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RedSS454 Sep 7th, 04, 10:47 AM 1971 454/375hp complete engine, The block casting no. is 3963512, stamped T0419CPD (4 speed car). Cylinder head casting no. 3993820 date coded D571 and D871. please let me know what month this was built. we are looking for the correct date for our 71. David Bates Sep 7th, 04, 3:14 PM T0419CPD: T = Tonawanda Engine Assembly Plant David Bates Sep 7th, 04, 3:23 PM T0419CPD: T = Tonawanda Engine Assembly Plant 04 = April 19 = 19th CPD = 454/365HP Head Casting 3993820: 1971 402/300, 402/330, 454/365, 113CC combustion chambers. D 5 71 = April 5, 1971 D 8 71 = April 8, 1971 So, I would expect probably 4th or 5th week of April 1971 Dave RedSS454 Sep 7th, 04, 4:12 PM Hi Dave, thank you very much. Jim RedSS454 Sep 7th, 04, 4:15 PM Hi Dave, just a question, If my cars production date was 1/12/71 should I be looking for an engine with a 1970 date code,to make it numbers correct, but not numbers matching Also, is that a 2 or 4 bolt main? I would assume a 4 bolt main due to that was the big motor in 71? RedSS454 Sep 7th, 04, 8:07 PM TTT David Bates Sep 8th, 04, 5:26 AM Jim, I would expect a mid to late December 1970 engine would be most correct for your Jan 12, 1971 car. And, the LS5 (454/365HP) was a two bolt main block. Dave Redmanf1 Sep 9th, 04, 4:00 AM On the 512 block I have seen them both 2 and 4 bolt. | ||