71 LS6 Chevelles

[Rowdy Rat]

I'm with Charley... I've never seen a documented 1971 LS-6 Chevelle, although there was apparently at least one engineering/press fleet car and the option was listed in the AIM.

As far as the LS-6 Corvette (and the race package ZR-2 option which included the LS-6 engine), all were equipped with the "074" open chamber aluminum heads that were used on the second design L-88 and all ZL-1 engines... The L-89 aluminum head option was discontinued for Corvettes at the end of the 1969 model year (for Corvettes, that was mid-December 1969).

All L-89 Corvettes (as well as other Chevrolet vehicles with that option) used a closed chamber aluminum head; the "392" casting for 1967 and the "842" casting in 1968-1969 (as well as 1970 for a small number of Chevelles).

The intended production version of the 1970 Corvette LS-7 engine would have used the "842" aluminum closed chamber casting had it ever been released to the public.

Regards,

Stan Falenski