Grand94AMGT

Doing full upper gasket replacement on a 94 3.1L.

Factory service manual says to torque the head bolts to 33ft pounds then an additional 90 degrees, is this correct?

Why dont they just give a specific torque to bolt them to without the extra 90 degree turn?

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1995 Jeep Grand Cherokee I6 4.0 - 2" Front Lift/1.75" Rear - ES9000 Shocks - Gas/TC/Front Skids - Front/Rear Tow Points - 242TC (Swapped from bad 231) Nearing 260K Miles

1994 Pontiac Grand Am GT V6 3.1L - Stock - 170K Miles

gmack221

If thats what the manual says believe it, why give a torque then 90deg ... make sure you replace the head bolts!, when they have you give it an extra 90deg they are torque to yeild bolts, which means the 90 deg actually streaches the head bolt a little bit, if you re-use them there is a chance you will not have the same clamping load, your head gasket will not last, and the bolts could break off. New head bolts, follow their torques, follow the order they say to tighten them in.