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390 exhaust leak or stuck lifter?

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one bad rambler View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote one bad rambler Quote  Post ReplyReply Direct Link To This Post Posted: Oct/02/2017 at 8:14pm
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...
68 AMX 390 4 Speed,68 American,64 American 2 Door Wagon Altered Wheelbase,78 Concord Build 360,727,8.8
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wantajav View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote wantajav Quote  Post ReplyReply Direct Link To This Post Posted: Oct/02/2017 at 8:51pm
Get one of those automotive stethoscopes from HongKong Freight. Cheap $3.99 and works great to pinpoint your noise.


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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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Post Options Post Options   Thanks (0) Thanks(0)   Quote grparen Quote  Post ReplyReply Direct Link To This Post Posted: Oct/12/2017 at 12:56pm
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote gremlinsteve Quote  Post ReplyReply Direct Link To This Post Posted: Oct/12/2017 at 1:12pm
It's an exhaust leak if it's doing that
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Red20 Quote  Post ReplyReply Direct Link To This Post Posted: Oct/12/2017 at 1:26pm
Originally posted by gremlinsteve gremlinsteve wrote:

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


X2, yep.
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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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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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Post Options Post Options   Thanks (0) Thanks(0)   Quote 6PakBee Quote  Post ReplyReply Direct Link To This Post Posted: Oct/12/2017 at 2:54pm
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
1969 'B' Scheme SC/Rambler
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Red20 Quote  Post ReplyReply Direct Link To This Post Posted: Oct/12/2017 at 4:55pm
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.
1969 Javelin SST "Screamin' Banana" - Totaled Feb 2018
1973 Hornet Sportabout X "yellajack" - 360/727/TracLoc DAILY DRIVER
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