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Hello gentleman, long story short just trying to see if anybody has had problems with higher horsepower, factory blocks plus 4" for a total of 8" of block in the rear..5/8 ubolt.."but I thought a GVWR of 10k would have had 3/4"

Street truck with the ocasional off road beat on..

1993 f350..640 hp...670 lb/ft...39' tires
 

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Hello gentleman, long story short just trying to see if anybody has had problems with higher horsepower, factory blocks plus 4" for a total of 8" of block in the rear..5/8 ubolt.."but I thought a GVWR of 10k would have had 3/4"

Street truck with the ocasional off road beat on..

1993 f350..640 hp...670 lb/ft...39' tires
If you're talking about lift blocks, any amount of blocks beyond a stock engine output is a no-no. Look at all the leverage you're putting on the spring package. If you want lift, lower the whole spring package at the frame mounts and build a spring package that is biased toward the front of the package. If you want articulation, go to a diagonal 4 link set up and coil overs or if you're going to stay with a leaf set up you can go with the fold over style shackle. I've seen as much as almost 24" of wheel travel with this set up.
Rob
 

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Stacking blocks of any type are never good, as was mentioned due to the leverage factor. If you really want to cheap out and not put in a taller spring pack, then get a single taller block along with some good u bolts and a traction bar setup. This way it wont try to spit the block any time you hit the throttle.
 

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I’ve never seen it happen but with more than one block, they can “spit” out. I would get one 8” block or better yet, more arched springs with more leaves. Or the rear shackle is easily flipped for I think 5”. So you could just use one block. Some factory Ford blocks have “ears” that surround the ubolts, so maybe find some of those. I’ve seen many over the years, heck, probably have some laying around.
 
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