While it's true that aftermarket hydraulic roller cams are more expensive than their flat-tappet cousins, by not having to purchase the lifters the overall price may actually be less expensive. This means that the yards are full of serviceable hydraulic roller lifters that can be obtained for pennies, leaving you more money to spend on camshafts, pushrods, and maybe a set of roller rockers. Because roller lifters don't slide and generate a wear pattern, you can reuse those factory lifters on a brand-new cam and no one will accuse you of being a roller bonehead. But happily, there's no such restriction when it comes to hydraulic roller components. If you've been reading the car magazines for a few years, then you've no doubt heard that you should not reuse old flat-tappet lifters and especially not with a new cam. The key to a successful hydraulic roller cam conversion is knowing what parts to use and which ones to avoid.
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