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dmulally · 05-21-2022, 03:35 AM

Hi All,

I just installed a 350 Vortec from a '99 pickup into my 66 C20 that has a 700r4. On first start up I heard this god awful noise and could see some deflection from the front pulley so ordered a new one and replaced it. The sound persists.

To me it sounds too fast to be a stuck lifter. I took the belt off and the sound remains as I thought it sounded fast enough to be the water pump impellor.

My problem is that I'm mostly deaf so I can't actually tell which part of the drivetrain it is coming from. Flexplate bolts fouling to front timing chain I have no idea. Would anybody be able to have a guess as to what it is?

https://youtu.be/4jvq_UoU3M4

Thanks in advance.

05-21-2022, 03:35 AM	#1
dmulally Registered User Join Date: Feb 2018 Location: Shannon, New Zealand Posts: 31	Vortec 5.7 Mystery Sound Hi All, I just installed a 350 Vortec from a '99 pickup into my 66 C20 that has a 700r4. On first start up I heard this god awful noise and could see some deflection from the front pulley so ordered a new one and replaced it. The sound persists. To me it sounds too fast to be a stuck lifter. I took the belt off and the sound remains as I thought it sounded fast enough to be the water pump impellor. My problem is that I'm mostly deaf so I can't actually tell which part of the drivetrain it is coming from. Flexplate bolts fouling to front timing chain I have no idea. Would anybody be able to have a guess as to what it is? https://youtu.be/4jvq_UoU3M4 Thanks in advance.