torque-to-yield bolts query

Moparteacher · 10-31-2008, 01:25 AM

TTY fasteners are usually used where an aluminum part (cylinder head ) is being fastened. Aluminum expands and contracts greater than cast iron. This expansion requires a bolt that will stretch and retract while maintaining clamping force.

I doubt your 454 utilizes TTY bolts if it has iron heads. Are the heads iron?

Ken Haase · 11-02-2008, 02:42 AM

Yes, Gary, the heads are iron. And, my recollection regarding the appearance of single-use bolts is that they are dull looking, almost like they have been bead blasted. Am I correct on that?

I was disappointed that these Gen VI head bolts still go into water, unlike the aftermarket blocks.

Thanks for the reply. Ken

10-31-2008, 01:25 AM	#1
Moparteacher Junior Member Join Date: Nov 2007 Location: Boise Posts: 49 Likes: 0 Liked 0 Times in 0 Posts	Re: torque-to-yield bolts query TTY fasteners are usually used where an aluminum part (cylinder head ) is being fastened. Aluminum expands and contracts greater than cast iron. This expansion requires a bolt that will stretch and retract while maintaining clamping force. I doubt your 454 utilizes TTY bolts if it has iron heads. Are the heads iron? __________________ Gary Weaver Moparteacher@yahoo.com

11-02-2008, 02:42 AM	#2
Ken Haase Member Join Date: Mar 2007 Posts: 233 Likes: 0 Liked 1 Time in 1 Post	Re: torque-to-yield bolts query Yes, Gary, the heads are iron. And, my recollection regarding the appearance of single-use bolts is that they are dull looking, almost like they have been bead blasted. Am I correct on that? I was disappointed that these Gen VI head bolts still go into water, unlike the aftermarket blocks. Thanks for the reply. Ken

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