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 Flexplate Stretch Bolts????

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designer1962
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designer1962

Name : Harvey
Age : 76
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Flexplate Stretch Bolts???? Empty
PostSubject: Flexplate Stretch Bolts????   Flexplate Stretch Bolts???? EmptyWed Aug 08, 2012 12:34 pm

Finally have the engine in my Riv. (Haven't started it yet) The installer says he had to get some "stretch" bolts for the flywheel. I have never heard of "stretch" bolts before, but they appafrently are real.(googled it) What got me was the cost. Should such a bolt cost $45 each? Are they gold? And only available from a GM dealer?

Just like to how badly I get screwed (No pun intended) when it happens.

Thanks for any info.

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AA
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AA

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PostSubject: Re: Flexplate Stretch Bolts????   Flexplate Stretch Bolts???? EmptyWed Aug 08, 2012 12:55 pm

They're real, but the $45 ea price isn't. They're about $27 for a set of 8 from the dealer. I just bought a set last month.

INTENSE Racing sells a set made by ARP for $20: LINK ARP makes some of the best quality fasteners on the planet.

Installation: use RED thread locker. Apply 11 lb-ft with a torque wrench, then apply an additional 50º of turn to stretch the bolt. You can eyeball this as between 1/8 and 1/4 turn.

_________________
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designer1962
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designer1962

Name : Harvey
Age : 76
Location : Baltimore, MD
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PostSubject: Re: Flexplate Stretch Bolts????   Flexplate Stretch Bolts???? EmptyWed Aug 08, 2012 8:25 pm

Aaron,

Thanks. We are never too old to learn something new! Now I know what a stretch bolt is. First time in my 68 years I've ever run across them.

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albertj
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albertj

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PostSubject: Re: Flexplate Stretch Bolts????   Flexplate Stretch Bolts???? EmptyWed Aug 08, 2012 9:00 pm

designer1962 wrote:
Aaron,

Thanks. We are never too old to learn something new! Now I know what a stretch bolt is. First time in my 68 years I've ever run across them.


just as an FYI the other almost-universal app for stretch bolts is cylinder heads.
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LARRY70GS
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LARRY70GS

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PostSubject: Re: Flexplate Stretch Bolts????   Flexplate Stretch Bolts???? EmptyWed Aug 08, 2012 9:45 pm

Otherwise known as Torque to Yield bolts.

http://en.wikipedia.org/wiki/Torque-to-yield_fastener

_________________
98 Riviera SC3800  All stock except gutted air box.
1970 Buick GS455 Stage1, TSP built 470BBB, 602HP/589TQ
Best MPH, 116.06 MPH, Best ET, 11.54
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