Northstar Engines and System Technical Discussion Discussion, two torque sequences? in Cadillac Engine Technical Discussion; i've heard of two torque procedures for the heads now,
one is 22 lb/ft + 90 degrees + 90 degrees
The original torque spec. for the early N* if I remember correctly is 22 lb/ft plus 60+60+60 degrees torque angle. Since you have time-serted the block any combination of the different torque values should work. After time-serting the block I used the 30 lb/ft plus 70+60+60 torque angle on mine but this was done using a torque angle gauge (which IMHO is a difficult tool to use accurately). When I do the next head gasket job on a N* I plan to use the 30 lb/ft plus 90+90 degrees of torque angle method and leave the torque angle gauge in the drawer.