Ive been through 3 or 4 cam grinds on my 540 before settling in with the solid roller that Harold hooked me up with. Whats amazing about these big inch engines is how they swallow up what appears to be big cam profile numbers and have decent street manners. My engine is a 10:1 with the big port heads from Mitchell ported by CFM and a 4-speed. The grind is a 50299LUN .685/.680 lift and the duration at .050 is 255/264 on a 110 center. This thing scares me from time to time, ran up to 127mph through the trap cant hook it up but it sure is fun, and revs up real fast. Do yourself a favor and purchase a high quality roller lifter especcially if its gonna be a long distance cruiser along with some high quality springs, the rollers require some ridiculous spring pressures.
Frank made a good point regarding the lobe center, spreading them out to 112 or 114 will increase the vacuum signal at idle and improve its overall street manners. I dont think you will have a problem tuning the engine with the xfi system down to a center of 110. Mine idles at 900 and seems pretty calm. If you can get in touch with Harold Brookshire he is a great source to speak with regarding camshaft design, his history is amazing real interesting to speak with. Let us know what you end up choosing.
Rich
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