They were a direct bolt-on for me, just clean the surface area of the top of the heads really well to insure a good seal. I used studs and nuts instead of bolts to secure them, that allowed me to loc-tite the studs to the heads in order to keep them where they belong. They have made a believer out of me, I'll never use steel valve covers again given the choice.
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Just call me LB.
'71 Cheyenne, 402BB, hauls blondes, brunettes, or redheads.
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