how much is too much off the head

[boosted1stgen]

Pulled cylinder head off today in search of odd knocking, which turned out to be piston slap. Anyways while cleaning mating surface i realized how much material the machine shop took off last time it was there because it was warped. Is this head still usuable?

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[SaulHudson]

The teardrop is irrelevant as it can be fixed with a rotary file. The real issue is the service limit thickness of the head. Measure the head.

 

[boosted1stgen]

The teardrop is irrelevant as it can be fixed with a rotary file. The real issue is the service limit thickness of the head. Measure the head.

So i measured the thickness of the head, the micrometer i was using doesnt have the longest jaws. I was able toget readings of right around 5.160. So i guess that explains why i could never get the the pointer on the crank for timing perfectly lined up when cams were even though cylinder was at tdc. How much would rhat raise my compression

 

[pacn91]

If im not mistaken about 1 point...rule of thumb was every .040 raises compression 1 point. Something i learned and used in my roundy round days.

Check out what bogus has covered...in case you havent already

http://www.dsmtuners.com/threads/how-to-measure-a-4g63-for-cylinder-head-for-thickness.413757/

 

[Talyn]

I'ts a bit late for this now, but the correct thing to do is to take the combined measurement of material milled off the cylinder head and block when doing a rebuild, and to check that against the factory spec for machining allowance, if out of spec, you try to find a HG of different thickness to bring it back into spec.