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How did Mopar keep the same comp. ratio in a 383 when changing from early closed chamber heads to later open chamber heads? Early heads are ~73.5 cc's, and later heads are ~79.5 cc's. What changed to maintain 10 to 1 compression?...rod length, piston pin height???

I'm looking at picking up a '68 383 core engine. Here's a pic of the ID pad...can anyone decode it for me?

Here's a set on e Bay... http://www.ebay.com/itm/RARE-1969-Dart-Barracuda-Mopar-440-Exhaust-Manifolds-3462017-M-code-Cuda-/181121204540?pt=Motors_Car_Truck_Parts_Accessories&hash=item2a2baa413c&vxp=mtr#ht_215wt_1141 Good luck with the bidding! PS...standard non-affiliation statement...NOT...