Torque on Aluminum and Iron BB Heads - Team Camaro Tech
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post #1 of 6 (permalink) Old Aug 13th, 03, 10:02 AM Thread Starter
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Chris
 
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Location: Highland Village, TX, USA
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Is the amount of torque on Head bolts for a Big Block 454 for Aluminum and Iron Heads? I have 69 camaro with Canfield Aluminum heads and want to make sure, If I torque them diffrent then my previous iron heads. If so or not do you remember the sequence and final number for torque specs on Big Block heads?

Thanks,
Chris
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post #2 of 6 (permalink) Old Aug 13th, 03, 03:31 PM
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Torque generally applies to the bolt and not the material being fastened. Another genrality is that heads should be torqued in a circular pattern starting at the middle and working your way out toward the ends. It's also advisable to perform at least two passes. Say the spec is 80 ft*lbs. Torque first at about 60 and then final torque to 80. Don't ever take it to spec on the first pass. Three passes isn't over kill either (such as 50, 70, 80).

-dnult

Dave
========================
68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI
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post #3 of 6 (permalink) Old Aug 14th, 03, 05:22 AM
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Jeff
 
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The torque specs are different for aluminum, and I believe the short bolts have a different torque value than the long ones on each head, I can't remember and don't have my Big Block Chevy book handy. Also, if your using ARP headbolts, they may recommend a different torque value depending on what type of thread sealer you use, so you need to be more specific on the head bolts, and what type of sealer your using. Also, you MUST use washers on the headbolts for aluminum heads loaded with moly lube under the bolt heads and the other side of the washer that touches the heads.
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post #4 of 6 (permalink) Old Aug 14th, 03, 06:03 AM Thread Starter
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Chris
 
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They are ARP Head bolts, it sounds specific so I definitely need to give Canfield a call before I torque the heads down.

Thanks,
Chris
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post #5 of 6 (permalink) Old Aug 14th, 03, 07:01 AM
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Bret
 
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I would suggest you contact ARP because as stated it depends upon the fastener and sealant/lube used-not the specific head type/material.

Bret

http://www.arp-bolts.com
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post #6 of 6 (permalink) Old Aug 14th, 03, 11:45 AM
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Jeff
 
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Chris, I just put a set of aluminum heads on my 350, Edelbrock spec sheet said 65# torque, but when I talked the people at ARP, they said torque to 62#. It has to do with the fact that the ARP head bolts are made of a better grade steel than stock, and ARP rates their fastners by PSI. I used Permatex Thread Sealer with Teflon, which is similar to the ARP sealer they recommend, that combined with their fastners calls for lower torque. Bottom line, please check with ARP and the head maker.
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