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International Automotive Technicians Network
Re: Defective Lifters
Posted to Technical Discussion Forum on 3/3/2023

I did a couple of Vortec engines with noisy lifters about 10-15 years ago. One is still on the road. I used Comp Cams lifters. I have no idea who manufactures them.

Side note, owner said they [both trucks] started knocking after he switched to Valvaline synt... Login to read more.