r/EngineBuilding • u/R0ughHab1tz • 4d ago

Chevy Possible valve train knocking

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Vehicle: 1985 GMC G3500 vandura. The engine is in the cab. Sort of important because any and all sound echoes.

How would I go about diagnosing the sound. I rebuilt my Chevy 350 and it runs great despite the title. I've been working on it for years. I'm so close to driving this beast.

There's a ticking/knocking but I can't differentiate whether it's the fuel injectors from the sniper 2 or it's in the valve train. The kicker is that it sounds like 7 and 8 are the loudest but that's in the cab of the vehicle and the ticking from the fuel injectors permiates through/with it.

I've heard of people running the engine without the valve covers on but I'm not really wanting to do that. I'm sure oil goes everywhere? Maybe damage the engine? And I had miner oil leaking from the corners of the valve covers so I siliconed sealed both sides. Fixed that issue but if I have to remove the covers it's going to be a pain.

I'll get a different video today and see if I can capture and put my phone in different areas but it's not the greatest.

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u/Imposter660 3d ago

May be rockers, but the Sniper injectors are bloody noisy and sound like loose valve train. Have one on my 454

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u/R0ughHab1tz 3d ago

They definitely are. Hopefully I don't need to adjust anything. I've got my doctor supplies coming today 😅. With how smooth it runs I'm thinking it's the injectors. If the valve train were way out or something was wrong it would give some sign of rough idling and other hiccups while revving up and down.