View Full Version : Factory torque setting for exhaust mainifold?

10-09-2011, 05:35 PM
I installed my new headers today. My Hanes manual calls for 33 ft/lbs of torque to seat them. Seems really, really light to me. Can someone confirm with a factory manual?

Thanks in advance-


10-09-2011, 06:25 PM
Tighten until breaking, then back it off 1/2 turn? :hill:

10-09-2011, 08:02 PM
'77 FSM says 28-37 ft-lbs. for the manifold. 36-51 ft-lbs. for California models.

10-09-2011, 09:18 PM
Good, I went with 38# as mud had it mentioned a few times.

I will retighten them after the first few heat cycles.

Thanks Matt!

10-10-2011, 09:38 AM
I had so many problems with my '78 2F backing off the nuts, that I put red Loctite on them and reefed them down to a lot more than 30-something. No problems since. I agree that 30-something lb-ft should be 'right' for a cast iron manifold - but mine simply would not stay tight. YMMV.

10-12-2011, 12:15 PM
F manifold is 27 ft-lbs. 2F is 33 ft-lbs.