Wednesday, July 09, 2008


Hemmings Blog

Chevrolet has reissued a 430hp 427 to celebrate the big-block's 50th.
photo courtesy GM
A few years back, GM Performance Parts rolled out a reissue of the ZL-1 aluminum block, claiming that the original tooling used in 1969 to create the infamous alloy rat engine installed in just ’69 Camaros and two Corvettes had been updated and pressed back into service. Now, a complete engine assembly is being produced as part of the 50th anniversary of the Chevrolet big-block engine (we’re assuming GM is considering the 348 the first big-block).

The Anniversary 427 is filled with a forged-steel crank, forged steel connecting rods and forged aluminum pistons that make 9.5:1 compression when paired with the 110cc combustion chambers in the aluminum oval-port GMPP heads, also featuring 2.19/1.88-inch valves. A hydraulic roller-tappet camshaft with .510/.540-inch lift controls the valves through 1.7:1 roller rocker arms and an 870cfm four-barrel carb feeds the beast through an aluminum intake.Read More Here…

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