Hyd Valve
“Low Lash” solid roller cam for turbocharged SBF, what spring pressure to run?
We run a turbocharged, small block equipped Mustang that is set up to drive on the street a little bit and race a lot. It made a tad over 1000hp last year with a small hyd. roller cam. This year we’re going to a solid roller cam, but it’s a “low lash” roller, supposedly streetable, with .010 hot lash. The cam grinder has recommended valve spring pressure in the 180 range on the seat and around 450 or so open. Everyone I talk to says I should be running at least 250 on seat and 600 open (with a solid roller and 25psi of boost). Anyone have any thoughts on this? This is a big difference in spring pressure, and big difference in the cost associated with other components which I feel are necessary with 600psi open, like shaft rockers and large diameter pushrods. Please advise.
“The cam grinder has recommended valve spring pressure in the 180 range on the seat and around 450 or so open. ”
I would call the manufacturer of the cam. Tell them exactly what kind of setup you have, and the specs of the cam, and they can clue you in on what springs to run. You don’t want to play guessing games and float a valve, or bind a spring.
Hydraulic Valve Lifter
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