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Re: Any idea on what this knocking is 72 C20 350
Ok...those rockers look a little galled...but have seen worse....
Re starter clearance...I would shim it down about a 1/16"...shims are available from large online parts houses...
Before you pull the engine...I would be removing the intake manifold and pull those last two lifters...then inspect the cam lobes...look at the bottom of each lifter for pitting and damage...post pics...
Maybe a lifter has collapsed internally...or worse...cam lobe has died...
In reality, if the cam lobe has been damaged, that engine will need a full overhaul...
It might be time to invest in a nice Vortec 350 SB...gets rids of the two biggest gremlins in a small block chevy...flat tappet cam design and oil leaks from rear main oil seal, which I can yours has...350 Vortecs use a one piece rear main oil seal and a roller cam design...
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