454 Occasional Lifter Tick - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Boog** · 01-28-2018, 12:41 AM

Back in the 70's some 454's developed occasional lifter peck. If I recall correctly a factory service bulletin instructed to drill a small hole in a oil galley plug at the front of the motor. Apparently the 73-74 years oil didn't bleed off quick enough in the lifter oil galley and the oil got too hot and thin causing the peck.
My Dad had a 72 Chevy wrecker with a 74 454 that did this is the reason I know of the TSB. We replaced the #1 cylinder lifters twice but the issue returned. We drilled the galley plug on that engine and it took care of the issue.
I don't remember the size of the hole we drilled in it though. It was 1975.
Member Keith Seymore has worked for GM forever and may have more info about it.

01-28-2018, 12:41 AM	#9
Boog laying low Join Date: Mar 2001 Location: Searcy, Ark. USA Posts: 13,001	Re: 454 Occasional Lifter Tick Back in the 70's some 454's developed occasional lifter peck. If I recall correctly a factory service bulletin instructed to drill a small hole in a oil galley plug at the front of the motor. Apparently the 73-74 years oil didn't bleed off quick enough in the lifter oil galley and the oil got too hot and thin causing the peck. My Dad had a 72 Chevy wrecker with a 74 454 that did this is the reason I know of the TSB. We replaced the #1 cylinder lifters twice but the issue returned. We drilled the galley plug on that engine and it took care of the issue. I don't remember the size of the hole we drilled in it though. It was 1975. Member Keith Seymore has worked for GM forever and may have more info about it. __________________ Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross



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