Question for GMC 305 v6 owners - The 1947 - Present Chevrolet & GMC Truck Message Board Network

AngryPirate · 06-30-2025, 09:22 PM

Do my valves or more generally, my engine sound like it's supposed to?

I set the valves lash as instructed every where that's GMC 305 v6 specific but I'm wondering if a valve seals or something else is bad.

It also doesn't run well in 3rd gear (3 speed on the tree muncie) and sometime stalls attempting to accelerate in 3rd which is odd since it shift decently in 1st and 2nd.

I removed the gas cap (in case it was some sort of vacuum in the tank and I also removed the air cleaner in case it was an air flow restriction.

Also, my fuel filter seems to be running low but that mght be normal?

Thanks for any feedback.
https://youtube.com/shorts/BNwPQqVJD9A?feature=share

06-30-2025, 09:22 PM	#1
AngryPirate Registered User Join Date: Jan 2012 Location: Austin, TX Posts: 566	Question for GMC 305 v6 owners Do my valves or more generally, my engine sound like it's supposed to? I set the valves lash as instructed every where that's GMC 305 v6 specific but I'm wondering if a valve seals or something else is bad. It also doesn't run well in 3rd gear (3 speed on the tree muncie) and sometime stalls attempting to accelerate in 3rd which is odd since it shift decently in 1st and 2nd. I removed the gas cap (in case it was some sort of vacuum in the tank and I also removed the air cleaner in case it was an air flow restriction. Also, my fuel filter seems to be running low but that mght be normal? Thanks for any feedback. https://youtube.com/shorts/BNwPQqVJD9A?feature=share



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