Engine mount bolts!!!
Thread Starter
Racer
Joined: Jul 2005
Posts: 387
Likes: 3
From: Indian Trail, NC
Engine mount bolts!!!
Hey guys! I'm in a bit of a jam. I'm close to being ready to throw my new engine back into the car, but I'm missing the 2 long through bolts that mount the engine brackets to the engine mounts. I went out and got 7/16-14x5" bolts (that's what it looked like), and it doesn't seem quite like a match. The nut is sloppy on the bolt, and the bolt itself is extremely sloppy in the bracket and mount. Any and all help is greatly appreciated. If there is anyone that has a spare set of these bolts, PLEASE, PLEASE PM me. Thanks again! 
Thread Starter
Racer
Joined: Jul 2005
Posts: 387
Likes: 3
From: Indian Trail, NC
Hey Jake. The bolts actually aren't metric (at least i can't picture them). The reason why I say that is because the original nut that came off of the original engine mount bolt will thread onto the new bolts I just got with no problem, and the bolts I got are 7/16-14. But again, the nuts are sloppy as hell on the new bolts, and the bolts are even more sloppy in the mounts. 
Year is a 1992...
Thanks!
Year is a 1992...
Thanks!
Last edited by farscape1a; Dec 12, 2006 at 05:33 PM.
Thread Starter
Racer
Joined: Jul 2005
Posts: 387
Likes: 3
From: Indian Trail, NC
It's actually a custom cam matched to the head and intake manifold work that was done. The owner of the company asked me to not disclose the specs of the cam, and I'm going to respect his wishes. The only thing I have to say is that it's pretty damn lumpy.
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
GM loves to play games with the bolts and nuts.
Jake
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Team Owner
Joined: Oct 2004
Posts: 81,241
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From: altered state
St. Jude Donor '05
)Id get the factory bolts, but I just HAD to have pretty hardare
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,063
From: altered state
St. Jude Donor '05
Ok, got it. May not be the same as L98s, but once you get both sides on they will be tight once you actually drop the motor in. clamshell holes are oblonged a bit, mounts arent. It works. No metric on my USA muscle!
Wouldnt surprise me a bit if the L98 stuff is. Dont get that, its an American car
Wouldnt surprise me a bit if the L98 stuff is. Dont get that, its an American car
Thread Starter
Racer
Joined: Jul 2005
Posts: 387
Likes: 3
From: Indian Trail, NC
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
The only reason I've read is that there was a BIG move to change the U.S. to the metric system years ago, but it failed. In the process there was to be a gradual transition from SAE and NPT to metric.
I still don't know why GM (and maybe others as well) continue with this mixture of different types.
Jake
I still don't know why GM (and maybe others as well) continue with this mixture of different types.
Jake
Thread Starter
Racer
Joined: Jul 2005
Posts: 387
Likes: 3
From: Indian Trail, NC
Hey guys! I just got the bolts I ordered for the mount in the size M12x1.75x80 as Divette mentioned. They're way short. But, the diameter and thread pitch are correct. They have to be about 120mm in length. Just FYI for anyone else in my situation! Enjoy! Thanks for the help!
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
According to the info I have, 10.9 Metric is the highest class used on our Vettes and Grade 8 the highest in the English. The strength of the bolt will be embossed on the head - in numbers for Metric (4.6, 8.8 etc) but little lines for the English system. Six hash lines indicates a Grade 8 bolt.
So I'd say that if you have a Metric bolt stamped 10.0, it's pretty close to Grade 8. Or to say it another way, a Grade 8 bolt is probably slightly stronger than a 10.0
Jake
