Quote:
Yes, the grease markings on the sides of each cylinder is to match the piston to the actual bore size.
The way it worked was that the block machining line would hone and measure the bores, then write the letter code on the side of the block.
The block would then go to the engine assembly line where the pistons would be pulled from corresponding "lettered" bins. (the pistons were measured and sorted into the bins by size)
This process allowed for a wider tolerance range on the parts with-out the risk of getting a too loose or too tight combo installed, due to tolerance "stack-up".
DD
Nice! The way it worked was that the block machining line would hone and measure the bores, then write the letter code on the side of the block.
The block would then go to the engine assembly line where the pistons would be pulled from corresponding "lettered" bins. (the pistons were measured and sorted into the bins by size)
This process allowed for a wider tolerance range on the parts with-out the risk of getting a too loose or too tight combo installed, due to tolerance "stack-up".
DD
Ive got a Yale forklift at work with an IND-30 flathead six that has these letters stamped on a boss at the front left side of the block, I was wondering what they meant. Right on!