41/53dodges Posted March 13, 2012 Report Posted March 13, 2012 I have 2 pairs of heads off 218/230's, regular short 23" blocks, a pair of each style. They both bolt on, but one has a deeper but shorter head chamber, while the others have a longer but shallower chamber. the shallow ones have about 75CC while the deeper ones have about 100cc. whats goin on here? Im going to mill one either way, but where did these come from and why are they different? industrial and automotive? Quote
Niel Hoback Posted March 13, 2012 Report Posted March 13, 2012 Somebody already shaved one of them. Quote
41/53dodges Posted March 13, 2012 Author Report Posted March 13, 2012 Somebody already shaved one of them. likely the 75 cc one, arent they supposed to be 85cc? Quote
Plymouthy Adams Posted March 13, 2012 Report Posted March 13, 2012 depends on the advertised CR of the engine.. Quote
Rusty O'Toole Posted March 14, 2012 Report Posted March 14, 2012 They increased the compression ratio every few years. 1945 - 48, 6.6:1. 49-52, 7:1. All the way up to 8:1 in 1959. There may have been different heads for 218 Plymouth and 230 Dodge giving the same compression ratio but bigger chamber for Dodge. If there is a casting date or part number on the head you may be able to figure out what heads you have. But it would be easier just to use the one with the smallest combustion chamber and highest compression. Quote
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