I have two different LT1 manifolds,

1. 10108630 - symetrical ports

2. 12552138 - non symetrical ports

Both are legal for Stock Eliminator and both have performed pretty well on two different motors with the same head part number. Which intake is better? I am looking for small gains of any kind.
Any help that can be offerred in this matter is much appreciated. I am running out of time to play with stuff as the season is about to begin.

Thanks,

Daren

 

I would go to the flow bench and see which one flows better on your heads. Since you are in Stock Elim, I would flow every port with the intake bolted on to it. Then find the average flow of them, and use the best results.

Bret