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390 exhaust leak or stuck lifter? |
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Boris Badanov
AMC Addicted Joined: Dec/14/2013 Location: NH USA Status: Offline Points: 4209 |
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Posted: Oct/12/2017 at 7:22pm |
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Exhaust.
Sounds like you have headers and a leak. |
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Gremlin Dreams
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limachine
AMC Apprentice Joined: Apr/02/2009 Location: Long Island Status: Offline Points: 151 |
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Yeah, the roller tips will quiet down above 1500 rpm or so. I also had a problem with Chinese lifters. I built my engine with an old stock Crane hydraulic cam, so went with their lifters. 3 of them would intermittently clack away until they felt like working again. So I swapped them out for Comp Cams, and had more problems with collapsing. A little research turned up the majority of the good old brands were being made overseas by the same foreign company with crappy materials and incorrect specs. The only American made brands were Jessel and Isky. I swapped in the Iskys and had better results. After all that, I went solid with Edelbrock heads. What a difference!
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Red20
AMC Addicted Joined: Jan/29/2013 Location: Oceanside CA Status: Offline Points: 1556 |
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That's also an interestIng point. I heard that from someone at a car cruise. Another guy thought my lifters were noisy and a second guy asked if I had roller rockers and a hydraulic cam. Sure enough. I'm used to it and hardly notice anymore. Originally, I was concerned and readjusted preload twice before just setting it while running with a set of valve covers modified to do that. There was a significant difference in clattering lifters and the lighter chatter that's normal with my setup. |
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1969 Javelin SST "Screamin' Banana" - Totaled Feb 2018
1973 Hornet Sportabout X "yellajack" - 360/727/TracLoc DAILY DRIVER |
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6PakBee
Supporter of TheAMCForum Charter Member Joined: Jul/01/2007 Location: North Dakota Status: Offline Points: 5457 |
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Well, there's an exception to any rule. This was out of a 392 IH that was quite as death when running. |
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Roger Gazur
1969 'B' Scheme SC/Rambler 1970 RWB 4-spd Machine 1970 Sonic Silver auto AMX All project cars. Forum Cockroach |
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limachine
AMC Apprentice Joined: Apr/02/2009 Location: Long Island Status: Offline Points: 151 |
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To check for exhaust leaks, grab an insulated glove or at least a folded up rag and with the car running, temporarily block off each tailpipe while your buddy listens if the tick gets louder. Don't seal it off completely! Just apply pressure to the tailpipe and let off a few times and listen for a change. If it don't change cold or hot, no leak.
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limachine
AMC Apprentice Joined: Apr/02/2009 Location: Long Island Status: Offline Points: 151 |
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If you're running roller tipped rockers with a hydraulic cam, that's your noise. After they break in, they get noisy. With a solid cam you won't notice, but with a hydraulic cam, it sounds like a bad lifter. Comp cams tech will verify that if you call them (just as an example). Drove me nuckin futs.
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Red20
AMC Addicted Joined: Jan/29/2013 Location: Oceanside CA Status: Offline Points: 1556 |
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X2, yep. |
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1969 Javelin SST "Screamin' Banana" - Totaled Feb 2018
1973 Hornet Sportabout X "yellajack" - 360/727/TracLoc DAILY DRIVER |
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gremlinsteve
AMC Addicted Joined: Dec/16/2008 Location: houston Status: Offline Points: 884 |
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It's an exhaust leak if it's doing that
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grparen
AMC Apprentice Joined: Jan/02/2008 Location: Texas Status: Offline Points: 177 |
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I notice the tick goes away when I let off the gas while driving. Also, I put a stethoscope all along the valve cover while idling and I do not hear the tick even though it is present. Maybe it's the donut! Any other ideas?
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Gary Parente
1969 S/C Rambler B Scheme 1964 American 330 2 Dr Sedan |
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grparen
AMC Apprentice Joined: Jan/02/2008 Location: Texas Status: Offline Points: 177 |
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No, stock exhaust manifolds.
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Gary Parente
1969 S/C Rambler B Scheme 1964 American 330 2 Dr Sedan |
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