I'm confused! The ID# on my bb are port side
OL414804 and starboard OL414792. I'm finding both number
sequences in two different motor listings. They are either
502/500 generation+ or 540/500 Bulldogs. They have B&M huffers and twin 650 double pumpers topside. Is there anyway to tell the difference just by looking at them. Your input is greatly appreciated.
Happy holiday ya'll.

are the huffers black? could be sc engines... post pics

The 540 is a tall deck with a block mounted fuel pump, the 502 has the water pump mounted one with no block boss for a pump.

There Aluminum. I'll get a pic and post it in the AM. Thanks.

You can use regular blocks to make 540's. I think you need to at least pull the pan and take some measurements.

Are they Hawks? They made 550, and 600 Hawks out of Merc 454's and 502's using B&M 250's.