Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - To Drill or Not To Drill Thermostat
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Old 01-02-2011, 05:19 AM
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When does it heat up? Driving, cruising, traffic?

In my opinion, I don't think drilling is going to help you. Drilling the t-stat is to bypass coolant before the t-sat opens or to help burp the air pockets out. I drilled mine on my BBC because I have no prevision for the factory style bypass. Once the t-stat opens it doesn't matter if it is drilled or not. You could try a high flow stat.

The manifold is about 10* cooler than the head.

Also, what type of shroud do you have?

I would just put the 180 in without drilling and lower the temp at which your fan(s) come on.

Last edited by NOlowrider; 01-02-2011 at 05:26 AM.
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