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Old 01-22-2011, 07:07 PM
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Checking pushrod length with checking springs?

I'm just thinking ahead in my 383 build to the next task, which is checking valvetrain geometry. On my last engine, I did this with a fully-assembled head using the final springs and had no problem creating a witness mark on the valve tip using a black Sharpie. However, this time around, I've invested in some checking springs (primarily to easily check piston-to-valve clearance) and would like to also use these for checking for proper pushrod length. The problem is the checking springs don't appear to be strong enough to effect a witness mark on the valve tip when the rocker presses down on the valve. I'd thought about using some engineer's blue instead of a Sharpie, but I'm not convinced this would be any better? I had also thought about using the center spring of my Comp 981-16 springs insead of the checking springs? I don't especially want to use the full and final valve springs because I'm paranoid about wiping moly off the cam lobes when rotating the engine over and over to make all the required measurements. I figure lightweight springs will exert less pressure on the lifter and will, therefore, result in less lube being wiped-off the lobes.

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Old 01-22-2011, 07:20 PM
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Light springs/heavy springs, if there's enough pressure on the lobe to keep the lifter planted, you're going to wipe it the same. Repetitions will wipe it more with each passover.

Just don't 'final install' the cam until all your checking is done.
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