Page 1 of 2 12 LastLast
Results 1 to 10 of 17

Thread: Head Bolt Torque

  1. #1
    Trouble Maker
    What is the sequence and torque for a big block (502) with alumium heads???

  2. #2
    Trouble Maker
    Does anyone at least know the torque for a set of aluminum heads??

  3. #3
    Depending on the bolts, Stock or ARP???? A 7/16 head bolt torques to 70 foot pounds. I've had aftermarket bolts go more so ... As for how, start at the center and work out in a square pattern "center toward ends". I will torque in intervals, starting around 50 pounds first then follow back to 70. You just have to remember alum heads flex more as you tighten them down. Be safe though and chek with the head manufacture first. I've built a chit load of alum head engines this way and never had any problems. But im sure someone has a different theory on this. :notam:

  4. #4
    Trouble Maker

  5. #5
    My Big Block Chevy source book doesn't include the 502 as it is an older book, but it makes no distinction on torques for the MkIV blocks Aluminum or Iron headed.
    Long bolts, 75 pounds
    Short bolts, 65 pounds, all coated with silicone (they are in the water jacket)
    Studs, long, 65 pounds
    short, 55 pounds
    Valley studs for aluminum heads, 50 to 55 pounds. (the only distinction)
    Again, all siliconed

  6. #6
    Sequence is from the center bolts out, on both sides, the last bolts being the ones on the outer corners.
    Center bolt first, center shortie by the exhaust next, then the pair to the rear, then the shortie near the exh fwd of center, then the next pair to the rear from Exh inward. Then the pair fwd, from exh inward, then both the outer exhaust shorties, then the aft inner bolt followed by the fwd inner one. Lastly the aft pair (inner first) followed by the fwd pair.
    Hmmm Center, center exhaust, center aft, next to center aft exhaust, next one fwd exh, center aft then exh below, next exh fwd then center above, next aft exhaust, next fwd exh followed by fwd above, rear pair, inner first, lastly fwd pair exh first.
    I don't know how to throw extra studs in but is still basically "center staggered to the ends". I'm having ZERO trouble with my recently rebuilt 454, iron heads here.

  7. #7
    Wicked Performance Boats
    Gen5or6 bolt torque is 80 lbs on all headbolts, alumium or steel. No sealant,only oil, they go into blind holes Budlight

  8. #8
    Cool. The older Mk IV blocks put all the bolts into the water jacket. :shift:

  9. #9
    Wicked Performance Boats
    That's the main problem. That's why I use studs. Budlight :idea:

  10. #10
    Trouble Maker
    Thanks for the info guys...much appreciated!!

Page 1 of 2 12 LastLast

Similar Threads

  1. Bolt torque specifications for GM ZZ 572
    By spectras only in forum Gear Heads
    Replies: 2
    Last Post: 07-11-2007, 02:12 PM
  2. Berk Intake bolt torque....?
    By HotDogz in forum Jet Boats
    Replies: 11
    Last Post: 10-20-2006, 10:48 PM
  3. 455 Olds/Hardin Logs Bolt Torque Spec?
    By Avenger 1975 in forum Jet Boats
    Replies: 0
    Last Post: 07-10-2006, 08:30 PM
  4. Head bolt torque
    By BA Kurtis in forum Gear Heads
    Replies: 10
    Last Post: 05-30-2005, 08:25 PM
  5. Main bolt torque specs???????/
    By 396_WAYS_TO_SPIT in forum Jet Boats
    Replies: 3
    Last Post: 03-08-2003, 07:32 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts