304 engine noise under load - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 04-23-2005, 03:32 PM
ddwyer
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304 engine noise under load

I have a '74 Scout with a 304 in it. I built it about 5 years ago. Runs well. Started hearing a tapping in 3rd and 4th gear as I accelerate. Does not sound like a knock but a tap, especially when I'm cruising and then give it just a little more gas. Don't think it's spark knock. Checked and adjusted dwell a few degrees. Tried premium gas, tho I really had to bite the bullet on that one. No help. Checked the lifters for play and used a stethescope to listen for any errant noise at idle. Nothing. Only seems to tap under a load. Good compression, so I don't think it's valve train related. I'm going to try to clamp my stethescope with a long hose on it to various engine parts and listen for noise when underway and under load. Any ideas?
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post #2 of (permalink) Old 05-11-2005, 09:48 PM
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Re: 304 engine noise under load

Exhaust leak? Trans issue? Man you've tried a lot too... problem is none of it was tested under load was it?
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post #3 of (permalink) Old 05-12-2005, 06:08 AM
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Re: 304 engine noise under load

If its not valvetrain related youve prolly got a cracked exhaust manifold. Theyre known to crack on the left side towards the back.

Brent, you have a heep and a zuk. What the hell are you doin here.
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