CLASS RACER FORUM - View Single Post

Dave1695 · 11-18-2011, 01:24 PM

The engine is .040 over 350, 10.5 comp. 750 dbl pump on victor jr, car weight 3100. running in IHRA Crate Motor class. Trap RPM 7200. I have always thought the pipe at head should be approx. the same size as exhaust valve but have gotten some opinions that the larger 1 3/4 inch pipe at head works better. The 4-2-1 collector is pricey but have heard well worth the investment. Thanks for your input gentleman.

11-18-2011, 01:24 PM	#4
Dave1695 Member Join Date: May 2009 Posts: 160 Likes: 0 Liked 15 Times in 11 Posts	Re: header tube size The engine is .040 over 350, 10.5 comp. 750 dbl pump on victor jr, car weight 3100. running in IHRA Crate Motor class. Trap RPM 7200. I have always thought the pipe at head should be approx. the same size as exhaust valve but have gotten some opinions that the larger 1 3/4 inch pipe at head works better. The 4-2-1 collector is pricey but have heard well worth the investment. Thanks for your input gentleman.