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melvin wellman · 08-23-2023, 12:44 PM

Just curious. With all the heads listed that would need modifications in order to be used, except the 915, I don't understand why the 516 head should not be listed, with the only modification of using the correct 1.74 exhaust valve in place of the 1.60 valve it comes with. I'm sure I'm missing something. But it don't make sense to me.

08-23-2023, 12:44 PM	#1
melvin wellman Junior Member Join Date: Jan 2015 Location: boulder, mt Posts: 14 Likes: 0 Liked 2 Times in 2 Posts	1967 plymouth gtx 440 cylinder heads. Just curious. With all the heads listed that would need modifications in order to be used, except the 915, I don't understand why the 516 head should not be listed, with the only modification of using the correct 1.74 exhaust valve in place of the 1.60 valve it comes with. I'm sure I'm missing something. But it don't make sense to me.