Are cometic head gaskets for a 426 ( 5 layer )installed as is ? No spray sealers or silicone in any common leak areas?
Cometic head gaskets
- Thread starter dan juhasz
- Start date
6PKRTSE
Well-Known Member
I install dry. I only use spray sealer when re-using them. Also make sure to have the correct deck finish surface of 50 RA (roughness average) or finer, is recommended for a proper gasket seal. Anything rougher may conflict with the gasket design.
I did read online but wanted additional feedback from members that have used them. Can never have to much actual user info.
Block has never been decked. Is the factory surface adequate?
Probably not correct. The factory decks were quite rough.
BSB67
Well-Known Member
Nope.
j-c-c-62
Well-Known Member
Is there a suggested upper CR on Cometic head gaskets?
MCODECUDA
Well-Known Member
None. I’m running a 10.6 and they can handle a lot more than that.
They're the last step before copper
j-c-c-62
Well-Known Member
13.5?
Copper requires an O ring?
Copper requires an O ring?
16:1? Whatever the max is I guess.
Make sre the block and heads clear the rivets. If not a little clearance grind will fix it. I've used them dry. Reused them with copper spray up to 3 times. This was at 15-1 compresiion. Surface of the head and block should be very smooth.
Cometic Gasket - Sealed Under Extreme Pressure.
Doug
Cometic Gasket - Sealed Under Extreme Pressure.
Doug
not so famous bob
Well-Known Member
wrong if true cometic , they said (back when I built my 505), to install dry !!
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