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  1. 8

    Holley aluminum heads on 68 302 block - drill waterpassages?

    Thanks a lot for all the responses. When looking at the pics, it makes sense to drill the triangular holes into the block. Too bad I already drilled the small holes at 12 o clock into the heads and torqued them down :damnit: :bang: Can I re-use those nice $95 Felpro gaskets or do I need to...
  2. 8

    Holley aluminum heads on 68 302 block - drill waterpassages?

    Anybody else have any suggestions? thanks
  3. 8

    Holley aluminum heads on 68 302 block - drill waterpassages?

    I installed Holley aluminum heads on my '68 302, but I have been having issues with overheating and I can't figure out why. So I removed the heads again to check the HG and it was on right. But I found something else. The 68 block has a small water passage in at 12 o'clock when looking from...
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