I love my Z409 6.0L PCM! Main reason I got it was because of the engine design. The 409 is based on GM's Gen 3 engines (LS Family) while the 343 uses the older GM Gen 2,(vortec)engine design.
Main differences that influenced my decision were:
-The 409 uses individual coil packs instead of a distributor.
(no moving parts and no chance for water condensation)
-The 409 does not have water crossover ports in the heads.
(reduces the chance of water getting in the engine)
I'm sure there are many other valuable design improvements but those two were enough to make the decision for me quite easy.
My fuel usage is great, power comes on smooth, and is very quiet!
Good luck, and I hope this info helps you to make an informed decision and feel confident in your engine choice
Main differences that influenced my decision were:
-The 409 uses individual coil packs instead of a distributor.
(no moving parts and no chance for water condensation)
-The 409 does not have water crossover ports in the heads.
(reduces the chance of water getting in the engine)
I'm sure there are many other valuable design improvements but those two were enough to make the decision for me quite easy.
My fuel usage is great, power comes on smooth, and is very quiet!
Good luck, and I hope this info helps you to make an informed decision and feel confident in your engine choice
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