Ported heads

LOWET · 09-05-2008, 09:00 AM

I have been thinking about installing new heads in my 05 GTO for a long time. I did not want to toss out the stockers because they do a dam good job of flowing air.
I made up my mind to Port my stockers and have my Typhoon intake ported at the same time. The car is in the shop now and it should make it on the dyno for tuning and testing today. I am not expecting a big gain but I think
15 -25 HP would be a good guess. What do you thing about porting a stock set of heads.

Rukee · 09-05-2008, 09:15 AM

I use to do a bit of porting and polishing and what I found with my customers was it increased top end alot, but low RPMs suffered from slow bottom end throttle response.
So performance increased but drive ability suffered slightly.

*Edit*
Thinking back those were all on carb`d units, perhaps a fuel injected unit would not experience that, or it may not be as bad.

LOWET · 09-05-2008, 01:28 PM

Quote:

Originally Posted by Rukee

I use to do a bit of porting and polishing and what I found with my customers was it increased top end alot, but low RPMs suffered from slow bottom end throttle response.
So performance increased but drive ability suffered slightly.

*Edit*
Thinking back those were all on carb`d units, perhaps a fuel injected unit would not experience that, or it may not be as bad.

I guess I will find out today . It will be on the dyno shortly

Car came out good . gained over 40 corrected RWHP compared to the last time it was on a dyno