[Keithc8]

We do quite a few 427SBF with about 10.5 to 1 compression, hydraulic roller camshaft in the 246 to 260 duration range @ .050 with about .560 to about .600 lift. We use a AFR 205 or our KC Signature 195/210 heads with a Victor JR and they make 575 to 600HP quite regulary.
These engines are a complete process of machine work and parts. There is a reason why some of us own 2 million in machinery to have the best CNC equipment, best Sunnen 50,000.00 cylinder hone to get the cylinders with in .0005 of roundness and straightness. What is the deck heights on the engine, what are the ring gaps, what rings are you using, what are the bearing clearances, how is the camshaft installed and on and on. Our blocks are blue printed which means the bores are in the right bore spacing location and are 45 degres to the center of the camshaft and crank center line. Just way more stuff than most people understand and it is all done to each engine and these are just a few things that make some of these engines make more HP than some of the other stuff you see. The heads work is also something that most shops have no clue about. They do not even own a flow bench or test different valve jobs for flow or port designs.
If it was easy everybody would do it and with engines about everyone tries. There are certain things that I do not do because I know that there are better poeple that are qualified to do the job. I am not going to try and do brain surgery on my child or build a missile. Now there are a lot of things that I can do but do not have the time to do them and I do better working and making money doing what I know how to do and then pay them to do the other stuff and it works out for everybody.
Good luck with that engine stuff it is a pain it the ass, I should know I have been at for about 30 years now.

Keith Craft