PTV clearence help
05-14-2009, 08:08 PM
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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
05-14-2009, 08:24 PM
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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.
05-14-2009, 09:18 PM
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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.
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05-14-2009, 09:22 PM
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why not just run that setup with MLS gm gaskets and flycutt for both valves??either that or clay it. either way i would check. ur college budget my fly right out the window when it needs a new motor. either that or go with a smaller cam 
