i need help w/duster engine

That's not what I see on the Doug Herbert web site. Hydraulic rollers, yeah sure, the wheel is much smaller in diameter than a mechanical roller is. And that's the only way you'll get a full bodied roller lifter in there. Same for the springs, hydraulic rollers yes, but if there are springs that are going to handle a radical mechanical roller cam at 1.65 installed height please show them to me. I'd like to see the lifters too if you know who sells them.