The 3100 and 3400 engines are called Gen 3, because they are the third generation pushrod 60V6 engines. The reason for the swap is simple. Flow and design, both of which the gen 3 triumphs all previous gens. The iron heads don't have splayed valves, D shaped exhaust ports, or in some cases even the larger valves (1.42/1.72). The Gen 2 Aluminum head engines are the most popular to do this swap, but no matter what you start with, the same steps apply.

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Easy way...use a 3.4 DOHC windage tray, otherwise have fun doing it this way.

Parts you need:

7 - 3X00 Main cap bolts,
7 - 3X00 Windage tray nuts
1 - 3X00 Windage tray. (GM calls it a Crankshaft Oil Deflector)

Its a fairly simple mod, Easiest if the engine is Out of the car so you can have it on the stand and upside down to work on the bottom end.

Obviously, Remove the Oil Pan.

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