OEM head bolt torque to 74 in/lb
 

Would it be wise to torque down the OEM header bolts to the recommended 74 in/lb or stay with the stock torque of 54 in/lb?:rolleyes2

The stock torque rating was always too low, resulted in the 7M getting a not totally undeserved reputation for bhg's. 72 is a much more reliable torque for the headbolts.

Inch Pounds ? Header Bolts? What?

That's what I was thinking....

rob87- If you mean ft/lbs and head bolts, then you are right. If you are talking about torque specs on the exhaust header, then I can't help you there.

:dunno: I figured he was talking about the headbolts from the title on the post and had just confused in/lbs with ft/lbs.

hold on are we talking head bolts or header bolts? Because there 2 different things and the title says head bolts while u guys are saying header bolts!

Even so,I thought the stock head bolt torque is 58 ft/lbs not 54 and where do you get a number like 74. And there are no header bolts. There are studs though.

Factory Head Bolt spec: 58ft lbs
(ISO Standard IIRC) 12mm x 1.25 fasteners (bolts, not studs) and ARP's required torque: 75ft lbs
(ISO spec IIRC) ARP required torque for studs: 90ft lbs

Header fasteners: 29ft lbs

Valve cover screws: 22INCH lbs


With a retorque on an old HAG there is always the danger of splitting a brittle jacket and creating a cavitation prone opening where there was none previously. I've only ever heard a couple people discuss this happening to them though and the odds are remote. You may look at it this way: If it's a stock HG... it IS going to leak eventually. The retorque simply may buy you more time. If you accept the inevitable there's really not any down side. ;)

u knew what i meant just what is he talking about in relation to what ur talking bought

My bad guys. It's not in/lb but ft/lb. I was just wanting to know if the oem headbolts/studs can take a retorgue of 70+ ft/lb. I'm new at the supra engine, even though I've had my car for about 10 yrs. I haven't had to do much with it after I had the engine swapt out with a less mileage one until now.

Thanks for all the tips and corrections. This forum is great!!!!:dance: