PREDATOR-Z

You need to flycut for that type combo. MS3 cannot accept any mill on heads with stock bottom.

Sales2@Texas-speed

iTrader: (5)

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.

LSX_240

iTrader: (4)

Thats why I was checking ,to see how much exactly to cut. Should i just cut X amount or measure and do exactly what i need?

.boB

iTrader: (1)

That is a physical impossibility. It just can't happen. The pistons are flat, and the chamber is a bowl. The chamber is not round, and smaller than the diameter of the piston. There's no way the piston can extend into the chamber enough to hit a closed valve.

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.

LSX_240

iTrader: (4)

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.

Sales2@Texas-speed

iTrader: (5)

Something is missing then. Take a picture of exactly what you are doing and I'm betting it can be figured out.

RezinTexas

this writeup may help you.

http://www.scribd.com/doc/137049285/...RAFT-20-Apr-13

sepsis

iTrader: (7)

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.

PREDATOR-Z

Ptv clearance is usually measured 10 degrees Btdc to 10 degrees Atdc. That is where contact usually occurs.

.boB

iTrader: (1)

Well, that's never going to work. Only put about 1/4-1/2" of clay on the piston top and try it again.