? about that 3.65” crank

I've talked to a few guys who, right or wrong, tell me the R5P7 engines are not as popular in door slammer type drag cars because they make tons of power up high but suffer on power down low. In a NASCAR race no one needs low end because they don't spend much time under 6000RPM , but in a 3000lbs drag car what happens from 3000RPM and up matters more

When I read this, it says what I said above. Many guys talk about RPM and doing it, but very few do it. BTDT.

Also, RPM doesn’t always mean a “weaker” combustion cycle. Cylinder head cross section, induction, cam timing, compression ratio all go together to make RPM and make power. I can tell you from experience that any 4 inch crank (as an example of more what we see here) is criminally under headed for much over 5500-5800 unless the cam timing is pretty aggressive. A shorter stroke with the same cylinder head will make more power at a higher RPM an be quicker. Every time. Again, IF you plan for it.

If you are dealing with someone who thinks a 3500 converter is all they can handle and a 3.90 gear is the limit then RPM isn’t for them. Add some stroke and live with it. I’ll take RPM every single time.