plugging the coolant ports on 3800 Lesabre ? help - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 02-09-2014, 11:54 AM   #1
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Default plugging the coolant ports on 3800 Lesabre ? help

Ok my intake isnt leaking yet....but does anyone have a step by step with tap and pipe plug sizes....I want to do it without removing the intake......so all I would have to do is buy the plugs and a new gasket
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Old 02-09-2014, 12:20 PM   #2
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1/4" NPT. Use a tap as well. Take pictures if you can please.

Too bad you weren't supercharged. The holes are already recessed and all you have to do is dab some RTV into the holes and tap 2 dimes in. Done.
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Old 02-09-2014, 02:40 PM   #3
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https://www.gmforum.com/mechanical-1...2005-a-304071/

dont think i would try it on the engine thats just asking for trouble, and unless yo have replaced the gaskets they are likely bad and the elbow needs done too
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Old 02-09-2014, 02:41 PM   #4
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wouldnt need to do it if supercharged though,,,,doesnt have a plastic intake so I understood the sc models dont have the problem ?????
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Old 02-09-2014, 03:03 PM   #5
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No they don't but it reduces the overall temp of the inlet.
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Old 02-09-2014, 04:31 PM   #6
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I had thought they were 3/8 npt ???
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Old 02-09-2014, 04:45 PM   #7
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Ask Jwfirebird(Justin) up above. He did it recently.
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Old 02-09-2014, 04:49 PM   #8
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LOL, looks like you asked about this 2 years ago...

https://www.gmforum.com/buick-172/ne...-block-301957/
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Old 02-09-2014, 07:22 PM   #9
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I thought I did but couldnt find that link...
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Old 02-09-2014, 07:49 PM   #10
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yup now i remember reading that , lol.....I dont see why I cant drill and tap the LIM on the car...I would use a bottom tap and put vasoline on it to pull the chips up and hold them...would Lowes carry the hex drive pipe plugs ?
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