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Too much risk, too little reward.
Read your Q several times and I'm still a little confused
Do you want to make the actual wrist pin out of bronze, or just the bushing that goes in the connecting rod.
You are crazy. Buy them. Do you have a way to O/S the rods to make room for the bushes? How about a Sunnen hone to size them after you press them in? If you don't even know what to make then out of I don't see much chance of this venture ending having a happy ending.
Race, street or what? The application matters. An often used alloy for performance parts is aluminum silicon bronze, C642. If the engine is really serious there are step ups from there.
Hope you know how important the OD of the bushing is, faults in geometry or surface finish doom the bushing.
Use Ampco 18
Having worked in a powertrain engineering development shop for around 3 years and an engine plant for 2 years and having to maintain a machine pushing conrod pins thru rods and pistons every 4 seconds, the fit is very very close and it must be in that application. Half a thousandth or better diametral clearance is a must to prevent the rattle you will hear from the driver's seat. I would make up 30 rods and find an instrument sensitive enough to measure them all and assign them into buckets of .0002" then pick the best ones and go from there.
The cost of being "wrong" on this particular assignment is pretty high. Even if you decide to pull rods in the vehicle...you drop the pan..you remove the heads, you undress all the wiring, fueling, cooling. Huge mess. Scrape off the gaskets getting no junk in all the oily surfaces. Oil drips on you as you replace all the rods, buy a new gasket kit and start over...seems like a week in prison would be better just kidding of course but you get the idea. I build engines using RTV for the covers which requires super clean and dry surfaces, and its something I only want to do Once.
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