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I've read where some guys have drilled a couple of 1/8" holes in their t-stats to prevent air pockets, especially when refilling the radiator. Any problems with this?

-also-

What's the best flush to use?
 

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I've toyed with that. I eliminated the temperature high spike I used to get as the t-stat was opening. I now run a 180 t-stat with one 1/8 hole.

I tried a 195 with several different hole sizes and number of holes to see if I could get the running temp to about 185-190. It didn't work, maybe because I gave up too soon.

I'm putting in a DeWitt aluminum radiator with Spal fans and a new Edelborck Alu waterpump. I'm sure I'll be toying with the t-stat again.:)
 

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If you are just worried about air pockets, do like the LT-1's, put a vent into the housing itself. It's real easy to bleed off trapped air.

As far as the hole in the t-stat itself, never tried it.
 
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