[HWYSTR455]

Originally Posted by STEELCITYFIREBIRD

http://www.cpgnation.com/forum/threa...justment.1937/

"Next, we’ll adjust the exhaust valves. To do so, you need to turn the engine over until the intake pushrod moves all the way up. Rotate just past maximum lift, where the intake will begin to close. The lifter is now at the base circle, and the exhaust valve can be adjusted. Note: DO NOT go too far down (over halfway) past the point of maximum lift. If you go too far, you will be in the overlap cycle – where intake valve lash is being taken up as the exhaust valve begins to open"

Anyhow, that's how I do them, solid or hydraulic lifters.


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Probably is fine, as long as it's after the full open, but pretty sure the overlap is somewhere at the beginning of the intake valve opening. Immediately after the closing of the intake valve is a compression stroke. My understanding is that the overlap is at the beginning of the intake valve opening. Like I said, I grabbed that info from comps' site, with the URL to the doc, but no sense beating this horse.

On the poly locks, you make the adjustment after you've reached zero preload as usual, such as a 1/2 turn, then back off like a 1/16-1/8 of a turn snug the set screw down, then crank back to the original position of the adjustment, hold the allen wrench and move both the wrench and allen wrench at the same time.

Some cam profiles slope the closing of a valve off slowly at the end, and can hold the valve open briefly at say .100-.200 lift, and that can be easily mistaken for the base circle of the lobe. That's why you use valve events to determine the base circle.

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