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factorystock · 09-05-2021, 09:36 PM

Yes. The Chevy 230-250 was an option on '64-'66 GMC's. But, you will need the straight 6 bellhousing and 230-250 motor mounts also. You will need to relocate or lengthen the alternator wiring harness too ( located on right side of engine for V6--left side of engine on straight 6.

09-05-2021, 09:36 PM	#2
factorystock Registered User Join Date: Feb 2007 Location: west coast Posts: 3,400	Re: 1966 GMC engine Yes. The Chevy 230-250 was an option on '64-'66 GMC's. But, you will need the straight 6 bellhousing and 230-250 motor mounts also. You will need to relocate or lengthen the alternator wiring harness too ( located on right side of engine for V6--left side of engine on straight 6.