Size of crank-to-flywheel bolts??
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From: Rocky Mtn thin air & snow...
Size of crank-to-flywheel bolts?? I need to find out if anyone can tell me the size of the bolts that fasten the flywheel to the crankshaft. I've found a reference to them in the thread below, but just referencing the "11mm" bolt head size does nothing to account for length & thread pitch.
https://ls1tech.com/forums/conversio...-buy-them.html
I've also searched, but virtually every thread I've found is asking about the bolt that holds the balancer/crank pulley on..
If anyone happens to know that, I'd appreciate it if you could share it with me, since not knowing that is currently holding my project up...
EDIT: I guess the only thing that I really need to know is, what's the thread pitch for those bolts?? I can measure with my micrometer & get a pretty good idea of the length, but I don't think I have any way of getting the thread pitch - and it appears that I may have stripped one of those holes out...
Thanks in advance.
https://ls1tech.com/forums/conversio...-buy-them.html
I've also searched, but virtually every thread I've found is asking about the bolt that holds the balancer/crank pulley on..
If anyone happens to know that, I'd appreciate it if you could share it with me, since not knowing that is currently holding my project up...
EDIT: I guess the only thing that I really need to know is, what's the thread pitch for those bolts?? I can measure with my micrometer & get a pretty good idea of the length, but I don't think I have any way of getting the thread pitch - and it appears that I may have stripped one of those holes out...
Thanks in advance.
Last edited by V8Rumble; May 28, 2013 at 07:07 PM.
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From: Rocky Mtn thin air & snow...
<SMH> Holy crap, I should've thought of that!! 
OK, went to Summit, called up the ARP bolts, and...
http://www.summitracing.com/parts/arp-330-2802/all
...it says 11mm x 1.5 (presumably inches). OK, well, if ARP doesn't list it, let's see if GM will!
http://www.summitracing.com/parts/na...make/chevrolet
Great... Another "11mm x 1.5"... The other alternative is '7/16-20 in. RH' which I suspect is the same thing...
Well, at least I have something to investigate now, thanks for the great suggestion.
OK, went to Summit, called up the ARP bolts, and...
http://www.summitracing.com/parts/arp-330-2802/all
...it says 11mm x 1.5 (presumably inches). OK, well, if ARP doesn't list it, let's see if GM will!
http://www.summitracing.com/parts/na...make/chevrolet
Great... Another "11mm x 1.5"... The other alternative is '7/16-20 in. RH' which I suspect is the same thing...
Well, at least I have something to investigate now, thanks for the great suggestion.
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From: Rocky Mtn thin air & snow...
It appears that one of the six bolt-holes at the rear of my crankshaft has stripped out...
I appreciate the (implied) offer, but I actually have a decent set of bolts...
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From: Land of the Mormon's although I'm not one of them
Best bet is a heli-coil or threadsert, and with a crank, personally, I'd have a machine shop do it.
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From: Rocky Mtn thin air & snow...
Originally Posted by 97FormulaWS-6
Best bet is a heli-coil or threadsert, and with a crank, personally, I'd have a machine shop do it.
But honestly, if I have to pull the crank & pay a machine shop to fix it, that's JUST ABOUT enough reason for me to start wondering why I shouldn't just drop a new 4" stroker crank in there... (I know it would cost more - but I'd sure feel better about it!) I just haven't done any research on those, so I don't know if there are any out there that would still work just fine with the stock rods, etc...
Thanks for all of the feedback guys.
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