Flexplate Stretch Bolts????

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.

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.

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.

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.

Otherwise known as Torque to Yield bolts.

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