Just wondering what kind of gains you guys are getting from porting out the TPI system. I'm doing it no matter what just because I have nothing better to do, but i was just wondering what to expect.

 

if you have a LO3, expect nothing. You have to have a moded 350 before you really see a difference

 

I dont know - but ill say this:
Youre going to see substantial gains if you decide to take it two steps further after porting/polishing and get a heads/cam set.
I dont have any experience with how much gains stock youll get with the porting, but for sure the more aggressive heads and cam will eat up the extra air.

 

oh yeah - be sure to get an adjustable fuel pressure regulator to up your fuel along with the higher demand of the engine.

 

It's actually going on a L98 I'm building. Where is the plenum and runners on an L03 to port out? . I'm putting a cam in it as of now....heads are later, when money allows.

 

Are you planning on Siameseing, or just Gasket matching and radiusing the Runner/plenum Junction ?

 

I already have the upper plenum opened up and siamesed. I'm using the SLP runners, so I guess i should go ahead and siamese the lower manifold and make it all worth while.