Join Date: Jan 2002
Location: Calgary, Canada
Re: space between intake and block
1/2" is a little large to just use silicone. I have had to make end rail spacers before, it is not that hard to do. Just make a template of the end rail off of the manifold or the block and make them out of 3/8 (.375) aluminum material. Then tap the block in the end rail holes and use countersunk machine screws to attach the spacers. Be sure to seal the spacers with silicone sealer, then simply use a small bead off silicone sealer to seal the manifold as per normal. I personaly like Permatex Ultra Seal Black.
You could also make some end rails out of cork type material and 3M ( yellow Death) them to the block, but this is less permanent.
I had to make some spacers this summer for my tall deck/canted valve SB, and the aluminum way worked excellent.
Hope this helps.
2002 Jerry Bickle Cavalier, 446" Small Block, Brodix Canted Valve, lenco 5 speed, 7.54 @ 180. mph,1.06 60', 2235 lbs for 2014. GM Canada Docs, Highly Optioned 69 RSZ28 , Hugger Orange, White Stripes, 42,000 mile survivor, owned since 1973.