i would go atleast 70lbs on lower head bolts and 80lbs on top thats how i did mine anyway.

 

Thanks Raring. I notice that you have iron heads. Your torque settings should be right on for iron. Supposedly the expansion rate of aluminum means using a lower torque value. I'm not convinced though since other builds using aluminum heads, arp hardware and arp moly have gone with your torque figures. I'm trying to see if someone will tell me that I'm in for trouble (and why) by going with the lower torque setting.

 

by the way i just got through building my new motor. with afr heads and thats how i done them also. hope this helps. good luck.

 

I torqued my AFR's to 70 ft. lbs.

 

Toyota torque on some of the aluminum heads is way over 125 lb/ft. They are actually torque to turn, but if you were to put a number on it, they would be very high.

33lb/ft plus 1/4 turn, plus 1/4 turn, for example. That requires a breaker bar. Toyota heads arent stronger, nor is the head bolt.

 

Raring, Brian, JNMA thanks for the comments. If anything, I risk easier gasket blowouts by having the torque low. And the way I'm driving (with new headers, pulleys, shift kit, steeda running gear, etc.), I'm definitely high risk

 

I torqued my aluminum AFR's to 70lbs on the bottom and 80 on the tops and torqued in 4 stages...

Top-30,50,70,80

Bottom-30,50,70,75 (70 is fine just as well...)

 

Toyota runs more head bolts and suffers less from the exteme distances between bolts with the smaller bore than the typical 10 bolt head ford.

Because the aluminum head "grows" more at temperature, the amount of gasket clamp under load is usually greater with an aluminum head than a conventional iron head. The concern with excessive torque in the initial load is distortion of the clamping force crushing the gasket material beyond its "elastic" limit and actually inducing a head gasket failure.

On REAL top end stuff, depending on the amount of residual heat across the head, there are actually varying torque values for each bolt of each cylinder depending on its location.

The 385 web board has listed the additional and subtracted bolt torques used on top end pulling motors several times.

About the only time you get away with going to the high end of the fastner capability is when your dealing with a solid gasket.. ie a copper (leak prone) headache.

After the introduction of the MLS gaskets, Cometic being near extraordinary, the reason to use copper is nearly zero.....