Changes and advancements on Ameri-Barra Vortec 4200 DOHC VVT Inline 6 Trailblazer engines over the years and recommendations on which parts to use. We look at the connecting rod designs, crankshaft designs, cylinder head designs, exhaust manifold designs, the different PCM ECU revisions and which one is best for your goals. These engines have so much capability, for the junkyard stock bottom end guys.
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