SB Crane Retrofit Roller Lifter Issue

If you go to Hughesengines.com they have a story about lifter bores being chamfered. Some are machined more than others and this might be the cause of the problem. They have no idea why this is. I've had my shortblock built already and I checked my block and sure enough, some bores are chamfered more than others so I might have to go to a solid roller. Another option is having the lifter bores bushed. Hope this helps