RARE !!! Standard Bore 1970 LS6 Block 3963512 cast C-20-70 code T0330CRV Is most likely the only chance you will get at a LS6 block that is Standard bore and will build Standard Bore1970 Chevelle LS6 454 450hp Engine Block 3963512 cast date C-20-70 with assembly code T0330CRV. Block is Standard bore with less than .0001 ware and will build at Standard Bore has been stored 45 + years. Is good usable GM 45 + year old part Sold as is no warranty no guarantee no return no refund sale final. shipping is for 48 states all others will require additional cost.I also have the CRW 12 bolt housing I will list later code CRW 0304 B1

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