Hi. Im building a 69 351w from a bare block I bóught. At our local Pick and Pull wrecking yard is a 302 in a 71 Mustang. Would the crank oil slinger the fuel pump eccentric and the 3 bolt damper interchange from the 302 to the Windsor? Thanks
I think the answer is yes, but I would not recommend using a used damper, buy a Dorman or Pioneer or Performance Products or ? instead.
Yes, but if using that damper from a different motor. You will want that damper, crank, flywheel, pistons and rods balanced as an assembly.
OK thanks. Is a 351w externally balanced like a Chevy 400 and if that’s the case what will I have to get done if I were to buy a new damper I’m fairly new to Tue ways of Ford but My Cougars are way better built than my 67 Camaro.
Factory they are external balanced 28oz flywheel 157 tooth. You can take the whole rotating assembly with the new damper and have it all rebalanced externally with the 28oz flywheel. If you are going to do some high rpm’s with the motor (above 6,500 rpm’s) then you should have it changed and balanced internally which is more work to have that done and more $$$ as well. My first car was a 75 Camaro. The Cougar bug bit me a long time ago 
Yes, externally balanced.
You can generally replace the damper without worries about balance issues. These dampers do have counterweighting but the replacements duplicate this, same thing with the flywheel (28 oz. there). Brian mentions using the entire assembly and that is the ideal. Most times the reality is that doing this is not practical. As long as you use the correct application damper/flywheel, etc. it is unlikely you will have a balance problem.
Thanks for the info. This is a build of a flat top piston with a mild cam upgrade and roller tip rockers. Maybe spin it at 5000 once in awhile. Hoping to keep it just under ping issuues. I will get a new damper and my next quest is stock looking valve covers. Thanks again…
I agree. Never replaced an entire rotating assembly for a damper. Just use the right counter balance.
If you’re building it, then yes internal is better, especially for higher revs. If you just need a damper, and are sure the ra is good, then don’t waste your time and money on the entire ra.
Ford switched to 4 bolt dampers in 1970. Chuck