In 1975~76 GM did some interesting and pretty much unnoticed. Introduced the Chevy Cosworth Vega.
https://en.m.wikipedia.org/wiki/Chevrolet_Cosworth_Vega
The Cosworth Vega Twin-Cam engine is a 122 cu in (1,999 cc) inline-four with die-cast aluminum alloy cylinder block and Type 356 aluminum alloy, 16-valve cylinder head with double overhead camshafts(DOHC) held in a removable cam-carrier that doubles as a guide for the valve lifters.
The engine has a stainless steel exhaust header and Bendix electronic fuel injection (EFI), with four injector valves, an electronic control unit (ECU), five independent sensors and two fuel pumps.
3,508 of the 5,000 engines were used. GM disassembled about 500 and scrapped the remainder.