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Originally Posted by newschool
these are the numbers on the heads
10114156 GM5 A045 CFO 158 & 156
the heads are 91-up oval open chamber gen V&VI 118cc chamber
That listing is from a reference web site
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I would not put those on a gen 4 block they will leak water into the valley area, They are also a net valve lash head you can put a bastard screw in stud in, but are not very strong. If you are doing a budget build on a mild motor, find some gen 4 heads if you need to the cheapest place is CP in WI you can get stainless valves springs locks retainers and seals for about $160.00 for bbc in small or big valve combo.