Inliners International Forums General Discussion Engines Will a 250 cam work in a 292?

IIRC?
Unlike the Gen-2 216, 235, 261 (which have the cam directly below the rocker arms and vertical pushrods), the Gen-3 194, 230, 250 have the cam placed outboard of the rockers which allows more clearance between the cam and the swing path of the connecting rods. In cross-section, the pushrods are not vertical, but tilt inward from the tappets to toward the rockers.
This was enough in the short stroke engines, but the 292 with it's much longer stroke doesn't have enough room for rod travel, so material is removed from the blanks to prevent contact.