Quote:
Originally Posted by r0nin89
Ughh I thought cinder/concrete block tech was commonly know. Never stack the blocks ANY way other than the face youd see them in a foundation.
I found this out the hard way at my buddys house. He threw a block under the back of the truck and mid axle drop out it let go. The truck was teetering on the 3 jack points that remained with me under it. That was scary...
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The compressive strength of concrete is around 4000 psi. The compressive strength of cinder block is around 1250 psi.
With a car or especially with a truck, you can get close to 1250 psi. Figure the weight is spread out but comes to a point at each wheel. If you throw a cinder block under a rotor(!) or something like that then the weight gets concentrated.
Skip the block. Do it the right way.