[Johns70]

heads are the key to big power for big blocks, all big blocks make tons of torque but the bigger the heads the more flow and horse power.

the 292 heads must be retangular port becuase my book shows them as a 70 454 450 horse with 2.19 intake valves and 1.88 exhuast.


but if you look at the better oval port heads they list casting #781,049,241,820,290 most of them have a 110 cc chamber, considerd a semi open chamber head which means more piston options to get the compression were you want it.good flow alsoaround 250 cc runners intake and 115 cc on the exhaust. the rectangular port heads are only running 300cc intake runners and 120 on the exhuast.