Still no lifters (adjusters are not lifters in the true sence of what a lifter is and how it functions).....Roller Rockers ride on the cam and actuate the valves. At least that's the way all single ohc engines that I'm familiar with operate. That goes back to my days of working with Offenhausers. I've been working on and building race engines since I was 16. I don't make statements if I don't know my facts.