How Do You "Drill" A T-stat - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 03-07-2005, 01:32 PM   #1
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Default How Do You "Drill" A T-stat

I see and hear a lot about people having a 180 "drilled" t-stat. By that what do they mean? I'm guessing its just that, drilling holes in it. If thats the case how do you do it without breaking it?
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Old 03-07-2005, 01:50 PM   #2
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http://www.zzperformance.com/article...d90601b745c321

http://www.zzperformance.com/products1.php?id=231


Tech article and a link to a photo of one. You need to drill the outside of the t-stat.
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Old 03-07-2005, 01:51 PM   #3
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I think you are just over thinking this - you just drill 2 holes in the flange of the T-Stat. I don't know what you could break in this process.
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Old 03-07-2005, 03:36 PM   #4
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You need to drill so the rubber seal doesn't block them. And those 2 holes are WAY too big. I'd say that Tstat would be for track use only.


http://www.bonnevilleclub.com/forum/...ill+thermostat
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Old 03-07-2005, 04:03 PM   #5
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I see. What are the adverse affects of having holes that are to big? I live in an extreme climate. Ranges from -20*F to 100*F. I am going to put on a 3.5" pulley. Heading into the warm season the 180 drilled is a must. But in winter should I switch back to the stock 195 even with the pulley?
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Old 03-07-2005, 04:50 PM   #6
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i had a 180 on mine with stock pulley and car barely got warm. it took about 35 minutes to get it to running temp. i switched back to 195 late in november and it will probably stay in there. the need has yet to pass 200, even on a warm night with no ice at the track.
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Old 03-07-2005, 06:12 PM   #7
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Those holes look like the size of the ones in mine. The car warms up fine with them, and maintains proper operating temp. Only in extreme cold weather it will take a long time to warm up.
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Old 03-07-2005, 07:39 PM   #8
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I had holes like that, and the car would never warm up in winter. I now have two 1/16" holes. About half that size. In a 180 stat.
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Old 03-07-2005, 07:41 PM   #9
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I have no problems with mine??

I got a 160* for summer use.....And track use.
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Old 03-07-2005, 08:18 PM   #10
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Yeah, those holes look to be AT LEAST 1/4". I wouldn't suggest more than 2 or MAYBE 3 (with mods that are creating more heat) 1/8" holes (which is what I found to be excellent in my 1998 SSE last September with temps in the low 80**).
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