hi-po head gasket

[mcequalhp]

Anyone know if any of the steel shim "hi-po" gaskets are available anywhere?
This would be for an HS-50 I'm preparing.
Any help please,
Mike

 

[sludgeboy]

Tecumseh HS40 hi po head gasket

This is the only one I know. Says in stock.

 

[mcequalhp]

Ordered one today. I'll measure it and post the specs when it arrives.
The stocker is .078" thick.
Thanks,
Mike

 

[David wulf]

If you have a HS50 then the HS40 gasket might be smaller due to the fact that the HS50 has a bigger piston .

 

[Phil1958]

get some sheet copper and cut one out.

:thumbsup:

 

[cdoublejj]

so it's a thinner gasket. My machinist friend just lopped off half the head. :laugh:

 

[mcequalhp]

Installed the Hi-po head gasket and final assembled the engine yesterday.
Only able to do a quick test fire on the bench.

So here's the skinny on the head gaskets:

Stock metal-cork-metal gasket: .078" thick
Replacement "graphite gasket: .066" thick
Hi-po aluminum gasket .024"Thick

No sure how much the metal-cork gasket compresses, but the stock replacement gasket may give a small bump in compression.

The Hi-po head gasket does clear the HS-50 piston. (just barely)
and leaves the valve with just over .020 clearance to the head with a stock cam. Hopefully no clearance issues as long as there is no valve float!

 

[cdoublejj]

on my HS40 i think my buddy lopped of 50K. There is another thread here some where about milling heads and i posted pictures.

 

[cpt.slow]

how much power would this add