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**DeadheadNM** · 09-22-2020, 07:22 PM

I took a look at mine. The Blazer has a four groove pulley on the crank (CA emissions AIR equipped) and a flat pulley on the pump. The k20 has a three groove pulley on the crank and a “recessed” pulley on the pump. Both have AC. The K20 engine was shifted forward to accommodate a 700r4 transmission hence the tighter space.

Edit: the pump and presumably the pulley are original to the Blazer per the date code on the pump.

09-22-2020, 07:22 PM	#14
DeadheadNM Carpe manana Join Date: Dec 2010 Location: Eau Claire, WI Posts: 12,287	Re: Need Help I took a look at mine. The Blazer has a four groove pulley on the crank (CA emissions AIR equipped) and a flat pulley on the pump. The k20 has a three groove pulley on the crank and a “recessed” pulley on the pump. Both have AC. The K20 engine was shifted forward to accommodate a 700r4 transmission hence the tighter space. Edit: the pump and presumably the pulley are original to the Blazer per the date code on the pump. Attached Images __________________ 1972 K5 CST Highlander Blazer: http://67-72chevytrucks.com/vboard/s...d.php?t=708547 1972 K20 Cheyenne Super: http://67-72chevytrucks.com/vboard/s...d.php?t=528308 Members met: ORANGBLAZ, 2003 silverado, MikeCofield, BB72CHEVKT, Duncan&Son, Sameyrasmea72, THENEWMEXICAN, HotRod C/10, brianthelion02, Sport/Truck, ryanroo, michael bustamante, Dirt's72, Already Gone, WestButteTruck, 57taskforce, Moreyel, painterljp, AASmedic, SoCoC10, Lumaestas, carbuff382, Chevyland Last edited by DeadheadNM; 09-22-2020 at 07:25 PM. Reason: POS iPad correction error