In 1958, the 35 Lark and the 35 Johnson Super Sea Horse you have became the first 35s to have a fuel pump, a thermostat and the super-quiet lower. Much different powerhead and cooling passages than the big twins, and standard Johnsons of the same and past years. Note in 1956-57, the Lark and Javelin was only a fancy outer shell, but that all changed for 1958. The 58 Lark and Super Sea Horse are similar inside but have different cowl mounts. The powerhead and lower is very similar to the 1959 35s (all OMCs) and the 1960 -61 40 HPs, but those have one-piece fiberglass covers. In 1962, the 40s got a total redesign of the crankshaft and related parts to make them more robust – you can tell these 40s by the much bigger nut on top of the flywheel.
Dave
