can I benefit from porting my lower Performer manifold?

[tmoss]

Tom, what kinda gains can be seen with port matching a lower to the head? I have a slight port mismatch with my R lower and heads but I think it may be due to the heads being milled a bit and the block being decked to 0.

Hard to say, some mismatch may not hurt much at all. How much are we talking about and on how many/which sides?

 

[tmoss]

I believe Tom allows you to send him a stitch of the heads and he can match them. Is their an extra cost to doing that?

If people have ported heads then I encourage them to make me a porting template - illustrated instructions are on my website under the download section.