Chevrolet big-block engine
427

Chevrolet big-block engine

Section Title: 427
Table Section Text: None

First Year	Last Year	Engine Code	Features	Compression ratio	Factory Gross Power Rating

1966	1969	L36	4-barrel	10.25:1	390 hp (291 kW)

1966	1969	L72	4-barrel + solid-lifters, more aggressive cam and high flow cylinder heads	11.00:1	425 hp (317 kW)

1967	1969	L68	L36 with 3×2-barrel carbs.	10.25:1	400 hp (298 kW)

1967	1969	L71	L72 with 3×2 barrel carbs.	11.00:1	435 hp (324 kW)

1967	1969	L89	L71 + aluminum heads; RPO L89 also applied to L78 "375 HP" 396 engine with aluminum head option.	11.00:1	435 hp (324 kW)

1967	1969	L88	Racing-spec cam, high-flow aluminum heads (casting #s varied by model year) and some upgraded, competition-grade parts	12.50:1	430 hp (321 kW)

1969	1969	ZL1	Aluminum block with open chamber "3946074" aluminum heads (the early Corvette RPO engine featured a closed chamber head); cam even "hotter" than L88's; upgraded parts similar to L88's	12.00:1	430 hp (321 kW)

1970	1977(?)	ZLX	L88-ZL1 hybrid; iron block with aluminum heads	12.25:1	430 hp (321 kW)(?)

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