305 to 350 motor swap question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

rikoshea83 · 09-06-2018, 11:14 AM

I am going to be putting in a 350 motor that will replace my 305 in my 85 GMC. I need to get some new pulleys as some of the ones on the current motor are not the original equipment. I need to order a water pump pulley and a crank shaft pulley. In the LMC catalog, they offer 2 & 3 groove crank pulley and a 1 & 2 groove water pump pulley. I will be running A/C and need to know which combination of the two that will work together. I called LMC and they didn't offer much help. Can anyone help me with this?

Thanks,
Rick

09-06-2018, 11:14 AM	#1
rikoshea83 Registered User Join Date: Jun 2018 Location: Augusta Posts: 13	305 to 350 motor swap question I am going to be putting in a 350 motor that will replace my 305 in my 85 GMC. I need to get some new pulleys as some of the ones on the current motor are not the original equipment. I need to order a water pump pulley and a crank shaft pulley. In the LMC catalog, they offer 2 & 3 groove crank pulley and a 1 & 2 groove water pump pulley. I will be running A/C and need to know which combination of the two that will work together. I called LMC and they didn't offer much help. Can anyone help me with this? Thanks, Rick Last edited by rikoshea83; 09-06-2018 at 11:51 AM.



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