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Old 05-26-2007, 01:27 PM
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Engine stand bolts

Hello,

About to remove Chevy 350 small block. Bought an engine stand - Question: What size(length) /type bolt do I use to secure the block to the stand? Thanks!

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Old 05-26-2007, 02:41 PM
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their a 3/8 coarse thread bolt. measure your engine stand & add about 1/2 or 3/4 more to it for the bolt length.
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Old 05-26-2007, 03:53 PM
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Make sure you use grade 8 bolts.





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Old 05-27-2007, 07:28 AM
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Quote:
Originally Posted by Rob Keller
Make sure you use grade 8 bolts.
R
Why,..??....

Grade 5s,.... or even grade 2s will hold a motor on a stand till 'ell Freezes over......
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Old 05-27-2007, 07:34 AM
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3/8th bolt 16 thread ( NC ) grade 8 bolts cost only a very small amount more ... When in doubt ... make it stout
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Old 05-27-2007, 08:11 AM
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Quote:
Originally Posted by bondo
Why,..??....

Grade 5s,.... or even grade 2s will hold a motor on a stand till 'ell Freezes over......
Yes they will, they will also snap off in your block.
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Old 05-27-2007, 08:33 AM
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We have used standard grade 5 bolts on engine stands for over 20 years. Never an issue.
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Old 05-27-2007, 02:46 PM
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Bigger is always better I M H O unless it comes to women.

It would be a real shame to have to replace your oil pan / valve covers {which ever way you got it turned} Because of a stupid bolt.

I use grade 8.


Grade 5 might be OK for the bell housing bolts because there are 6 of them & ... & motor mounts to hold the engine in place.

There is a lot of stress on the motor stand & the weakest point. again IMHO is the 4 bolts going from the stand to the block.

Grade 5 might work just fine but I would not use them again for the same thing.

Here is another piece of advise
Don't buy your bolts from Home Depot or Lowe's .




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Old 05-27-2007, 04:06 PM
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grade 5 will bend under high stress

grade 8 will break under high stress

in this case, grade 5 is actully safer.
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Old 05-27-2007, 06:24 PM
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bolts

I think it would be doubtful for 4 bolts to break. I even have one stand that only has 3 legs.
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Old 05-28-2007, 07:42 AM
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Quote:
3/8th bolt 16 thread ( NC ) grade 8 bolts cost only a very small amount more ...
Ayuh,........

And Pennies will Quickly turn into Dollars..............

I'll still be using Gr5s..............
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Old 05-28-2007, 08:11 AM
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I recommend AGAINST grade 8 for reasons already mentioned. Grade 8 is superior in items of tensile strength; that is to say where the force is parallel to the length of the bolt. U joints, headers, axle brackets, wheel studs, etc. Grade 5 has a slightly lower tensile strength but its much more malleable. Grade 8s don't bend, they break. Grade 5s will bend and thats a good thing since most of your weight on an engine stand is shear weight... and the tensile strength of grade 5 is waaaay more than sufficient on an engine stand.

I used to think that more is better, but when it comes almost everything in the automotive world, RIGHT is better. Everything has its application, and hard brittle bolts like grade 8 have broken on me before in engine stands and engine lifting.

If you don't believe me, try lifting an engine with a long grade 8 bolt. It will break. But, if you have a shorter grade 8 bolt that you can torque down against the chain, it has a chance because its under tensile pressure and it gets shear strength from the fact that its wedged against the block and can't move. Now do the same test with a grade 5 and the long bolt will just bend.

That was my long winded way of saying; use grade 5 and you'll be happy. Use grade 8 and they'll probably last forever, but if you drop a box out of the rafters on the engine a grade 8 might snap, but a grade 5 will just deform. Ask me how I know. I had two grade 5s and two grade 8s in my Caddy 500 on the stand. The box of toys I dropped from the rafters sheared the grade 8s leaving the engine to hang on the mangled grade 5s.
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Old 05-29-2007, 07:11 PM
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Why not HD or Lowe's? Lowe's has Grade 5 & Grade 8 bolts if you look in the right drawer. I definitely would NOT use their standard stuff for anything other than loose ballast. I broke a 1/2" standard-grade bolt from a real hardware store with hand wrenches, and I didn't even use my feet.
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Old 05-29-2007, 07:43 PM
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I love that aisle of drawers at Lowes!!!! I swear I get half of my car parts at lowes these days
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Old 05-29-2007, 08:24 PM
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Heck, I found some 1/2"x20x3" Grade 8 cad-plated bolts to replace my constantly-breaking bathroom sink faucet handles in those drawers, not to mention some fender washers & felt mirror pads to cushion the door panel of my POS Cadillac from the deck screws that now attach the panel to the door. It's an "engineer"'s heaven, for sure.
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