I like to use a torque wrench to ensure even tightening and to avoid over tightening....The M20 has 10 off 3/8" diameter BSF head bolts and by comparing to more modern engines with the same diameter bolts (which did have a torque setting) and with a little experimentation I arrived at 28-30 ft./lbs as a practical setting for that engine...Ian

email (option): ian@wright52.plus.com

The W/NG doesn't have a head gasket to compress. The head and barrel should be lapped with grinding paste and four 3/8 bolts to nip up tight. Ron

email (option): ronpier@talk21.com

Thank you Gentlemen

As you say Ron it doesn’t have a head gasket, yes he has lapped it.
I suggested around 25 lbs( close to Ian’s Figures) but A no gasket to compress and B can’t get a torque wrench on the bolts.