The engine is manufactured by GM and uses a cast iron block and cylinder head with hydraulic lifters and 5 main bearings. The engine does have the Chevy bell housing bolt pattern though. The 151 (2.5L) inline 4 engine has been used since 1980 and it is often called the "Iron Duke", but is actually a Pontiac engine designed to replace the Chevy "Iron Duke" I4 engine. maybe the original Pontiac Firebird trans will even fit. If so then the TH180 bellhousing does unbolt from the auto trans. Click to expand.Unlikely to bolt up to the original GT auto trans as the Opel motor has its own distict bolt pattern BUT the TH180 auto was used by GM in many 4 cylinder applications and you may well find that the 2.5 GM motor used this same trans with its own particular bellhousing.
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