The "CA" code is usually the key to a positive ID but it's not helping us in this case. As mentioned you can pull the pan and look at the crank casting number or pull the head and look at the pistons. If they're dished then it's a 250. If you pull the head then you can measure the stroke. I'm out of town and don't have my book to give you the 250's stroke. Anyone have that number handy?
