99SS#20

iTrader: (13)

I have done some searching and found people split on Cometic gaskets. When I checked Felpro and TFS both make a MLS gasket like the Cometic. Are these gaskets as particular about finish as the Cometic MLS? I was hoping for a thinner than stock gasket for a compression bump, but I'm only changing heads, so I'm worried about the block surface.

69LT1Bird

iTrader: (1)

For the price difference between Cometics and stock GM gaskets, it maybe cheaper to have the heads milled to achieve the same thing. Around here is costs about $75 for the pair to have them milled.

99SS#20

iTrader: (13)

Very good idea, thanks for the info!

357i

iTrader: (4)

Thats what I did, $90 to cut the heads and I just bought a GM head gasket/bolt kit from LPE

helicoil

iTrader: (104)

The Felpro 1041 is a composite gasket that works fine for NA, with even a little power adder, (up to 150 shot) measuring .041" thick compressed. It is not as finicky as a MLS gasket either for surface finish. The price ain't too bad either.

transam69230

iTrader: (49)

If you use a composite gasket, and you change your heads be prepared for some major cleaning of the deck surface. MLS are a much better choice IMO as they require less clean up if you have to remove them.

99SS#20

iTrader: (13)

I was planning on running a 150-200 shot. I don't mind doing prep work, just don't want to pull the motor to have to mill the surfaces.

LSxPwrDZ

iTrader: (4)

I'm going with LS3 gaskets on my 403.. they are .051" 5-layer MLS... they are supposed to hold up better than the LS2 3-layer gaskets do (not saying the LS2 gaskets are weak cause they arent!!)

helicoil

iTrader: (104)

Only if they are 'graphite', not composite. Two totally different non-MLS gaskets. Graphite was OE on older LS1's, GM never used composite head gaskets on these engines.

transam69230

iTrader: (49)

Learn something new everyday!