SPANKY LS1

iTrader: (24)

If I were to use set of 205 AFRs (66cc) and a 224/228 .581 114lsa camshaft, how much could I mill and be safe as far as P to V clearance, assuming a GM MLS gasket? .020? .030?

Thanks, Shawn

gomer

iTrader: (13)

The ICL on the cam will come into play on the P/V clearance.

ArKay99

iTrader: (1)

Shawn, we just did this on a 2000 C5 FRC. We measured the pistons out the hole to be .004" - .005". We used a Cometic .040" mls gasket that put our quench distance at .036"-.035". The cam is a 224/228 .581"/.588" on XE-R lobes. LSA is 114 with an ICL at 113 on the cam. The installed ICL was 111. The heads were milled to .024". The measured p/v on this motor is .094" intake and .125" exhaust. You could go for this setup but guaranteed your p/v will be different. How much? Not known unless you measure it. If you go off a tooth it would be significant. If you are dot to dot it would be different based on the installed ICL, the deck height, valve height, head gasket thickness, etc. If you are going with a thinner gasket you must measure your deck height so you know what your quench distance is.
Measure twice, cut once...

SPANKY LS1

iTrader: (24)

Here is my crude math, and taking into account the following quote:
Ok, MLS gasket is ~.054 thick IIRC. So, using the above car as a guide, I would have ~.015 more P to V clearance just from the gasket thickness difference, which would put me at ~.109/.140 clearance assuming the heads are milled .024. So, hypotecially, if I were to go .030 or .040 even, I would still have plenty of clearance. [Disclaimer: I know I can't judge my setup working based on anothers measurements, but it is a rough guesstimate]

Shawn

Slowhawk

iTrader: (12)

The speed of the Cam ramps make a difference too.

SPANKY LS1

iTrader: (24)

I'm 99% sure it is an XE-R lobe, for whatever thats worth.

Thanks, Shawn