Just curious if you decided to port your cast iron LS manifolds, why and did you do it yourself or have someone do it for you? Did you remove a lot of material, or just a polish? Any proven gains?

For the record, I did not port mine. Didn't see any need in it. But willing to listen to your advice and your experience!

 

DO NOT do this. i was grinding on my manifold just to make a little room between it and my corresponding hot pipe and i did this after about 15 sec of light grinding. i figure the metal is about 1/16th of an inch thick in some places.

 

Nice one! Kinda why I never bothered to do mine. Figured what was the point? Thanks, hairynuts32?.......

 

I remember back in like 2000, a company called LS1Motorsports would build turbo kits and port the manifolds. I'm not sure how much material they took off. The main thing when porting something is not to necessarily make it bigger, but to smooth it out. Remove imperfections in the castings that'll effect flow, bottle necks, etc.