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||“Original GM 1965 L78 396/425HP High Performance Engine & Heads--Casting Date E 5 5 (May 5, 1965). This is an original late production 1965 Corvette 4-Bolt Main block that has been bored to 4.250 to 427 specifications. Block cleaned, pressure tested, line bored & bored by an Award Winning local shop that has been in business over 40+ years. Includes original 6223 Forged Steel Crank that was polished STD/STD, New Solid Lifter Camshaft & Lifters to L78/425HP specifications. New double roller timing chain set. Original TRW 427 Pistons & resized factory Piston Rods with new HP bolts. Short-block is completely assembled---decked & ready for Broaching & Stamping to make numbers matching. Heads are Square Port High Performance GM #3856208 dated F 1 5 & F 16 5 (June 1& 16, 1965). Matched heads that have been completely rebuilt & are ready for installation. 7 angle valve job on installed hardened seats--L78 valve springs. Install heads-break-in ready! NCRS! Z-16--65/66 Chevelle/Impala also.”