Selling my 383 sbc, decided to go a different route It's a vortec block from a 97 Tahoe. It was in my 83 firebird Flat top pistons with 7cc valve reliefs Summit 8803 cam587/576 lift 112 LSA 224/232 @50 Aluminum intake I had a 750 Holley on it but it's got a 600 just for now Scat 3.75 crankshaft Stock 4 inch bore so it's technically 377 cubic inches Comp cams ultra pro magnum 1.6 roller rockers All new rings & bearings Melling high volume oil pump 25-30 hot idle 50-60 cruising and goes up with rpm About 15 inches of vacuum HEl distributor I've always used NGK copper plugs and 15w40 oil AFR enforcer 1001 heads 195cc intake runner 2.02/1.6 valves 64cc combustion chamber Uses either vortec or 55-86 intake & valve cover bolt patterns 10:1 compression Double roller timing chain 1 piece rear main Educated guess, about 450 hp 153 tooth Flexplate Powermaster 1 wire alternator & starter I've got receipts and proof of the build. $3500 obo