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homer52 #1449468 Tue Apr 26 2022 05:19 AM
Joined: Feb 2004
Posts: 24,540
H
Kettle Custodian (pot stirrer)
Quit shotgunning parts at the problem and do some diagnosis. Try pulling the intake manifold and look for a vacuum leak at the bottom of the ports on the side that's fouling the plugs. Have the heads been milled?
Jerry


"Freedom's just another word for nothing left to lose"
Kris Kristofferson

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!

WAG MORE- - - - - -BARK LESS!
homer52 #1449470 Tue Apr 26 2022 06:48 AM
Joined: Nov 2005
Posts: 1,423
H
homer52 Offline OP
'Bolter
I am not doing this Jerry, my friend is. I am just trying to get suggestions to help him.


Pictures [s300.photobucket.com]
41 Chevy
41 GMC resting peacefully
46/7 Chevy
45 GMC panel truck in line for restoration
41 Plymouth in the restoration process
41 Chevy coe in line for restoration
homer52 #1449490 Tue Apr 26 2022 01:58 PM
Joined: Mar 2019
Posts: 1,379
G
'Bolter
As the saying goes.... Test, dont guess. Id check the timing chain to see if the chain jumed a tooth. Especially if it happened all at once. Do a compression check also. It will tell ya alot and not cost anything but time....

homer52 #1449502 Tue Apr 26 2022 03:25 PM
Joined: Nov 2005
Posts: 1,423
H
homer52 Offline OP
'Bolter
Compression check was all cylinders good and even, I think he said 145.


Pictures [s300.photobucket.com]
41 Chevy
41 GMC resting peacefully
46/7 Chevy
45 GMC panel truck in line for restoration
41 Plymouth in the restoration process
41 Chevy coe in line for restoration
homer52 #1449505 Tue Apr 26 2022 03:33 PM
Joined: Feb 2004
Posts: 24,540
H
Kettle Custodian (pot stirrer)
Good compression, plus fouled plugs on only one side screams "Vacuum Leak"! A milled head can expose the bottom of the intake passageways to the crankcase unless the intake is also milled to align the ports, and it ALWAYS happens on the bottom. Some NASCAR teams did that deliberately. The engine would run lousy and smoke during caution laps, then clear out and suck a little extra air past the restrictor plate at speed. One backfire can push the bottom of the intake gasket out and create a vacuum leak on an otherwise good-running engine if the gasket is just barely sealing before.
Jerry


"Freedom's just another word for nothing left to lose"
Kris Kristofferson

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!

WAG MORE- - - - - -BARK LESS!
Joined: Nov 2021
Posts: 307
F
'Bolter
Originally Posted by Hotrod Lincoln
Good compression, plus fouled plugs on only one side screams "Vacuum Leak"!
Jerry


Wouldn't a vacuum leak cause a lean condition?


1966 C-10 Step Side. 283, 4spd, 3.73 gear. 60K miles prior to restoration. 507 Paint Code. Currently in 10,000 pieces.
Transmission is done! Rear Suspension is done! Wheels are done! Bed bodywork is done! Soon to order a 383 crate.



Joined: Jun 2004
Posts: 8,539
W
'Bolter
Has he pulled the valve cover on that side. It may be the oil drain holes on the cyl. head may be plugged up letting oil get sucked down the intake valve guides.

George


They say money can't buy happiness. It can buy old Chevy trucks though. Same thing.

1972 Chevy c10 Cheyenne Super
Joined: Feb 2004
Posts: 24,540
H
Kettle Custodian (pot stirrer)
Originally Posted by Ferris Bueller
Wouldn't a vacuum leak cause a lean condition?

Yes. According to the original post, it's barely running, which happened suddenly. Sucking air and oil through a leak between the intake and the head will oil foul plugs quickly, and make the engine run rough. Fuel fouling and sooty plugs from running rich, on only one bank is highly unlikely. Sooty plugs indicate a fuel problem. Black, oily deposits are a different can of worms. We simply don't have enough accurate information to do more than guess about this situation.
Jerry


"Freedom's just another word for nothing left to lose"
Kris Kristofferson

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!

WAG MORE- - - - - -BARK LESS!
homer52 #1449525 Tue Apr 26 2022 05:48 PM
Joined: Nov 2005
Posts: 1,423
H
homer52 Offline OP
'Bolter
I totally agree, he has shot gunned the process so much we really don't know what is going on. I will report on the final solution if there is one.


Pictures [s300.photobucket.com]
41 Chevy
41 GMC resting peacefully
46/7 Chevy
45 GMC panel truck in line for restoration
41 Plymouth in the restoration process
41 Chevy coe in line for restoration
homer52 #1449596 Wed Apr 27 2022 01:35 AM
Joined: Mar 2019
Posts: 1,379
G
'Bolter
Not to mention, the lack of engine specifics dont help in any way of diagnosing this mysterious creature.

By the way what carb and intake are on this thing? Pics?

Last edited by glenns towing; Wed Apr 27 2022 01:36 AM.
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