Fits:
1981-1982 Cutlass 440
1989-1992 Indy 500
1983-1987 Indy 600
1988-1990 Indy 650

These are approximately 45mm long, use an 8mm mounting bolt with a 62.35mm ( 2.455 ) H.R. bolt pattern and fit 36mm and 38mm carbs.