silicone head gaskets

Just had to replace the silicone head gasket on my '29. Went back to copper and sealer. Will not use the silicone gasket again.
 
I agree with Brent. I was forced to use one on a car that had been decked too much.
These gaskets are much thicker than the others and saved the day.
We installed a Snyders 5.5 compression head and resurfaced it before installing the head and to a very fine finish. I crept up on the torque 10lbs at a time. Then kept torquing each time it ran for several days then every few months for a while.
Its been 6 yrs. and still holding.

My choice is still the Best Graphite gasket, no problems.
 
I installed one of these gaskets according to the instructions (which said not to use a sealer) years ago and it failed fairly quickly. My model A parts vendor said he had no trouble with them - if you use a sealer.
This talk of them needing a fine finish makes sense. I think the use of a sealer compensated for a rougher surface
 
JayJay said:
Brent, as usual, you've given this discussion a different and thoughtful slant. I'm getting ready to build up a Burtz engine and haven't looked at the finish of the block or head yet. I'll have to evaluate when I get to that point.
Click to expand...

On the Burtz facebook page recently:

"Terry Nadia BurtzTop contributor
The upper surface of the cylinder block has the roughness needed for a good gasket seal. If you make it too smooth, you may have sealing problems. Our guarantee does not apply to unauthorized modifications."
 
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