Lowest valvetrain is the Crower stainless rockers and the Crower short polylocks. The valvetrain can clear with the standard valve cover gasket, but it's close enough that subsequent tightening over the life of the gasket might compress it enough to cause interference. I use the thick gasket and start off with a little over a 1/4" of clearance. Results also depend on the travel of the rocker and I'm usually at around .580" valve lift on most of the cams installed. Photo is '67 engine bay with the thick gasket, stock covers, and the brace in place with a few washers painted black between brace and manifold.
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Mick Batson
1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon.
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