Barring an angle guage,90 degrees is a quarter turn. You can judge your starting and ending points and just turn it a quarter turn. Another method I have used is to dab a bit of paint or nail polish on the bolt heads, and use that as guide for a quarter turn.
45 ft lbs, 65 ft lbs, 65 ft lbs, 90 degree turn.
After you've installed all the bolts and tightened them until they touch, start from the center and work torwards the ends criss-crossing side to side. The small bolts are 17 ft./lbs, the corners are 25 ft./lbs. Tighten in three stages.
If you are talking about torquing down the main bearing caps, the two inner bolts are the ones closest to the center of the cap, and the outers are furthest away.
it's hard to say how much to tighten the head bolts without torqing them. I would snug them with a ratchet, and then go around the proper sequence with a torque wrench.
This process is for angle heads struds ( original from Mitsu)... First initial torque must be 20Nm in alternate bolts from center to outside. follow above numbers.... 7 3 1 5 10 9 6 2 4 8 Next step is unscrew all bolts in reverse sequence. Next step is torquing again all bolts in initial sequence with 70Nm. Next step is torquing all bolts in same sequence rotating at 90 degrees. Last setp is torquing all bolts in the sequence for more 90 degrees..
that depends on what you're torquing, ie wheel lug nuts, intake manifold etc. check the proper service manual for the item. intakes are in a spiral pattern from the inside bolts outward probable a step torque like (small #) ft-lbs, (higher #) ft-lbs then 180 degree turn need a special tool called a torque-angle
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