minimum ptv clearance ?

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May 10, 2012 | 03:18 PM

ksk1980

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From: Gretna, VA

minimum ptv clearance ?

Whats the minimum ptv clearance on intake and exhaust side. Running 243's milled .010 on a 6.0 bored it .040 with flat tops. Cams a 224/230 .609/.604 on a 112 lsa intake cl 108. Running 7.4 pushrods. Machinst says for his calc. With deck heigth as is pistons protrude just a little bit no more than. 020. Wanna run stock gaskets with bore diameter of 4.100 and a thickness of .041 .any issues n that stand out b4 i order gaskets? They also come in .053 thickness. Im gonna clay and check but wanna have gaskets on hand so if all is well i can go ahead rite then and bolt heads on .
Thanks

May 10, 2012 | 04:43 PM

redtail2426

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the rule of thumb is .080 on the intake and .100 to .110 on the exhaust.Although some have run .050 to .060 on intake and not had issues,that we know of.

May 10, 2012 | 09:17 PM

427 zeo6

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I wouldn't hit up any autocross races with under 0.100ptv clearances. Might be able to survive at the drag strip but, won't survive on/off throttle applications.

May 10, 2012 | 09:44 PM

ksk1980

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Cars purely for street. Daily driver if need be.

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