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Loosen rad cap
Start motor and bring up to a temp that will open stat
Remove rad cap
Reach over and hold throttle around 2000 rpm
While holding throttle, fill rad with coolant
Put rad cap on
Release throttle
Loosen rad cap
Start motor and bring up to a temp that will open stat
Remove rad cap
Reach over and hold throttle around 2000 rpm
While holding throttle, fill rad with coolant
Put rad cap on
Release throttle
you haven't done so already drill one or two small (3/16" or so) holes in the rim of the thermostat too.