Aluminum 427 head and intake torque specs

[thorconstr]

Anybody know of a web site with bolt tightening and torque specs for a aluminum 427 SO? Head & intake specs and sequence? Many thanks in advance.

[Anthony]

For their aluminum heads, Edelbrock recommends 25 ft-libs for intake, and for head bolts - 110 ft-lbs top row, and 100 ft-lbs bottom row.

Sequence for torquing heads is start at the middle top bolt, and then middle bottom bolt, and tighten bolts in a spiral sequence going outward, tighting bolts in several stages, like 40 ft-lbs, 60, 80, and then final settings.

you want to tignten the intake bolts on opposite ends of the intake, like tightening wheel lug nuts. Start with the middle two bolts, then do the end opposing bolts, then the intermediate bolts.

[ERA Tom]

Al, are you using head bolts or head studs? Torque is different for each. Either way, be sure to drop your distributor in while you tighten the intake bolts to prevent shifting of the manifold which can cause misalignment of the distributor bore.- Tom

[thorconstr]

Tom, I'm using ARP studs. Thanks for the replies.

[ERA Tom]

Al, check the instructions that came with the ARP studs for correct torque, or call ARP. I'm pretty sure that the torque is somewhere around 85-90 ft lbs for studs using ARP lube, compared to 110 ft lbs for bolts. I'm told the reason for the difference is that the clamp load of a stud is much greater than a bolt and does not require as much torque. The torque pattern remains the same.

[Michael C Henry]

Go to the top under Member discounts and link to George Anderson at Guessford Machine.He helped me with all this stuff .The ARP lube make a big difference .It's like nickle anti seize. The head bolts were coarse threaded into the block .The ARP studs are coarse threads into block but fine threads on top.

[thorconstr]

Thanks for the help!