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Thermostat - 302
#1
I have been told by many to drill a 1/8" hole at the upper edge of the thermostat before placing it in the housing to alleviate the initial pressure.  However, the new one I purchased does not have a hole and I cannot find a thermostat for a 73' 302 anywhere with a pre-drilled hole.  There are also no mention of drilling a hole in any of the old repair manuals for the car 

Is this recommended?  If the hole is drilled, what are the consequences?

Thanks,     Thankyouyellow
Dan

[Image: IMG-20180901-180559190.jpg]
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#2
The idea behind the hole is to allow any air to bleed out of the intake before the t-stat opens. This prevents the initial huge "burp" as the trapped air comes blasting out the top radiator hose.

There is no downside to drilling the hole. Just get a good quality t-stat and do the deed. When you install it, put the hole at the 12 o'clock position.


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#3
(01-23-2019, 08:59 AM)Thank you again sir. We\ll drill away later today.  Hemikiller Wrote:  
The idea behind the hole is to allow any air to bleed out of the intake before the t-stat opens. This prevents the initial huge "burp" as the trapped air comes blasting out the top radiator hose.

There is no downside to drilling the hole. Just get a good quality t-stat and do the deed. When you install it, put the hole at the 12 o'clock position.
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#4
the best place to drill the 1/8 in hole is between the "Y". and have it at 12 like mentioned. also if u install with the "Y opening at the top and get a new stat housing with a access hole on top u can put in a temp gage there and not hit anything. so no removal and placement of stat housing once done.
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#5
(01-23-2019, 10:38 AM)thank you.  Never thought about putting a temp gauge there, but excellent thought.Dan delawarebill Wrote: the best place to drill the 1/8 in hole is between the "Y". and have it at 12 like mentioned. also if u install with the "Y opening at the top and get a new stat housing with a access hole on top u can put in a temp gage there and not hit anything. so no removal and placement of stat housing once done.
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