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#2460689 - 12/12/11 06:04 PM Coolant leak, Intake or head gasket? (350 Chevy)
Rumble Offline


Registered: 03/25/09
Posts: 147
Loc: Eastern U.S.
My '92 Chevy engine (C-1500 truck) is leaking antifreeze near the intake manifold. This is on the left-hand side where the intake manifold bolts to the head (there's coolant on the manifold). Would this be a bad intake manifold gasket, or head gasket? I'm guessing it's just the manifold gasket. Your thoughts?
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#2460693 - 12/12/11 06:07 PM Re: Coolant leak, Intake or head gasket? (350 Chevy) [Re: Rumble]
Boomer Offline


Registered: 09/19/08
Posts: 1797
Loc: Pennsylvania
Also check the thermostat housing gasket. They can leak on these engines and cause a pooling around the intake manifold.
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#2460731 - 12/12/11 06:56 PM Re: Coolant leak, Intake or head gasket? (350 Chevy) [Re: Rumble]
FL_Rob Offline


Registered: 06/03/09
Posts: 1499
Loc: gulf coast FL.U.S.
Intake....If you don't want to invest alot in the engine,try bar's leak copper .Not silver .Not pellets .Copper ..Head and manifold sealer .Or tear it down and replace the Intake to head(LIM) gasket.BTW..Look for corroded fittings that may be leaking while you're there.Hope this helps.
P.S...Don't forget about the heater hose fittings,one left me scratching my head awhile.The Wye on the, or near the heater bypass.


Edited by FL_Rob (12/12/11 07:03 PM)

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#2460750 - 12/12/11 07:38 PM Re: Coolant leak, Intake or head gasket? (350 Chevy) [Re: Rumble]
cchase Offline


Registered: 11/03/09
Posts: 4018
Loc: New England
Intake manifold gasket. The spot you mention is where they leak on these trucks. Very common. Also very easy (and cheap) to replace. Don't skimp out, spend the afternoon and just do it in the garage. There's nothing complicated about replacing it.

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#2460783 - 12/12/11 08:07 PM Re: Coolant leak, Intake or head gasket? (350 Chevy) [Re: Rumble]
Rumble Offline


Registered: 03/25/09
Posts: 147
Loc: Eastern U.S.
Thanks everyone. Thought I was done with repairs for the year, lol. Never done one before, but I think I can handle it.
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'79 Cadillac Coupe de Ville 16K, Delo 15w-40
'92 Chevrolet C1500 "Sport" 142K, Delo 15w-40
'04 Chrysler PT Cruiser 91K, Exxon Super5000 10w-30

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#2460806 - 12/12/11 08:19 PM Re: Coolant leak, Intake or head gasket? (350 Chevy) [Re: Rumble]
Knox Offline


Registered: 05/16/11
Posts: 263
Loc: Kansas, USA
More then likely intake manifold. A bad head gasket is very unlikely to cause a leak there. Like cchase, mentioned, it's an afternoon job.

I'd double check my oil, to see if there is any antifreeze in it. I'm assuming your going to change the oil after the intake manifold gasket, so just keep an eye on it for the next few days.

Some intake manifold kits include a gasket for the lifter valley and some just include a tube of sealant. Just use the sealant, the gasket tend to slide out or move. If your set on using the lifter valley gaskets, may want to either rough up the surfaces a bit with some course steel wool or use a punch to put some "dimples" on the block and intake surfaces.
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#2461114 - 12/13/11 08:17 AM Re: Coolant leak, Intake or head gasket? (350 Chevy) [Re: Rumble]
artificialist Offline


Registered: 09/23/07
Posts: 8048
Loc: Florida
Determine that the head gasket is not leaking by using a block tester like this:
http://www.lislecorp.com/divisions/products/?product=406

It is still fresh on my mind when I fixed the intake gaskets on a GM 3.1 V6, AND THEN the HG leaked.

I don't encounter many Chevy TBI engines anymore, so I don't know if there exists a "Fel-Pro Problem Solver" gasket, but if one exists, buy it. It will outlast an OE gasket.
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