[Speedwaypj]

ByronRACE thx... I was only going to do the petcocks because I'm not sure if that is the issue...then I would plumb it in.... but from what you say, maybe I'll plumb it now.

- checking Temp Delta.. but what/ where? Radiator Input vs output? What's a good value ?? 10 ; 15; 20 degrees?
Air delta? I have an infrared Thermo gauge but suggestion for Air medium?

Sooo would any of these following points below hold water(not really a pun).......or can crack/void be so small it only leaks under running high cyl pressure?
- Wouldn't the compression test indicate bad head/block/gasket?
- Wouldn't the radiator test (26/28 hrs) indicate bad head/block/gasket?
- I've run it for about an hour several times...if bad head etc, wouldn't it burst the hoses? Max was 20 PSI..

I'm pulling the intake today to drill/tap for petcocks (maybe bleed lines)....but i'll wait until I get my "Cooling System Vacuum Purge And Refill Kit" from ebay($35 investment) to add coolant.....
Have any of you used the vacuum purge system? YouTube videos look logical...

thx again all!
PJ