How close can you be on p2v?

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Jun 11, 2011 | 12:08 PM

1gt2nv

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How close can you be on p2v?

A friend and I built a ls2 for another friend. The guy bought all the parts he needed and we put the engine together. We clayed it and the gm head gasket made the difference. With out the gasket, the pistons would hit. The owner didn't want to fly cut either. Is he safe? I wouldn't think so, but I'm no pro at this. lol

Jun 11, 2011 | 02:04 PM

Firehawk441

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GM head gasket is .051" compressed. Although there are various opinions on "minimum" PTV clearances, Good luck finding anyone to agree with .051"

Jun 11, 2011 | 02:24 PM

Doug G

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.050 ???????? ouch

Then again.... it could live a long time ???

Buddy of mine had a 12.5-13:1 388. When we pulled the heads for some porting 7 of 8 cylinders had witness marks on the piston from the intake valves.

Jun 11, 2011 | 02:56 PM

Jimbo1367

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A friend told me .100 exh and about .080 intake. Who knows if hes even closethough .

Jun 11, 2011 | 03:27 PM

Samer

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Quote:

Originally Posted by Jimbo1367

A friend told me .100 exh and about .080 intake. Who knows if hes even closethough .

Yes, those are the safe PTV clearance boundries but swap the intake and exhaust numbers.

Jun 11, 2011 | 05:03 PM

427

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Try and clay it with the gasket in place, it will change more than the gasket thickness. I would not run below .090 on ex and .050 on intake with auto trans. Add .020 for stickshift.

Kurt

Jun 11, 2011 | 05:09 PM