LS1 Milled 243s MS3 PTV Issues
Definitely need to flycut that. I would not expect a set of LS6 heads milled .035 with a .041 gasket and a stock piston to clear. If it does, it does not have enough to remain safe.
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Stock bottom end Ls1, 243 Milled .035, Cometic MLS .041, MS3 at 113. Checked PTV several times and the clay looks like the valves are CLOSED when it hits. Had a friend come over and double double check with the same results. Is this normal or are we doing something wrong? Any help is much appreciated.
To properly clay the pistons, you need to use checking springs, or a modified solid lifter. Either one will get you what you want. But I find checking springs to be cheaper and easier. You can buy the springs you need at pretty much any hardware store. But they look something like this:
I have 8 springs, so I can do one head at a time. Overkill, I know. But it makes me feel better to check each one.
Put a 1/4" layer of clay on the piston, and bolt the head on using the old gasket. Doesn't need to be torqued all the way, just kinda tight. Turn the engine over a few times.
After removing the head, use a razor blade to carefully slice the clay. I cut about 1/4" slices. Measure at the narrowest part.
Sry for the confusion. Again, I say the piston is not hitting the closed valves. I have enough clay in the whole THE CLAY HITS THE CLOSED VALVES and that is the impression it leaves on the clay.
Something is missing then. Take a picture of exactly what you are doing and I'm betting it can be figured out.
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POWERBOND - ASP - AND MORE!
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COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
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TECH Fanatic
Joined: Jun 2011
Posts: 1,343
Likes: 8
From: Katy, TX
Well, are you turning it over so the valves open too?
If you put enough clay in there, of course it's going to touch the head, but that won't tell you anything until the valve opens and leave its impression.
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Verdad Gallardo Well, that's never going to work. Only put about 1/4-1/2" of clay on the piston top and try it again.
