Reply to "casting numbers?"

George PAdmin.

Dennis,

there are no bad Cleveland heads, some are just better than others.

The '73 to '74 heads still have large ports. They have the largest combustion chambers (78.4 cc nominal) and the smaller 2V valves, but you have to replace the valves anyway, right? So you replace them with 4V size valves.

With flat top pistons & a zero decked block, those heads will yield about 9.0:1 compression ratio, assuming the motor has not been bored or stroked. Milling another 0.030" off the heads will yield about 9.5:1 compression ratio. This is a reasonable compression ratio for a mild sreeet motor running pump gas.

These are also great heads for a stroker as the compression ratio will be OK even with flat top pistons.

Keep in mind those "junk" heads will support over 650 bhp with the right motor work. Do that with a set of 1973 Chevy castings!

your Cleveland loving friend on the DTBB

7/31/063:32 AM

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