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Originally Posted by PTAddict
I personally had a very bad experience with Speed O Motive. The 540 big block they built me had so many things wrong with it that it was impossible to believe. I ended up reusing only the block, crank, and rods, and had the rest rebuilt from scratch, after which the motor made 150 HP more.
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It's just like anything, there can be a lemon in everything. Like i said i know guys running them with no problems. When the 502 was the hot ticket a good friend of mine bought a ZZ502 and upon fireup and the first 5 min of run time it manage to throw a rod out the side of the block, never took it over 2000rpm. The only thing he put on was his carb he had bought. It happens.