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: Ls6 melvin rehagen Mar 15th, 06, 9:38 AM Can Someone Give Me Info On This Engine? Front Pad Code Is Crr Block Casting Date Is Dg 71 512 Casting # Heads Are 291, Casting Date B5 71 I've Had This Engine For 22 Yrs, Pretty Sure Its Not Been Messed With Before Me. Anyone Know What I Have? Thanks 1968SS427 Mar 15th, 06, 10:09 AM CRR= 454/450HP with TH400 Dg71= unable to find 512= 3963512 block, 454ci '70-'76, 427ci '69 2&4 bolt main 291= 3964291 heads, '69-'72, 396/402/427 & 454ci...109cc chamber with rect. ports. B571= Feb.5,1971 alss Mar 15th, 06, 11:16 AM Looks to be a crate LS-6, not a warranty LS-6..many were sold at the parts counter. ALbert 1968SS427 Mar 15th, 06, 12:52 PM I agree........ the 291 heads were also used as crate heads. melvin rehagen Mar 15th, 06, 7:51 PM thanks guys "but" what about the CRR on the front pad? did GM stamp it that way? 1968SS427 Mar 15th, 06, 8:33 PM Yes, the CRR suffix on the pad states that the block was originaly used in a 1970 Chevelle SS that was a 454ci 450HP with a TH400 transmission. It appears the somewhere in time that engine was rebuilt due to the '71 heads. alss Mar 15th, 06, 9:10 PM Yes, the CRR suffix on the pad states that the block was originaly used in a 1970 Chevelle SS that was a 454ci 450HP with a TH400 transmission. It appears the somewhere in time that engine was rebuilt due to the '71 heads. I disagree with the rebuilt part..block is also cast 71...date code is misread from the block.( D g 71 ) this most likely was a complete engine that GM sold over the parts counter after the LS-6 70's made their mark on the performance market..it was a easy upgrade that many buyers/racers took advantage of. ALbert jfkheat Mar 15th, 06, 9:15 PM The block is a '71 block. The dg71 is an April ? 1971. The g is probaly a number that is hard to read because of the casting. It is probably an over the counter LS-6 engine bought in mid to late 1971. James jfkheat Mar 15th, 06, 9:16 PM You beat me to it Al. James melvin rehagen Mar 16th, 06, 8:31 AM thanks guys but that still doesn't explain the CRR STAMPED on a 71 blk!! alss Mar 16th, 06, 9:22 AM If in late 71 I wanted to buy a LS-6 motor for my Chevelle with a auto trans I am pretty sure I could have ordered a complete motor from GM..it would have been coded CRR..a four speed CRV, but if I blew up the motor in my LS-6 Chevelle and needed a warranty replacement it would have had a CE code unless the other thing happened..someone re-stamped the block!! | ||