My understanding (only from what I've read) is not that other Pontiac heads will just bolt up, but that they can be made to bolt up with mods to the block, which includes relocating water passages. I'll have to go and check my back issues. I am positive that the SilverBird used RA IV heads on a 366 CID engine. I have some issues of Fast Lines in which VSE was selling the heads.
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Steve
1978 WS6 W72 4 Speed Trans Am - Martinique Blue on Light Blue - Fire Am Restification Project
1972 4-Speed 455 HO Trans Am - Original Cameo White on Blue car - Restoration Project
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