i recently bought what is supposed to be a 1975 500 c.i.
motor. the casting number is #1486200 and the intake
nuber is #1605061. i have a couple of lists showing
casting numbers but find that exact number. can anyone
help with this? any help would be appreciated.
If you look closer, I'm sure that you'll see that the block casting number actually ends with "5200". 472's and 500's from '70-'76 used the same block so that number will only tell you that it is a 70-76 472/500. To know for sure you need to check the stroke and the design of the pistons.