Chevrolet CMP Engine variants

[Bob Carriere]

Has no modification and he made it fit ...... not sure how????

[Bob Carriere]

Too many pictures gets confusing......

I think we better wait for Phil's pictures which will be far more accurate.

sorry!!!

[Jordan Baker]

My understanding is that Grant used a 261 and a home made adaptor plate to fit an early one hole 216 water pump. Using the one hole pump there if enough room to fit the throttle rod unmodified.

My engine is a late 216 that used s two hole water pump, this means I have to either modify the throttle linkage to fit or find a way to fit the early one hole pump to a two hole pump engine. I'm not sure this is possible.

[Bob Carriere]

Would it not be easier to find a rebuilt 2 hole pump????


I think I am going to bed to think about it....

Ps one holer are $200 on ebay but a rebuilt two hole is $90


Water-Pump-CHEVROLET-1942-1946-1947-1948-1949-1950-1951-1952-CORVETTE-1953-1954.............. search for this item.

[Jordan Baker]

Ive got a good two hole pump that came with my orange engine. I'll try it with its original pulley back on. I thought I had to remove the pulley flange from the one hole pump and install it on the two hole one. However doing this seems to have taken up all the room for the throttle linkage.

[Grant Bowker]

Originally Posted by Bob Carriere

Has no modification and he made it fit ...... not sure how????

At this point I don't recall if it was careful parts selection or pure dumb luck but I think it was a close fit although I do remember it not having a lot of spare space. There are a variety of thermostat housing castings, each a bit different from the others WRT wall thickness, clearance angle at lower front and overall bulk. There are also slight manufacturing differences in the throttle linkage across the front of the engine that can help/hurt. And... there are several different casting numbers of each of the 1 and 2 hole pumps that vary slightly in shape (plus aftermarket pumps) to add or reduce clearance. I remain very nervous about the idea of modifying the 2 hole 216 block to accept a 1 hole pump. it just looks like more holes, closer together than I am comfortable with - but it might be alright in spite of my nervousness.