Is my Hanes manual correct on Cyl. Head Torque?

My Hanes manual says 52 ft. lbs, then 90 degree angle torque, followed by a second 90 degree angle torque.

I have finished the first 90 degree angle torque and this seems really, REALLY, tight. A few of the bolts even seemed to give way a little toward the end of the 90 degrees.

It seems that if they are to be angle torqued, 52 ft lbs is very tight to start the procedure. The book gives, I believe, 70 nm and 52 ft lbs.

Any comments or information would be appreciated.

Thanks and have a great day,

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Larry Bible
'01 C Class, Six Speed
'84 Euro 240D, manual, 533K miles
'88 300E 5 Speed
'81 300D Daughter's Car
Over 800,000 miles in
Mercedes automobiles