05-18-2011, 02:48 PM
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Senile Club Cobra Member
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Join Date: Feb 2001
Location: Buffalo, NY USA,
NY
Cobra Make, Engine: Superformance
Posts: 4,566
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Not Ranked
The bolts used on the Ford flywheel are called "place bolts" and have the shallow castellated heads. The head is slightly undercut on the mating side so when torqued the head goes very slightly concave to work as a locking system.
info here: Aetna - Place Bolts, Locking Place Bolts, Hex Head Locking Place Bolts, Six Slot Hex Head locking Place Bolts, GM Type AA Place Bolts, Slotted Bolts, Slotted Hex Head Place Bolts Grade8
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rick@autoventureusa.net
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