The Stovebolt Site Forums The Shop Area Engine Shop 235 in a '40 KC 1/2 Ton Pickup

When I purchased this truck project, a previous owner had put a 1954 model 235 engine into it. It has never been run with this engine.

I have read Barry Weeks' Tech Tip about swapping a 235 into a 1940 pickup and I have also read a number of posts here about long/short water pumps.
My issue at the moment, is that I don't know what water pump is on the engine.

Could someone familiar with the different water pumps tell me if the one I have currently on the engine is the short shaft model?

(Barry Weeks' Tech Tip concerning the 216 to 235 swap points out that some of the later 235s had side mounts, but this one is mounted to the frame in the front.)

Thanks,
Nick

Nick, Looks very much like the short pump that you need. The whole point was to ensure fan clearance with the radiator, which you have according to your picture. A long shaft pump would have the fan contacting the radiator face. Just out of curiosity, what is the Serial# stamped into the machined pad directly behind the distributor on the block???

Dan,

The serial number on the block is 0022139 F54Y
I was asking about the serial number in a different thread a couple of weeks ago and you let me know then that it indicates that it was manufactured for a passenger car with a Powerglide transmission.

I am having an issue now as I try to get things on the truck to fit together properly. I have posted on the VCCA site asking if anyone knows the measurement between the firewall and the radiator support brace rod mounting holes in the top of the "doghouse" radiator support shell. (I received the truck with literally one bolt and some wire holding each of the front fenders on. The radiator support brace rod was not connected to anything but the firewall. The upper radiator hose was doing a significant part of holding things together!)

Thanks!
Nick

Nick, I would suggest posting your question about the measurements of the "firewall and the radiator support brace rod mounting holes in the top of the "doghouse" radiator support shell" in the General Truck Talk forum. There are a number of 1940 Chevy 1/2 ton truck 'Bolters that could measure their trucks and provide you that info and maybe some detailed pics of the engine compartment and front sheet metal to help you figure your stuff out! Doesn't hurt to ask anyhow.

Thanks for the suggestion, Dan. I will do that!

The quick way to identify the "high pump" engine (which yours appears to be) is to look at the pulley. The 216 and early 235 water pump has a cast iron pulley which is pressed onto the shaft, and it's very close to the thermostat housing. For fan clearance to the hood on midyear 55 trucks and later, the pump was moved down on the block almost 3 inches, and the pump impeller protruded into a large hole in the front of the block. It also has a round flange on the shaft, and a sheet metal pulley is bolted onto the flange. That's the one that creates radiator clearance problems with 1954 and earlier vehicles.
Jerry

Thanks Jerry.

I have another water pump that came to me in a box of misc parts from an auction. I have attached a photo of that pump. Would it be the long shaft model? I couldn't find any casting marks on it and was wondering if there was a way to identify it so perhaps I could find someone who needed it.

Yes, that's the late model pump with the bolt-on pulley. The impeller also protrudes back into the front of the block instead of being contained inside the pump housing, with a rear cover plate. Early blocks have either one or two small holes in the front, depending on the year of manufacture, and the pump casting aligns with the hole(s).
Jerry

Thanks Jerry!
I appreciate the information and being able to identify one more item on my miscellaneous parts shelf!