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Re: Camshaft type?
Just my 2¢, but for anything I'm building in the future I'm going to strongly lean toward a roller, or at least direct-lube lifters and a HV oil pump. Even if the block is a plain old 2-piece RMS, no-dogbone/spider, and 2-bolt with cast crank, I'll be wary of using a flat tappet. The removal of antiwear additives from most engine oils is going to make life very tough for flat tappet cams in the future. Even some of the truck oils are reducing or eliminating ZDP, sulfur, and baruim based additives. Roller-cammed engines don't care much, but flat-tappets are going to wear faster unless you are very careful about the oil or additive you use.
Beyond that, rollers offer the opportunity to have greatly increased ramps, so stupid-big lifts can be had with a reasonably short overlap, so street manners are a lot more easily maintained. Aftermarket rollers have been around for decades, and are probably actually better than the factory setup for rotation control.
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