Re: head torque spec? I got 3 different answers....
[Re: dssaa]
#629402
03/03/10 01:48 AM
03/03/10 01:48 AM
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Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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I would not be afraid of 100. My 67 "glenns" shows 85 for a SB and the SA design stroker bible shows 95 for stock 1/2-13NC head bolts probably due to only 10 head bolts per side (SB). I would go in a half dozen steps (doesn't take that long)once you get in a rhythem which (multiple steps) gives you more clamping force in a more even gradual pattern over the head area.
live every 24 hour block of time like it's your last day on earth
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Re: head torque spec? I got 3 different answers....
[Re: RapidRobert]
#629403
03/03/10 02:44 AM
03/03/10 02:44 AM
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Joined: Dec 2003
Posts: 5,314
Carstairs, Alberta, Canada
dave571
master
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master
Joined: Dec 2003
Posts: 5,314
Carstairs, Alberta, Canada
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Quote:
I would not be afraid of 100. My 67 "glenns" shows 85 for a SB and the SA design stroker bible shows 95 for stock 1/2-13NC head bolts probably due to only 10 head bolts per side (SB). I would go in a half dozen steps (doesn't take that long)once you get in a rhythem which (multiple steps) gives you more clamping force in a more even gradual pattern over the head area.
Big block bolts aren't 1/2 inch. That's why 100 would be foolish.
AND unnecessary, since there are 17 per side, instead of 10 on a SB. The torque is spread out very evenly, and head gasket failure is virtually non existant on these things.
I'm not sure how you would make it into 6 steps. I've done it three before, but even that seemed unnecessary(factory spec is two steps) When the steps get too short, you don't get a clean sweep on the torque wrench, which makes the torque reading questionable. A short jerk on the wrench is not accurate. The bolt needs to turn in clean even motion for a good reading. 
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Re: head torque spec? I got 3 different answers....
[Re: RapidRobert]
#629405
03/03/10 08:01 AM
03/03/10 08:01 AM
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Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1
Too Many Posts
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Too Many Posts
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
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Quote:
I would not be afraid of 100. My 67 "glenns" shows 85 for a SB and the SA design stroker bible shows 95 for stock 1/2-13NC head bolts probably due to only 10 head bolts per side (SB). I would go in a half dozen steps (doesn't take that long)once you get in a rhythem which (multiple steps) gives you more clamping force in a more even gradual pattern over the head area.
BS
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Re: head torque spec? I got 3 different answers....
[Re: lokalik]
#629407
03/03/10 10:39 AM
03/03/10 10:39 AM
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Joined: Sep 2005
Posts: 12,481
Chino Valley
RodStRace
I Live Here
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I Live Here
Joined: Sep 2005
Posts: 12,481
Chino Valley
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70-75 460 fords use 100+, but I wouldn't pull a BBM that hard. I'd suggest finding a bolt torque chart that you are comfotable with and matches most of the specs for your engine and use that as a backup for numbers that don't seem right or have multiple specs. Example: http://www.portlandbolt.com/technicalinformation/bolt-torque-chart.htmlAs ARP and others will tell you, the threads, lube and wrench all change the reading, so the most important thing is to get them all even. The second important thing is to get them to the right clamping force. That's where the chart comes in. That is the typical clamping for the fastener, and as you can see, there is a difference depending on grade/material.
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