Make your own and you can save a few bucks and have fun fabricating them. I used 1.5x3 in. box tubing. I welded 1/8 in. plate to each side to resize it to 1.75x3. Ground the welds down then cut the blocks to 4 in. length (I made one long piece to start out with). Find the center by scratching the metal with a set of dial calipers on the top and bottom. Drill a 1/2 in. hole in the bottom and 3/8 in. hole in the top. Bolt a 1/2 in. axle bolt in the top 3/8 in. hole then cut it down to a height of 3/8 in. and put a small radius on the edges. You'll have to get some longer square bend u-bolts. I looked at a trailer supply shop but the longest they had was 5.5 in. I went to a spring shop (in Kansas City General Spring or American Spring) and they bent 1/2 u-bolts while I waited for $8 a bolt which included thick washers and tall nuts. Install and torque to 65 ft/lbs. I didn't capture pics of every step but here are a few. The last show my cars stance with 3 in. blocks in the back and 2.5 in. dropped uprights in the front. The first pic shows the dimentions of the blocks available from Chevy's of the 40's, which is where the pic is referaced from.
Made mine for my '47 Chevy PU out of steel and boxed the ends, then ordered U-bolts, fun project, and simple.
I've had the cast aluminum "cinder block" style ones from Poop Boys crumble and fail... poor quality casting, zero QC, probably some factory in China making them for 5 cents on the dollar. /2 cents ( <-- almost enough to get some blocks)
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