I have tried that . Tapped the bypass hole to 1/8NPT (?) and fitted a aluminium plug , I think I went 1/8" drill through it . I understand it to force more coolant through the motor .
The hole allows system to bleed .
Tex
New best ET 10.259@129.65 . New best MPH 130.32 Finally fitted a solid cam, stepped it up a bit more 3690lbs through the mufflers New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm Power by Tex's Automotive
