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I am converting a 71 351w block to hydraulic roller cam. I ordered everything from comp. cams including the cam {small base circle} and retro kit {the rail and guides}. The problem I am running into is that the guides {or H-bars} which keep the roller lifters from turning in their bores do not sit on the lifter bore { they sit about 1/8th of an inch higher than the lifter bore}. The problem with this is the lifter collide with the guides on their way up. I sent the cam back to comp cams and they said the cam was in spec. {also, I forgot to mention that I already ground down the casting numbers in the lifter valley as per instructions}. When I received the cam back, well, you guessed it, the retainer still placed the guides too high above the lifter bores. I have sent the retainer itself back to comp cams for them to check out. Anyone else have this problem? Thanks Mikey
 
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