[58cheaptin]

Hi,

I'm building a Pontiac 370ci and am going to put a stock tri-power unit on it. My machine shop guy mentioned that the stock intakes don't allow for much volume for air/fuel flow, so he suggested maybe adding 1" spacers under the carbs. I'm curious if anyone on here has done that before and what the results were. Any information is appreciated!

Thanks!

Jim

[blueghoast]

I'm doing the same with a 347 motor 57-pontiac.
I was thinking about the spacers to as I'm sure it would help.
Might lose a little low end but I don't believe it would be that
noticeable. I know others have done it with later tri-powers
on 389's+400's with success the only diff is the cubic inch.
Maybe someone else has tried it on these older motors
and will give there results.

GT.

[b-man]

Leave it as the factory built it, it will run fine.

Seriously, when was the last time any of us have seen tall spacers used on a Tri-Power? I've seen dozens of setups and the most you'll see is 1/4" phenolic spacers for the sole purpose of insulating the carbs from manifold heat to prevent fuel percolation.

[pfilean]

Are you really going to race it? Will it really make that much difference? Or is the machine shop just stroking their ego in building race engines?

[Jack Gifford]

The main limitation of the early Tri-Powers is the extremely "low rise" manifold- fuel just can't stay in suspension through all those twists and turns!
If I were seriously interested in making power with one, I'd convert the carbs to throttle bodies, hide EFI nozzles in the bottoms the manifold's runners, and hide the EFI controller somewhere.