For just two short years, GMC/Chevy manufactured the LM4. The LM4 is essentially an aluminum block version fo the LM7, using the same cylinder heads and camshafts.
These engines use drive-by-wire throttle control.
The Chevy 325 LM7 was found in production Chevrolet, GMC, and Cadillac trucks less a half-ton or less. This Includes: