With cast iron heads it is 30 lb/ft. Tighten in a criss cross pattern.
Carefully tighten the bolts in a crisscross pattern to 45 inch pounds. Then re-tighten them to 83 inch pounds.
torque specs. on chevy sub for a 5.3L intake manifold and tighten sequence NEW ANSWER; step 1 is 44in-Lbs. then step 2 is 89in-lbs. That's it.
to tighten a intake manifold start with a center bolt and tigten in a circular pattern towards the ends. tighten bolts in even incraments until tight.
Cast iron heads are 30 lb/ft of torque. There is no sequence. Just tighten them all down very slowly in a criss cross pattern. In other words all at the same time.
All Chevy intakes use the following pattern, if it is aluminum you use a 3 step torque; IE: you tighten till the bolt touches the intake slightly throughout the pattern, then torque to 1/2 proper torque throughout the pattern, then to full torque throughout the pattern 9 5 1 4 8 12 (Front Drivers side) ----------------------------- 10 6 2 3 7 11 (Front) Please note that the editor here removes the spacing format, but the pattern is correct by bolt count.
i retorqued my Chevrolet heads to 90 ft. lbs. but i also found if you use the specific torque pattern the gaskets will seat better....i don't torque my intake boltsAnswer65 lb.ft.
how to torque an aluminum intake for 350 25 ft./lbs.
30 ft lbs. Use the manufactures recommended torque pattern
start with center bolts and work your way out in a circular patternaltenating from side to side
40 FT. LBS
30-ft. lbs
30f