[Fot] Best Head Gasket

[Tony Drews]

If you want one that is tolerant of imperfect block / head / liner 
protrusion,

Cometic part numberH0793SP4059F has worked best for me.

Payen AE-330 composite used to be my go-to, but they changed hands and I 
changed liners and that didn't work for me anymore.

This is an 0.059" thick, 91 mm bore gasket with round fire rings, but 
you need 91 mm bore even if your liners are smaller than that (mine are) 
due to the diameter of the hole in the head if you've milled ANYTHING 
off of it and opened up the intake pocket.  They make a thinner gasket 
and a 88 mm one, but the 88mm fire ring outer edge is inside the intake 
pocket on my head which has only been milled, no additional intake 
pocket relief ground.  Even at 91mm I have a little bit of the fire ring 
protruding into the combustion chamber.  I've not had it burn through - 
but the longest it stays on the engine is maybe a dozen races.

If you have perfect block / head / liner protrusion, one of the solid 
gaskets (either steel shim or one of Mordy's awesome copper gaskets - 
gasketworks.com) will give you a bit more compression and you can make 
sure none of it protrudes into the combustion chamber.  We tried various 
solid gaskets on Jack's engines and always ended up blowing a head 
gasket and changing to a Payen AE-330 at the track.  We eventually just 
put the composite gasket in to begin with and stopped having to do 
that.  We got pretty good at it though - I think we had it down to about 
1.5 hours.

Regards, Tony Drews

On 7/31/2020 4:27 PM, mleccese1--- via Fot wrote:
> Phil, Dave,
>
> I may have compromised my head gasket last weekend at Lime Rock (Green 
> TR4 #802), can you or someone recommend one that is robust.
>
> Thank you
> Michael L
>
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