How tight should I torque my intake bolts on my TPI intake?? The books I read and info I read says 30-35 ft lbs ... but they don't specify aluminum or not. I heard that you're not supposed to torque aluminum intakes to more than about 25 ft lbs. Some of you guys who have done this plz let me know how much torque I should use. Thanks in advance.

 

86,

Which bolts? The bolts that fasten the intake base to the heads are actually threading into cast iron heads, not aluminum. They should be torqued at 30-35 ft/lb. The balance of the fasteners for the TPI plenum, runners, and throttle body should be torqued at 18 ft/lb.

Of course, all fasteners should have clean threads with a light coating of oil for cast iron, and a liberal coating of anti-sieze compound for aluminum.

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Later,
Vader
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Thanks Vader. I was thinking that since it was threading into the heads that it was still supposed to be 30-35 ft lbs but my friend said otherwise. I'll have to correct him.

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1986 Trans AM
305 TPI
Well over 200,000+ miles (speedo/odometer non-funtional! Odometer reads 142,000)
4 Wheel Discs
9 bolt Borg Warner Rear (2.77's....oh joy) :P
Completely Stock
Current Project: upgrade to a 355 TPI, 6" rods, 9.7:1 Compression, Stock TPI ported, 24#/hr LTI injectors (cleaned and flowmatched by Cruizin Performance), Hedman Shorty Headers, 3" exhaust with 80 series flowmaster, SBC 993 heads completely redone and modified for 1.6 RR, Comp Cams XE262-14 TPI Cam, Holley AFPR, TPIS airfoil, MSD wires, MSD 6-AL Ignition, Hypertech hot coil.

 

I heard 42 and I did mine that way.

 

Not sure what over torquing can do but I think you might have over-torqued yours. About three differnt resources I read said 30-35. *shrugs*

 

Oh, I know what over torquing can do. Lets just say my super pain in the *** intake has a lot of heliocoils

Brendan