EPO89 Ummm, Headers and Fuel

Welcome to our show Unsealed: Life Beyond the Bolts! Each week, Kate Dillon from Crate Insider and Steve Hendren from Hendren Racing Engines go live on the Crate Insider Facebook page to chat about world events, random things, and to answer tech questions.

Kate and Steve recap their week of working in the motorsport industry and answer some great tech questions. This week’s show is focused on headers, regarding torque and horsepower. They also dive into what fuel works best for different applications.


what carburetors do u recommend?
Are Pro Fab headers worth the $$ over other brands like Beyea, Dynatech, Schoenfeld . Steve, can you give some examples of Dyno numbers difference based on different brand headers?
Iv been reading trying to understand what the power valve does. Iv had 4.5 and 6.5 sizes. Just can’t understand what they do and what size to run?
Reversion mufflers? Worth the money?
I have a 604 with fastrak seals what would be involved in getting crate usa seals installed on engine would I have to have built again?
What’s the difference in the 603 versus the 604 crate motor?
How important is consistency in Reid Vapor Pressure of race fuel?
What fuel would you recommend for a 602, 91 or vp105. Thoughts on mixing?
How many regular sat night shows would you put on a 604 before freshen?
Running a crate 602 with a hp650 on a half mile dirt track. What thickness spacer do you recommend?
What 604 spacer do you recommend? 1” or 5/8? Open vs 4 hole?
What kind of difference would it be to switch from 14 pound flywheel and 14 pound clutch setup to a brinn style trans? 602 crate