According to their chart, the proof load for a Grade 2, 1/4in bolt is 55,000
psi.
Accounting for the threads and using an approximate diameter of .2in, the
grade 2, 1/4in bolt should support 1700lbs without deforming.

That is only one bolt and it's a small diameter and a low grade.  So these
should work fine to support an engine, assuming the threads don't fail.

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Rob
Sent: Saturday, October 17, 2009 3:57 AM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Friday - engine stand suggestions

http://www.boltdepot.com/fastener-information/Materials-and-Grades/Bolt-Grad
e-Chart.aspx
Talks about bolt strength. What you have been doing works, <shrug>  I
can't see a problem.

Rob
becida@comcast.net

> > Jim