PackardV8 wrote: ↑Sat Feb 04, 2023 12:34 pm
Hi, Mike,
I trust your recommendations, so trying to learn something here. I've been going to beehives whenever possible and have usually found about another 300-500 RPM over same seat pressure cylindrical. Why would we choose the old school cylindrical over the beehive?
The GM cam he's running is the same cam that's used in the GM 602 Crate engines, that are used in circle track racing all across the country.
With that PAC-1210X spring, those 602 crate engines turn 6,400 on a regular basis.
Our "Cheater" 602 Crate cams are more aggressive then the GM cam, and these springs are still stable at 6,400.
They take a stock retainer, which are readily available, and dirt cheap.
Installed at 1.700", they have 87# on the seat, and 220# at .460" lift. I don't know of a beehive spring that installs at 1.700, that would have less.
With that cam, and a 6,000rpm redline, he could even save some money and run the GM #19154761 springs that come in the 602 crate engine.
https://www.summitracing.com/parts/nal- ... 1#overview