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Originally Posted by GTX JOHN
As I recall the 1967 375 HP engines had 2.08 and 1.75 Valves and were stamped HP on flat area on front of head. The lower HP versions such as in the full size none HP "C" body had 2.08 and 1.60 valves. Only apparent difference was valve size...casting was identical on all 915's. You do have to run original stock size exhaust valve on early engine 1.60......but they still work fine. John Irving
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Hey John, you are correct the 67 915's have the larger exhaust valve and the 66 model 915's have the smaller valve, but the 66 heads also have a higher floor and longer transition and hump than the 67 heads with the larger valve. At least according to the heads I have and have worked on. But, do the 66 915's flow better straight "stock" than the 516 head. Hope I have all these part numbers correct, tryin' to pull them out of a toasty head from the holidays. Still, I know the rules dictate stock sized valves.