Chevrolet big-block engine
427
Table:
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)[a]

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[b]
430 hp (321 kW)[c]

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)(?)

Using the following table concerning 'Chevrolet big-block engine' — "427" section, compose one sentence describing only the highlighted cells and return it as JSON: {"answer": "YOUR ANSWER"}.