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390 exhaust leak or stuck lifter?
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Boris Badanov View Drop Down
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    Posted: Oct/12/2017 at 7:22pm
Exhaust.

Sounds like you have headers and a leak.
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limachine View Drop Down
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Points: 151 		Post Options Post Options   Thanks (0) Thanks(0)   Quote limachine Quote  Post ReplyReply Direct Link To This Post Posted: Oct/12/2017 at 6:08pm
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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Originally posted by limachine limachine wrote:

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.


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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Originally posted by one bad rambler one bad rambler wrote:

Originally posted by Rebel Machine Rebel Machine wrote:

Originally posted by one bad rambler one bad rambler wrote:

Rounded over lobes don’t tick....Look closely around the ports for soot...and if your running stock manifolds check to make sure your heat riser isn`t rattling


Mine did. Wore a hole in the lifter face.

-Steve-

Then it wasn`t completely round..a fully rounded lobe doesn’t`t open the valve so it can`t tick...If it still had a profile and a hole in the base it would tick...


Well, there's an exception to any rule.  This was out of a 392 IH that was quite as death when running.
Roger Gazur
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1970 RWB 4-spd Machine
1970 Sonic Silver auto AMX

All project cars.

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Points: 151 		Post Options Post Options   Thanks (0) Thanks(0)   Quote limachine Quote  Post ReplyReply Direct Link To This Post Posted: Oct/12/2017 at 2:29pm
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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Points: 151 		Post Options Post Options   Thanks (0) Thanks(0)   Quote limachine Quote  Post ReplyReply Direct Link To This Post Posted: Oct/12/2017 at 2:17pm
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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Originally posted by gremlinsteve gremlinsteve wrote:

It's an exhaust leak if it's doing that


X2, yep.
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1973 Hornet Sportabout X "yellajack" - 360/727/TracLoc DAILY DRIVER
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It's an exhaust leak if it's doing that
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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?
Gary Parente
1969 S/C Rambler B Scheme
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Points: 177 		Post Options Post Options   Thanks (0) Thanks(0)   Quote grparen Quote  Post ReplyReply Direct Link To This Post Posted: Oct/04/2017 at 9:50pm
No, stock exhaust manifolds.
Gary Parente
1969 S/C Rambler B Scheme
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