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Originally Posted by priobe
Compression is 9.5:1
Bore and stroke is stock std bore & std crank 427
Side pipes are lobak from EM
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A standard bore and crank and your CR is 9.5 to 1? Well, I think what I would do to increase power on an otherwise nicely running 427 is start with the most minimally invasive procedures and work back from there before even thinking about taking parts of the engine out (I think your cam is probably fine). First, have your engine tuned properly on a chassis dyno -- this alone can pick up a significant amount of TQ & HP. Second, examine your sidepipes. I don't have personal experience with Lobak pipes but, if they're reasonably quiet, then they're robbing you of performance. After you've looked at those two things then my next step would be head work (but that starts to get slighly invasive). I tend to think the first two will probably suffice. On the off-chance that your "standard bore and crank" means that 427 has never had its short block touched, then you have a wonderful opportunity in front of you.