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With all this bashing and negativety about a product I'd thought I would post a possitive report. A customer in Texas has an XR1 block, W-7 heads by Visner with turbocahrging. 1300 at the rear wheels. The math works out to something like 1500+ at the crank. Pretty good amount of power handled by a block everyone seems to like to throw under the bus. The point being these are good blocks.
. This is the block with the head studs in the wrong location and had to be moved. Blocked leaked water into 3 cylinders all weekend long. Engine is apart now to try and repair the problem. Not sure who's fault it is but no for a fact it was the block. 
2010 Toxic Orange Challenger built by B and B Racecars! All aluminum R4/P5 engine, Proformance TH400 (3 speed) tranny, full Reid case, nodular 9" rearend, full Dragpak suspension, Protorque custom converter, BS3, PTE 85mm turbo, fire core wires, carbon doors, carbon front clip, and a whole lot more!
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