Toyota Supra Forums! Join the Supra forum!

I think the important things are the HG thickness. And that no warpage on block / head mating surface. Check for warpage using a machinest straight edge and a feeler gauge, I think the maximum warpge allowed is .0002?? I have blown two composite factory hg's and decide to go with steel. Both problems were a blown hose and an suspected radiator leak.

The most important thing is to watch your hoses, belts and check your radiator level to make sure you are not losing coolant.

I doubt that cylinder honing affects the hg. However, boreing will. Checking the bore size is a good idea if there is possibility that the bore is not stock.senS

Over heating is one your worst enemies when it comes to engine damage, in my opinion.

Dan Swanson

Quote:

Originally Posted by oregonjoe (Post 72347)

Don't metal head gaskets require a perfect finish on both the block and head to seal correctly? I had my block out so I could have the deck shaved and the shop still would not recommend going to a metal head gasket. Seemed that over the years water/coollant eats away at ports so that even a good shave will not it get right.

before block prep

Attachment 2263

after block shave

Attachment 2264

Unless you going to remove the engine block grind the block deck to perfection - i'd go with a composite gasket. It will be much easier and last 20 years