The V8 Owners Forum -

Just got a new comp valley gasket which I'm going to use with the Buick 300 Heads, coincidentally they are a perfect match for the larger Buick ports.

The question is that after machining the decks by 10-15thou and the heads by 20-30thou will I have a problem of the gasket sitting to high in the valley in relation to the inlet port openings?

I suppose if the gasket sits a little too high, say 30 - 40thou I could just open up the lower port area of the gasket to match, the actual bolt holes seem quite large and there is scope to move the gasket a little or is there a better solution?

Kevin.

You might run into problems getting the top to seal as the port in the gasket will be too high. I cut up two gaskets and stuck them together to solve this problem although I did have a bit more machined off than you have, assuming your heads were standard of course.

Marki,

With the ports of the Buick head being 6mm. larger in height ie 3mm. either side of the bolt holes there should hopefully be more than enough metal for the gasket to seal to, it's almost as if the comp gasket was made for the buick heads.

Just in case I do still have a problem, where abouts did you cut the gasket and what did you use to glue it back together, presumably you just butted it together, did it still seal ok?

Kevin.

I basically cut them roughly 3/4 each and used pop rivets and rtv along the joint lines. Basically enough so there wasnt any doubling of the gasket near the heads The last one I did I havent ran yet but the ones before were fine.

Thanks Marki, but whats RTV

Kevin.

Automotive silicon basically

Thanks

RTV = Room Temperature Vulcanising

.... or something