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How big of a cam can I stuff in a 69 429 with c9ve heads?
Valve guide height for sure and probably the spring seat for a double spring if you want a cam with more than .535" or so valve lift.What needs to be machined?
Not unless you are floating the valves ... or, the retainer sets-up tighter than stock.Even at .530 lift it will crush your valve stem seals.