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There were two different 915 heads in 67. Hp with the 1.74 exhaust valves that were used in the RT's and GTX's not sure if any others. And the LP 915's that had the 1.60 exhaust valves that were in the C body cars with 440's. I had heard there were some 383 LP engines that had 915's but most were 516 heads. There is a HP stamped on the larger exhaust heads. With that being said these heads can be opened up to 1.74 .Silly me, but a 915 head is a 915 head. Does it have the 2.08 / 1.74 valves?
There were two different 915 heads in 67. Hp with the 1.74 exhaust valves that were used in the RT's and GTX's not sure if any others. And the LP 915's that had the 1.60 exhaust valves that were in the C body cars with 440's. I had heard there were some 383 LP engines that had 915's but most were 516 heads. There is a HP stamped on the larger exhaust heads. With that being said these heads can be opened up to 1.74 .