Update
After flip flopping on whether to do the heims, I've decided to go through with it in place of the bushings. This will be a full front end upgrade, including more teeth on rack, replacing the sheet metal tabs for the ball joints with 1/4 plate, bulking up the bulkhead, and going with 12" shocks, either from a blaster or Harley sportster. The blaster might have longer travel, but I think the sporty's shocks might ride better and support the added weights.
Concerns: clearance of the the heim to bulkhead, should I cut reliefs into the bulkhead plate, or extend the mounting locations when I beef it up? Keep in mind, I will be placing the rack on the floor of the kart for various reasons, mainly to help with bumpsteer, but also foot-to-gas-pedal clearance. I was anticipating the heims to extend the length of the arms by 3/4-1" anyway, so another 1/2" shouldn't be too much trouble, Right??
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