[Chevelle-list] Muscle Cars

[Malibu]

I saw this in a Hemmings News letter. Thought I pass it on.


  
Muscle Cars
Z-L1 power returns

      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. 

According to GMPP promotional materials, the Anniversary 427 is tagged at 430hp to match the rating of the original, though it advises that this engine is “grossly underrated.” Only 427 copies will be produced and each will come with an individually numbered “Collector’s Kit” that contains a certificate of authenticity, three forged “Anniversary 427” emblems — one for each fender of the recipient vehicle and one to stash, a photo-etched, serialized underhood engine data plate, and an Anniversary 427 air cleaner decal. 

We haven’t seen pricing (GMPP is auctioning off number 001), but this is allegedly the last project the ZL-1 block tooling will be used for before being retired. For the rest of the story, go to www.gmperformanceparts.com 
- By Terry McGean 
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