• 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
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]
  Reply
#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.


  Reply
#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.
  Reply
#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.
  Reply
#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.
  Reply
Share Thread:  


Possibly Related Threads…
Thread Author Replies Views Last Post
  Exhaust for 73 Mustang 302 604calvin 6 344 07-02-2019, 07:47 AM
Last Post: MeanMachine
  302 2V new cam, which upgrades necessary 1971V8 10 462 05-14-2019, 02:29 PM
Last Post: Don C
  302 oil pan depth Danno 5 298 04-30-2019, 04:46 PM
Last Post: tony-muscle
  71 Mach 1 302 2V carb jowens1126 11 988 02-04-2019, 09:39 AM
Last Post: jowens1126
  73 302 ro 351w swap now transmission noise samckay 17 928 02-02-2019, 04:10 PM
Last Post: tony-muscle
Wrench Ford 302 Main Cap bolts Stang1972 4 454 01-11-2019, 10:56 AM
Last Post: c9zx
  302 engine identification & specs rjpohl 5 487 01-10-2019, 08:22 PM
Last Post: Hemikiller
  Thermostat malfunction? mbrew2 17 981 01-07-2019, 11:39 PM
Last Post: B229218



Users browsing this thread: 1 Guest(s)