Will a 1985 Buick riviera turbo V6 3.8 liter engine mate to 1987 Pontiac fiero automatic transmission?
No, a 1985 Buick Riviera Turbo V6 3.8L engine will almost certainly not mate to a 1987 Pontiac Fiero automatic transmission. The bolt patterns, bell housings, and input shaft dimensions are highly unlikely to be compatible. Even if you found a bellhousing adapter (which is improbable for this specific combination), the torque converter and the hydraulic controls would present significant challenges, if not impossibilities. These are different GM platforms with different transmission designs.