PTV clearence help

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May 14, 2009 | 08:08 PM

Gregorya24

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PTV clearence help

I have some 241 heads milled to 59cc and a 232/237 613/613 on a 112lsa, i was wondering if im gonna have ptv problems on a stock ls1 rotating assembly im also using stock gm head gaskets. Thanks Greg

May 14, 2009 | 08:24 PM

vettett15

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I'd say that is a pretty sure bet for your pistons to high five your intake valve. I run tsp stage 1 ls6 heads milled to 59cc on a 228/232 cam 113+4 and it is close. Those heads have the valves set back in them i believe.

May 14, 2009 | 08:27 PM

brad8266

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If it clears it will be very close. Measure before you assemble it.

May 14, 2009 | 08:28 PM

Gregorya24

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Quote:

Originally Posted by brad8266

If it clears it will be very close. Measure before you assemble it.

would yall recommend going to a thick head gasket? anyone know what the cr would be?

May 14, 2009 | 08:30 PM

brad8266

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Quote:

Originally Posted by Gregorya24

would yall recommend going to a thick head gasket? anyone know what the cr would be?

Id rather have a smaller head gasket for tighter quench area.

May 14, 2009 | 08:32 PM

Gregorya24

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Quote:

Originally Posted by brad8266

Id rather have a smaller head gasket for tighter quench area.

understandable i was plannin on going forged but college budget im just trying to get the car running again, any other imputes guys would be greatly appreciated!

May 14, 2009 | 09:18 PM

vsocks1

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You need to actually measure PTV and I would bet you are in trouble. I have TFS 215's milled to 60cc with a 232/236 .595/.578 113+3 cam and I had 0.040 clearance on intake valve at 11 *ATDC with GM MLS gasket. Many would have just run that setup but we decided to check...good thing! Ended up flycutting my pistons 0.090 on intake so I could run a Cometic .040 gasket to gain compression lost from flycutting and better quench.