Cam&Lifter& valvelash?

[Dissident]

Setting valve lash with a "feeler" gage can easily be all over the map when it comes to accuracy. Depending on valve train deflection, a racer might want to more precisely set the valve lash with either an old P&G valve gapper or one of the more recent pieces from Precision Measurement Supply in San Antonio.
Regards,
Dissident
Hope the pics attached ok.

[MikeMoller]

Wondering about the loss of lift running solid lifter. If you have to run lash but the cam is checked at zero lash by NHRA then you would have to lose some lift using solids. Question is, do you lose lift with a hydraulic lifter at zero lash or with some preload, and how much? Then is a solid lifter really the way to go?

[Billy Nees]

You not only lose lift. You lose duration too, and more than you would think.

[Pat6868]

Treated cam, tool steel hydraulics plugged at .008, lash them where you like.

[Alan Nyhus]

Originally Posted by MikeMoller

Wondering about the loss of lift running solid lifter. If you have to run lash but the cam is checked at zero lash by NHRA then you would have to lose some lift using solids.

Yep. Keeping as much lift and duration as you can is the key. Very tight valve lash addresses this. That's not a blanket recommendation, just a mechanical fact.

Originally Posted by MikeMoller

Question is, do you lose lift with a hydraulic lifter at zero lash or with some preload, and how much?

Even with a true hydraulic lifter full of oil, there will be some amount of push rod cup movement (down) as it acts against the valve spring. How much is the question and depends on a lot of things.

Originally Posted by MikeMoller

Then is a solid lifter really the way to go?

Maybe. Maybe not.

Good discussion. -Al

[GTX JOHN]

I absolutely agree with both Derek and Alan.

MY boy will be testing the solids in his combo.....I will let you know
how it ends up!