Pettis Performance 598ci Race Engine - Big, Wild, & Nasty Part One Photo Gallery
"We found that when we add a large-body lifter with the larger 55mm camshaft the oil flow to the lifters is affected. We modify the bushings to get ample oil flow to the lifter. The alternative is to modify a set of lifters, but who wants to do that to a brand-new set? This way you drop 'em in and forget about 'em," commented Pettis.