early waterpump on 1985 318

Rapid Robert said

Go ahead & use the early cast iron pump with the nipple on the DR side same as your current DR outlet nipple rad. You have to aim the light just right to see the marks but it is easily doable. When I did mine (65 dart/83 318/dr rad lower nipple) I just used the correct length bolts to restore the same amt of thread engagement everywhere as needed & spacers/washers etc & you likely will need a different WP pulley/spacers to restore belt alignment. Best (if you play with timing alot) would be to buy one of Whitepunkkinitro's pass side bolt on timing tabs and make a new mark (exact TDC) on the dampener on the pass side. WPK I emailed you about buying one of em, did you get my email?

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That's kinda the information I was looking for. Im not to concerned with multiple timing changes, but making a timing pointer for another location shouldn't be an issue. If one of the local parts stores had BOTH water pumps I could measure them out and figure out what the difference is. And I cant seem to find ANYTHING online with a depth comparison between the early and late water pumps.

When I did the swap on my other 63 20 years ago, I had an aftermarket radiator so none of this was a concern. And after that I had electric waterpumps, aftermarket accy drives, etc. so this never came up. Just part of the learning process I guess, lol. Thanks again for all the information. Eric L