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Re: 509 2 bolt 400
I have built a few of these. Only one ever had a probelm. The last 406 short block I built was originally for my personal truck but the truck was stolen so I traded the short block off. Was a forged internals, balanced setup with flat tops. Guy I traded it to sold it to a customer of his. They put a set of milled heads on it to get 13.1 out of it and a big solid roller. Then tossed on a small kit and first time they sprayed it it lifted the heads. It litterally pulled the head bolts and threads/thread bosses right out of the block. I have sence read that this is common when you push factory 400 blocks to or above 600hp. I'd say it your 550hp or less go for it but if your goning to be getting close to 600+hp I wouldn't waste the money on a factory block when something like the SHP block is so cheap.
Jay
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