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  #11  
Old 06-20-2018, 11:16 PM
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Yes, the sticker price on irt is over 10K and it has everything including cb and power antenna and ive not seen many black black w all blue graphics. ....i suppose i wouldnt mind using the original block and heads and intake and making it 400 plus hp from there
I will not hook up emissions there are 200 hoses under the hood. ! i dont want to use stock exhaust manifolds really ... plus i wont have to have an engine laying around for it if i redo the original ....what are best options on that? compression/rods/cam etc etc
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  #12  
Old 06-21-2018, 12:28 AM
fortim fortim is offline
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Good info in Steve's thread. For a Trans Am I agree, I would build a '71-72 455 HO, 9.5 to 1, runs on pump gas and cool as a cucumber.

Save the numbers engine for when you sell it.
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Old 06-21-2018, 12:32 AM
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If you go peruse this thread by BentwheelBob (who now owns and restored my black 455HO Formula) you can see what he did. He built a 461 stroker with 474hp/550 torque off the original 400 engine in his 78 T/A. Bob is a great guy and quite entertaining to read. And he had a set of modified 6X heads built for the project (similar to the heads that I used on my 455, from the original 350)

http://forums.maxperformanceinc.com/...d.php?t=755425

engine info here:
http://forums.maxperformanceinc.com/...d.php?t=755425
http://forums.maxperformanceinc.com/...755425&page=18

dyno results
http://forums.maxperformanceinc.com/...755425&page=39

Last edited by njsteve; 06-21-2018 at 12:57 AM.
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  #14  
Old 06-21-2018, 01:02 AM
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Majority of the 4.4.4. cars were basically full option loaded cars in the 10k range with 2 page window stickers.
However, in that respect - the CB and the Pwr Ant. are the 2 things you usually do not see on most of them. Unless they were Silver Tenth Anniversary Editions (TA/TA)

Have only seen 1 Blk/Blk/Blue Birds ... just in internet pictures ... and was maybe even this same car you have now. It was also low miles being offered by a classic car dealer a few years back.

You can buy what we call a "garden variety" 400 core engine pretty cheap usually. $200-500
1972-up Lemans/Grandprix/GTO/Bird base engine
That is what i would do.
And then buy the forged component stroker kit to have around 455cid and approx 450-500hp. 9.2 - 9.7 Comp Ratio

That platform would have less initial investment than the cost of a pair of aluminum heads by themselves.

Then a pair of repo Over-Size RamAir high flow cast iron exhaust manifolds (aka 70 T/A Ram3 units - with Larger than factory outlets) , and a full performance bolt-on exhaust system from PYPES made for those manifolds , with a transverse mounted muffler.
Clean easy install D-I-Y.

Have the heads and intake and exh mans - gasket matched.
Mild clean up and bowl blend on the heads.

Cliff on the carb
Cliff on distributor recalibration
Cliff on the heads and valve/seat cut specs
Cliff on the cam selection
Basically Cliff on everything as far as build parts and recommendations , maybe even assembly.

His build platforms have mostly all already been dyno proven on the HP targets. No guess work. And no confusion with 27 different cam suggestions from interwebbers.
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Old 06-21-2018, 01:09 AM
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The Gramma car was the test bed for the installation video of the new Pypes oversized manifolds and exhaust system. It definitely woke the car up. I can honestly say that the Gramma car will leave our '73 SD455 in the dust. I did a little comparison timed sprint of a local on-ramp. The SD455 would get to the end of the short ramp at 50 mph. Gramma hit the same spot at 70 mph.

angry engine sound video clip: https://www.youtube.com/watch?v=ptAubfuN8N4

install video: https://www.youtube.com/watch?v=6b9nQOYa4Hk

Last edited by njsteve; 06-21-2018 at 01:16 AM.
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  #16  
Old 06-21-2018, 01:14 AM
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Quote:
Originally Posted by fortim View Post
Save the numbers engine for when you sell it.

Excellent strategy and sound advice !

Quote:
Originally Posted by njsteve View Post
... 461 stroker with 474hp/550 torque.... Bob is a great guy and quite entertaining to read.
Bob Rocks !
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Old 06-21-2018, 01:28 AM
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Baron Von Zeppelin Baron Von Zeppelin is offline
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Just to get you fully prepped -
Open Shaker vs. Closed Shaker is 2 different worlds completely.

You'll want to find a substitute 77-80 shaker top to cut open - if yours isn't already cut open. I think they might even offer an electric "functional flapper" D-I-Y upgrade for these now ?
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  #18  
Old 06-21-2018, 01:32 AM
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Quote:
Originally Posted by Baron Von Zeppelin View Post
Just to get you fully prepped -
Open Shaker vs. Closed Shaker is 2 different worlds completely.

You'll want to find a substitute 77-80 shaker top to cut open - if yours isn't already cut open. I think they might even offer an electric "functional flapper" D-I-Y upgrade for these now ?
This is the guy who sells the parts: http://pontiactransamshakers.homestead.com/

I actually used original 70-72 parts for my project since they were easily locate-able in my basement. :-)
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  #19  
Old 06-21-2018, 03:22 AM
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Baron Von Zeppelin Baron Von Zeppelin is offline
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Man
we are Hooking this dude UP with the mojo stuff

We Rock !
lol
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  #20  
Old 06-21-2018, 04:46 AM
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Quote:
Originally Posted by Tracker1 View Post
P.S. The weak block Baron is referring to is the 500557 block used mid-1975 to 1977. Not a great block to build 400+ horses with. Avoid.
I have a 557 block that I was considering using and have done some extensive research. The conclusion was roughly this:
Do not take it past 6000rpm. Keep it below 450 hp if going to ~5500rpm. If sticking at a max of 4500-5000(low-grunt street engine; torque monster), there is a reasonable chance you could get 500+hp and it would live safely.
RPM is going to be the thing that causes the weaker 557 castings to slightly contort and that would then encourage the crankshaft to fail.
I would say for anything around 400hp, a 557 block would make a fantastic replacement motor so you can preserve the original block. Thankfully they are relatively common.


Have fun with the build!
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