![]() ![]() The 280H wanted 6500 and -7000 rpm shifts.īut max HP spread was only 150 RPM between the 2 camshafts. Small 601's with 1.84-1.50 valves But best shift RPM at the track for the 268H was 5500 RPM for the 1-2 shift and hold 2nd gear to 6000 or 6500 it did not matter it was the 1-2 shift that made 2 tenths difference. I stuck in a 280H on a 110 and made max wheel HP at 5,850 RPM Same heads and everything. My custom ground 268H on a 106LSA made max power at 5700 RPM and on a 112 made the same at the same RPM. Now just because an engine revs to that RPM does not mean it is making max power at that rpm. With ported heads holding 1.84 or 1.94" intake valves it would twist to 70 rpm. Ran it in a 355 one time with 305 2 barrel heads 1.72-1.50 valves Ported of course. ![]() Then the 280H rated at 2000-6000 RPM and. Head flow will make a huge difference in RPM Stuck Ported 601 onto it and gained 1000 RPM on the shifts. That was a 350" with RPM intake and 750 carb and headers 487X heads. Stock non ported heads with stock valves run out of steam with that 268H at 5500 rpm so quite accurate. ![]() Take the Comp high energy 268H for example it is. Rated camshaft RPM is as accurate as comparing advertised duration without knowing at what lift. ![]()
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