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Unlike the later, second-generation 427, it was based on the W-series 409 engine, but with a longer 3.65 in (92.7 mm) stroke. A high-rise, two-piece aluminum intake manifold and dual Carter AFB carburetors fed a 13.5:1 compression ratio to produce an under-rated SAE gross 430 hp (321 kW) and 575 lb⋅ft (780 N⋅m).
The L72 was a 427 cu in (7.0 L) 90° overhead valve V8 big-block engine produced by Chevrolet between 1966 and 1969. Initially rated at 450 horsepower, the rating dropped to 425 hp (317 kW) shortly after its release (although there was no change in power).
The single-snorkel air intake used since 1976 was changed to a dual-snorkel set-up on L82 equipped cars helping to boost that output to 220 hp (164 kW). L82 engines were also now fitted with an aluminum intake manifold which saved 24 pounds compared to the cast iron unit of previous years.
Requests from dealers (notably Don Yenko in PA, Baldwin-Motion in NY, Nickey in IL and Dana in CA) who had been dealer-installing 427 cu in (7.0 L) engines in the Camaro prompted Chevrolet to use an ordering process usually used on fleet and special orders (taxis, trucks, etc.) to offer 427 engines in the Camaro. Two Central Office Production ...
It was its own separate engine design, based on a single block casting, [19] which had four exhaust manifolds, two carburetors and intake manifolds, and two distributor caps driven by a single distributor drive, [19] plus other parts from the 351 V6. A total of 56 major parts are interchangeable between the Twin-Six and the other GMC V6 engines ...
It offers the airflow of more expensive heads, at a much lower cost. It does, however, require a specific intake manifold (the L31 has four bolts per head attaching the intake manifold, as opposed to the "traditional" six bolts per head found on older Chevrolet small-blocks). Chevrolet's L31 was replaced by GM's LS-based 5.3L LM7 and 6.0L LQ4.
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