some 430's (older?) have the extra riser on the exhaust manifold some do not. can anyone shed some light on this??? otherwise... these are great engines btw.
Riser Hight The riser is to keep water out of the engine. when the designer caculated the water line and where the engine sat the hieght required to keep water out is in the hieght of the riser.
430 differences yes... thanks for the info. wasnt sure if the riser had any other functions other than to raise the water level height into the manifold. So as far as I can tell all 430 blocks, heads, etc are the same ? \alex
That should be true for the marine engines. The MEL didn't change much over its lifetime, except for some displacement increases. The roadgoing engines had manifold changes and piston changes which should not have been reflected in the marinized variants.
There are substantial differences in the years that the MEL 430 engine was produced. The heads, intake manifolds, compression ratios, carburetion, and cooling systems all changed within the 1958-1965 life of the 430. The 430HR Chris Craft was the earlier model by CC, the 431 reflected the cooling systems changes that CC did to keep the engine cooler when used in the bigger boats. In particular, the intake manifolds and heads do not interchange between years, since the port sizes are different.