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RedSS454 Aug 20th, 04, 2:40 PM Can you ID my freinds BBC. I searched mortec and nastyz28 and could not find the number. Maybe a replacement block? I don't know. Here are the numbers 10522ORR. It might be an 71 LS6 block because it is supposed to match the heads he has. Any help will be appreciated. Thanks in advance, Chris mr 4 speed Aug 20th, 04, 2:56 PM Sure its not CRR? Bill Pritchard Aug 20th, 04, 9:26 PM ...and it's probably also a letter T at the beginning. DaleM Aug 20th, 04, 11:18 PM Originally posted by mr 4 speed: Sure its not CRR? If so, it's a 70 LS6 graemlins/hurray.gif 71 Chevelles didn't have any suffix of "xRR". The LS5 is CPA (man) and CPO (auto) while the 71 LS6 was CPY (man) and CPZ (auto). Dale shooter Aug 20th, 04, 11:56 PM I also see a 71 LS-6 M/T as CPP and A/T as CPR Way too many possibilities... smile.gif RedSS454 Aug 21st, 04, 9:43 AM This was done at a cruise, just looking behind the alternator and those are the numbers it oculd be. Also, what would the T mean at the beginning. If it is CRR (which I will check on Tuesday), He has 71 LS6 heads and a 70 LS6 block. Hes got some money in that motor, parts or not IMO. Thanks, Chris elcamino Aug 21st, 04, 7:08 PM T is the source engine plant, Tonawanda, NY | ||