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Originally Posted by kilrcam
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.
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If you do a search for Speedomotive on most all car sites you will find more horror stories than you can imagine. I'd say 10:1 bad to good. I have my own story about them but I don't feel like typing it out. I would avoid them like the plague.
Any company that sells you a 750 HP big block "dynoed" engine and will not guarantee it makes even within 50% of that (plus doesn't dyno them anyway other than on a computer program) does not get my vote. The amount of poor machine work, balance issues, oil useage, etc. will amaze you.
Jody