It depends on the RPM, and the weight of the valves.skinny z wrote: ↑Fri Oct 15, 2021 4:30 pmThanks for that Mike.
I can see it's a question of risk (being longevity) vs reward (more power!).
I suppose the question I have to ask myself is how much risk am I willing to take. I'm at a point where I probably won't rack up the mileage that I used to but that said this IS going to be driver. I have to get to the Nevada road race somehow. That's 1500 miles one way.
I'm basically at square one on the valve train again having lost a link bar , spinning a lifter and wiping out the cam. So new cam and lifters at a minimum.
Specifically to you CamKing, your EHR73360 lobe (duration at 284/238 and lift at .575 with 1.6 rockers is about ideal) would require what kind of spring pressures? I'm currently set up with COMPs 26918 conical spring and tool steel retainers.
Specs are:
1.800"/125 Lbs
372 lbs./in.
Is that sufficient for that lobe?
And if may ask, which of your lifters would you recommend for a retrofit Gen 1 SBC using that lobe?
Are any of those a reduced base circle?
Thanks again.
For that profile up to 6,000rpm, we normally use a PAC 1218X, 140# on the seat, and 330# at max lift.
For what you are doing, you may be better off going to a mechanical roller cam, designed for endurance. That way, you can make sure you have enough spring pressure to control the valve train in the unlikely chance you over-rev the engine, without having to worry about how the added spring pressure effects the hydraulic unit on the lifters.