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14reamdalton
Tribal Scout

USA
2 Posts

Posted - 17 Nov 2017 :  11:58:38 AM  Show Profile  Reply with Quote
Hi guys, I'm fairly new to the Pontiac market but have loved them for quite a while now. I recently came across 3 Pontiac 455's. We scrapped one because we felt it was beyond repair but looking back should have kept it for the block. The other two are going to be built by my brother and myself. He is looking to build his streetable yet powerful to around 400 or 500 horse.

I'm getting more greedy on the other hand, looking to build a 700 to 800 horse motor using an 8-71 blower setup. I'm looking for a large amount of torque, horsepower, and streetability as it will be mounted in a 1980 chevy k20 with an nv4500 5 speed and np205 transfer case behind it. I've been doing research for the past few months and plan to start building the engine sometime next winter after much much more research. Correct me if I'm crazy but I am looking to use mostly top-of-the-line products because I want this engine to last a few ten-thousand miles on the road both as a trailer hauler and a Sunday cruiser, and doing so plan to spend anywhere from 10-20 thousand on the build .

I have been researching how to make the block stronger by adding 4-bolt main caps, using filler up the the freeze plug holes, and lifter bore braces. keeping it cool with blower intercooler fron The Blower Shop, electric water pump, larger radiator, finned pans or covers where necessary... My main areas of confusion would be the valvetrain setup, cam size, cylinder head size. I want to bore the block out a little but would this compromise the blower's effects?

Any pointers or opinions would be greatly appreciated for this project, as I want to do it right the first time with minimal issues down the road.

Thanks,

Dalton

Edited by - 14reamdalton on 17 Nov 2017 12:10:49 PM

cortcomp
Coyote

USA
5354 Posts

Posted - 17 Nov 2017 :  12:59:16 PM  Show Profile  Visit cortcomp's Homepage  Reply with Quote
I would talk to any of the known pontiac builders; they could hit 800hp with that budget and no blower no problem.
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tjs44
Cochise

USA
422 Posts

Posted - 17 Nov 2017 :  2:57:34 PM  Show Profile  Reply with Quote
With the HP level your looking for you should look at a aftermarket block.All the up grades your talking about are expensive and really just a band aid as you approach 700HP level.Spend it once and spend it right the first time.JMO,Tom
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Steve C.
Crazy Horse

1691 Posts

Posted - 17 Nov 2017 :  7:31:06 PM  Show Profile  Reply with Quote
With the HP level your looking for you should look at a aftermarket block.All the up grades your talking about are expensive and really just a band aid as you approach 700HP level.Spend it once and spend it right the first time.

X2
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Blued and Painted
Chief PONTIAC

USA
3415 Posts

Posted - 18 Nov 2017 :  10:50:23 AM  Show Profile  Reply with Quote
X3 aftermarket block

https://butlerperformance.com



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

Edited by - Blued and Painted on 18 Nov 2017 11:04:30 AM
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14reamdalton
Tribal Scout

USA
2 Posts

Posted - 18 Nov 2017 :  11:31:28 AM  Show Profile  Reply with Quote
Okay thanks guys! So should I just keep the old block and build something smaller with it? Or are those blocks not very strong to begin with?

And should i still use block filler on an aftermarket? I know the lifter valley is solid so I won't need the braces

Edited by - 14reamdalton on 18 Nov 2017 11:44:06 AM
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Steve C.
Crazy Horse

1691 Posts

Posted - 18 Nov 2017 :  2:43:04 PM  Show Profile  Reply with Quote
You will not need to fill the IA2 aftermarket block.

.
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Blued and Painted
Chief PONTIAC

USA
3415 Posts

Posted - 19 Nov 2017 :  11:24:35 AM  Show Profile  Reply with Quote
If not cracked, .060 or more over bore, or signed of a smoked main or cam journal , the they are probably buildable and worth good money.


Bull Nose Formula/ 461/ Q-Jet/
TH400/ 3.08 8.5 / R44TS.
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Steve C.
Crazy Horse

1691 Posts

Posted - 19 Nov 2017 :  2:12:18 PM  Show Profile  Reply with Quote
My opinion, if it were a large journal block I'd have it sonic checked before trying to go with a large bore. Not so much with a small journal block.

I've run both blocks in my car with seven different engine combinations. Some approaching 600 hp, some over 600 hp and one at 700+ hp. No issues because proper precautions were taken, some would express they were only with expensive modifications. But if you want to dance you have to pay the piper :)

That said, you can always run into issues and I did. I cracked my numbers matching block many years ago at the 600+ hp level. It can be a crap shoot !

.

Edited by - Steve C. on 19 Nov 2017 2:13:10 PM
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