GRAND PRIX Pontiac V8 flywheel removal

Bonnewagon

Bonnewagon

Geezer
Sep 18, 2009
6,389
113
Queens, NY
I read the Performer was just an aluminum version equivalent to the stock Pontiac cast iron manifold. The Performer RPM was a tiny bit better but at a clearance cost. FWIW independent testing by Jim Hand and others has determined that the stock Pontiac cast iron unit was just about perfect for a Pontiac motor and even the Pontiac SD/RA aluminum versions were not a whole lot better. If you are not going balls out racing I would stick to a stock Pontiac or the Performer. http://silverstatepontiacs.com/jharticles/jharticles14.html
 
TURNA

TURNA

Geezer
Jul 24, 2009
9,126
113
Socialist NY
I dream of that.. but was trying to save that conversation for the body shop when the time comes.

If you are debating that intake

THE TIME IS NOW!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
 
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78GP400

78GP400

Apprentice
Mar 2, 2017
64
33
Hartville, Ohio
Use it and put a TA shaker on it
Do it! I love mine!
Seriously, I couldn’t fit a Performer on mine with the 400 engine. I couldn’t close the hood without removing the insulation and going to a really low profile ,dropped base air cleaner that was literally robbing me 61 horsepower on the dyno!
That was the main reason, besides the looks, that I did a shaker conversion.
If you want to stay with the stock hood you could also go to a TorkerII manifold instead of a Performer you will gain about an inch and a half of clearance. I’m sure you could find someone to swap you manifolds if that is the direction you want to go.
 
84GP455

84GP455

G-Body Guru
Jun 19, 2007
783
28
Methuen Ma.
I have a regular Edelbrock Perfomer not the RPM manifold on my 455 in my 84 GP with a drop base air cleaner and a 4" element with no clearance problems. You have to make sure that you are using the motor mounts for the 301ci motor because they are a lot shallower than the 400 or 455 ones. And also for a few years I had the motor mounts bolted on the wrong locations on the frame which put the motor forward and up a little higher than it should be. There are multiple holes on the frame due to the many different engines that the GP's offered, like the V6 231, Pontiac 301, Chevy 305 and the diesel engines also. So it is possible to find holes that will fit the motor mounts but are not necessarily the right ones to use. When I had to change a broken motor mount I realized this and found holes that sat back further in the frame and were lower, the result was my motor sat back further and lower than it did when i dropped the motor in the first time. And if i remeber correctly, I only used 3 out of the 4 holes for the motor mounts, one corner of the mounts goes off the frame just a little bit.
 
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tdvick

tdvick

Master Mechanic
Jun 25, 2010
308
28
Elk River, Mn.
The factory locations from my ‘80 Lemans 301.
 

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TURNA

TURNA

Geezer
Jul 24, 2009
9,126
113
Socialist NY
no
 

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