What are the downsides of having too much seat pressure with a hydraulic cam?
Is 160#s too high for seat pressure running a hydraulic cam?
thanks

I don't know how much is too much, but I have always followed the 90-120 lbs seat pressure for hydraulic lifters. The open pressure is a concern too.

It depends on the type of hydraulic lifter. 160# on seat with a conventional hydraulic lifter is asking for problems.

If you are looking to run that kind of spring pressure on a cast cam, you had better look into the Shubeck style puck lifters. I am a dealer for them, they are now a great product when used as designed. If you would like any more information, please call or PM me.

Jeff Day
Precision Automotive Machine
Canton, Ohio
(330)456-3045

I have several motors with 150 to 175 lbs on the seats and 360 to 375 lbs over the nose with Comp Cams hydraulic lifters, I shift them at or above 6600 rpm at the track. Both motors work well and I have not seen any adverse effects from those pressures BTW, I do use around .012 to .015 lifter preload cold so

Coming from Cab, thats good info and good news IMO. As is JDPAM,s info in reguards to the shafts tortional cumalitives effects of extra spring pressure on a cast shaft. mike