valve springs
 

long time listener, first time caller, rebuilding 1980 sc 3.0 back to stock, I have a question on valve springs, purchased new set from pelican, and I am checking valve spring compression on install height, pressure obtained between 95-98, are these numbers in the ballpark for ft/lbs

The data I have, which is second hand from the internet, says stock seat pressure is 75lbs. 95-98 sounds more like the pressure for a race spring set.

-Andy

Agree with Andy on the 90-something seat pressure at installed height. EBS Racing VMAX springs spec 94 lbs when using their Ti retainers and 98 lbs when using stock steel retainers

thanks for info, springs purchased at pelican #901-105-901-52-m260, not racer type, if seat pressure is to high will this cause problems with stock cams?

Too much pressure wears the cam lobes.
Bruce

That's where engineering comes in...just enough pressur applied the the rocker so that it follows the cam profile at high RPM.
If the pressure is correct for the inertia of the valve/rocker/spring combo...and has a little excess to allow for slight over-rev...tehn it's the best it can be.
This is why lighter valves and rockers can contribute so much to the longevity of an engine.
Bob