Has to be tough to produce the required precision and quality necessary for a roller cam and lifters at an affordable price. It's a very precision and complex system compared to HFT. Factory can do it because they make them by the millions and can demand the best materials and machining.
Kind of like HFT lifters ... yet to see an aftermarket lifter than can compare to a 60's or 70's OEM NOS HFT lifter when it comes to the precision of machining, the finish and the materials used.
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