stock Intake, Hooker Headers, Flowmasters
'68 Coronet 500 Convertible - Medium Gold Metallic, stock 318 +100,000 miles
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Hikin Mike
Tribal Scout

USA
21 Posts

Posted - 02 Aug 2017 :  4:07:32 PM  Show Profile  Visit Hikin Mike's Homepage  Reply with Quote
quote:
Originally posted by Bill Boyle

Mike--how does that cam handle things in the 455+ block? What kind of vacuum do you see at idle?

Bill



Just curious. How much vacuum does your 400 pull?

- Mike



'69 Firebird 400 - Goldenrod Yellow, 455 +.060, '6s-7' heads, Comp Cam 276AH-10 (#51-309-4), TH400, Ford 9-inch w/3.08, 800cfm Q-jet, Stock Intake, Hooker Headers, Flowmasters
'68 Coronet 500 Convertible - Medium Gold Metallic, stock 318 +100,000 miles
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Blued and Painted
Chief PONTIAC

USA
3409 Posts

Posted - 03 Aug 2017 :  10:12:28 AM  Show Profile  Reply with Quote
Im running around 11 inches of vac. It stops good but i must conserve vacuum. No extra pumping of the pedal or the pedal gets hard, the eyes get wide, and the but cheeks tighten up.


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

USA
5339 Posts

Posted - 03 Aug 2017 :  10:23:04 AM  Show Profile  Visit cortcomp's Homepage  Reply with Quote
That's how my 455/XE284 was B&P. I'd get 2ish good pumps then hard. The hidden audi vac pump and can was a cheap and fun project that made it stop a LOT better, and gave me lots of confidence back. The pump ran until the can/system hit 19 inches. So if you were driving it would kick on and off but you wouldn't really hear it. If the car was off and you turned the key on it sounded like an electric fuel pump.
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Phil
The Great White Buffalo

USA
7223 Posts

Posted - 10 Aug 2017 :  8:53:39 PM  Show Profile  Reply with Quote
The OP mentioned running an OD Trans so the rear gear highway RPM's won't be an issue. Probably taller tires on that Bonne as well vs. what most of us are used to running so that'll complement the shorter gears too.

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 10 Aug 2017 8:54:42 PM
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