GM / MerCruiser / Volvo / OMC V8 305 5.0L Cylinder Head GM 378450
Found on MerCruiser / OMC GM Chevy V8 305cid 5.0L 4BBL Models > 228hp & 230hp with 4BBL Intake Models 1977-1979 at the latest as this is an early version of the 378450 (there was a later version with larger valves)Used with the standard 2-piece Rear Main Seal engines.
Perimeter Bolt Valve Covers
NON-VORTEC Head (This shouldn't need to even be mentioned here)
12-Bolt Intake
Appears to have the 1.720" intake valves