I've had my HSR/ZZ4 combo for a while now, but it is time to upgrade the heads/cam and all the things that go along with that. I just ordered a set of heads from Port Pros Competition Cylinder Heads and Racing Engines and they typically flow about 310cfm @ .600. Cam will be Comp 280XFI 230/236 .594/.588 (with 1.65 ratio Hi-Tech Stainless rocker arms) 113 LSA. According to stealthram.com the HSR flows 275cfm, but "can reach 300cfm with minor porting". My question goes out to anyone who has experience with porting this intake: I want to know how much time, money, porting it takes to see 300-310cfm flow from this manifold.

 

I think I answered this question for you on stealthram....if I didn't.....let me know.

 

You sure did on stealthram.com, thanks. I remember someone else didn't think it was possible though.