I chose a safe route for my Ford 302 and got a 1,200-to-4,500 cam that wouldn't require new springs or have clearance problems. You will find that most cams give an RPM range idle-to-3,500, 1,500-to-4,500, etc. I have seen many a motor wrecked because of this not being checked. Stroke beyond a certain range and a big aftermarket rod or a rod of non-stock dimensions for a given motor, clearences are of major concern. As with cams, everything over a certain lift needs to have the spring checked for coil bind and valve guide issues. There are so many crank/rod/block combos out there these days, unless we know exactly what your gonna run and the part #'s, its hard to tell without checking. Whoever is doing your motor, if they're a experienced shop, tell them of your concern and should be able to set you at ease. rods run in those you gotta watch your cam clearence. If you gotta notch your oilpan rails and bottom of the cylinder webbing, you then might have to run a small base circle cam. If you do run those.I usually check everything with a 'Stroker Mimic', a setup where you check clearence, to make sure things are clearenced enough. On the cam clearence issues, you shouldn't have any UNLESS your running a BIG stroker setup, OR unless yur running BME alum. I wish a had a 10$ bill for everyone I setup.
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