The Stovebolt Site Forums The Shop Area Engine Shop short water pump

I reread your post and am afraid we've gotten confused.

If you are putting a post 54 235 in a post 54 truck you don't need an adapter or shortened pump, all you need is the stock pump.

If you put a later 235 in an earlier truck you need a shorter pump because the later engine is longer than the original.

The later engine also mounts the pump lower so some people use adapters to raise the pump higher inorder to get it centered infront of the radiator. Other people lower the radiator.

You don't have to move your pump up or down or in or out if it is the right engine in the right truck. You said you were putting a post 54 235 in a 55 first series, so unless I'm confused, I think what you need is a stock pump.