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Why torque a oem almn head different than an aftermarket head? Is it because the better deck(thicker) seals w/o as much torque? 40ft/lbs seems light, especally on a race motor? What are you differing on OEM style vs aftermarket?

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I'am referring to the after market like an Indy head that has a bolt rather than a stud in the lifter valley.A bolt clamps differently than a stud,you are friction loading as well as clamp loading and may pull the threads as well as distort the floor of the intake.There is a redundency as far as friction loading with a stud and the stud thread hole in an OEM style is a through hole whereas the Indy is a blind hole and it's termination is part of the intake floor.

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I don't mean to hy jack, and this is the same topic.
What tool are you guys using for the valley stud twelve point nuts? I cannot find a 1/2" twelve point crows foot.

Mark

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Snap-on p/n FRDHI81. I use 9/16" 12 point nuts.

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Hmmm... mine are 12 point 1/2" inch. It is what comes in the ARP stud kit, 145-4003. I have not been able to find a 12 point crows foot in 1/2".
Thanks for the reply,
Mark

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I don't mean to hy jack, and this is the same topic.
What tool are you guys using for the valley stud twelve point nuts? I cannot find a 1/2" twelve point crows foot.

Mark

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Snap-on p/n FRDHI81. I use 9/16" 12 point nuts.

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Hmmm... mine are 12 point 1/2" inch. It is what comes in the ARP stud kit, 145-4003. I have not been able to find a 12 point crows foot in 1/2".
Thanks for the reply,
Mark

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I think Snap on has different sizes. My studs origianlly had 9/16 hex nuts so I replaced them with 12 points. Mac tools also had them. There called spline wrenches I think. Also, my part number was wrong. It's FRDH181

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Found it! "Torque adapter"
http://buy1.snapon.com/catalog/item.asp?...re=snapon-store

Thanks a bunch!

Mark

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