and the 6.2-liter supercharged LT4 engines. One of these new fifth-gen small block parts is a set of stylish cast-aluminum valve covers – a popular product across all applications, Katech says.

These silicone composition valve cover gaskets out-seal those old cork jobs, and without sealer. To Tell The Truth Westech's Steve Brule did a nice job for us dyno testing our LT4. Instead of a ...

The valve cover rails are also dual drilled to accept ... We ordered our heads as a complete set with GMPP LT4/ZZ4 springs (101 pounds at 1.78 inches, 332 pounds at 1.22 inches) with lightweight ...