239 Flathead Head Bolt Torque
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Tuned
Joined: Nov 2017
Posts: 303
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From: Cicero, IN
239 Flathead Head Bolt Torque
I am replacing the head gaskets on my 1953 239 flathead. The manual shows the correct sequence for torquing the bolts. Is it recommended to immediately torque the head bolts to 65-70 lb-ft, or should you first torque the bolts to a lower level before repeating the procedure to the final torque?
Phantom of the Phorum
Joined: Jan 2011
Posts: 5,472
Likes: 1,696
From: Kentucky
I was taught to torque in steps. I always start with about 40-45 then 50-55, then finish with the required spec.
I also check it again after it's been at working temperature a couple of times, then again at about 100 miles.
This is the way I was taught, your mileage and research may vary.
I also check it again after it's been at working temperature a couple of times, then again at about 100 miles.
This is the way I was taught, your mileage and research may vary.
Hotshot
Joined: Oct 2009
Posts: 16,191
Likes: 4,800
From: Burbank, WA
Sneaking up on the final torque in stages allows the clamping force to come down more evenly and reduce the chance of warping things. The block deck on a flat motor is pretty thin and can use all the help to stay straight it can get.
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