Thanks for the replys. This means that I will have no choice but to repair the A201G gas engine that I currently have in my 450.
I looked closely at all 4 sleeves and can not see any evidence of a crack. The #1 sleeve does look rough compared to the other 3, but no signs of a crack. I left the coolant level in the block flush with the top of the block with the thought that if a crack was present, the coolant would flood the cylinder if I let it sit long enough. None of the 4 cylinders flooded. I'm still not convinced a sleeve is cracked. I am leaning more towards the idea that the head gasket face is warped. What do you guys think?
As for the undercarriage, ya it's pretty done. I bought the crawler with the thought that I would have to put money on that and not the engine.