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Tractor Talk Discussion Forum

Chevy 350

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Tweeter

11-27-2004 15:48:48




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Yeah, I posted about my "88 K2500 350 some weeks ago over it leaking coolant. I finally replaced the intake manifold gaskets today. The passenger side rear was leaking. Does anyone know why those metal plugs with pin holes (in back) are in the gasket? I have never seen them before. There is a water jacket there that runs side to side and down the center. Anyway, got that done tomorrow I"ll have to set the timing and see how it runs. I will probably runs some Sea Foam through too. I had a rather low 90 lbs compression in two middle cylinders on passenger side.

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RJ-AZ

11-27-2004 20:16:15




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 Re: Chevy 350 in reply to Tweeter, 11-27-2004 15:48:48  
Yep - passenger side rear of intake manifold. They will do it every time unless you keep your coolant in top shape. There could still be a head gasket problem between two cylinders giving you the low compression readings. You need to learn how to do a cylinder leakdown test or have it done by a good mechanic.



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BushogPapa

11-27-2004 17:57:01




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 Re: Chevy 350 in reply to Tweeter, 11-27-2004 15:48:48  
Guys, Guys----Just be sure you put any Head gaskets on with the restricted passage in the FRONT..to force coolant to the rear of the block...!!!



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HarryG

11-27-2004 16:00:23




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 Re: Chevy 350 in reply to Tweeter, 11-27-2004 15:48:48  
Pin holes in metal gasket plugs are to slow down coolant flow for uniform temp. Inside cylinders run hotter due to the outside ones taking that temp so you don't want the outer ones run cool or they don't contribute all their power. 90 PSI ain't good. You are on misfire range about 80. Built several hundred Chev 350's racing so take my word. Talking overhaul or at least valves. Might be better re-evaluating and maybe replacing engine. Target engine for most is in 1300-1500 range (excluding labor)if vehicle warrantes it.

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lucass

11-27-2004 15:54:45




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 Re: Chevy 350 in reply to Tweeter, 11-27-2004 15:48:48  

those are so your water is forced out the front passages to the intake and thermostat,the idea is to get full circulation to all of the block and heads.lucas



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NC8N

12-13-2006 19:53:39




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 Re: Chevy 350 in reply to lucass, 11-27-2004 15:54:45  
Thats why Chevy developed the reverse cooling. Instead of the coolant going from the lower radiator through the block and heads and out the manifold, It goes through the heads first cause of more heat there. Makes sense.



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