The timing cover, crankshaft, and accessory drive were all modified to fit in a FWD engine bay.The starter was mounted on the transmission-not the engine block.The engine shaved about 3mm off the flexplate side and 10mm off the crank snout, and featured a unique timing cover. The engine used a metric, 60-degree, Chevrolet V6 bellhousing.It also had a unique (small) 4-bolt throttle body pattern. The intake manifold was smaller than other LS manifolds and reversed, placing the throttle body over the flexplate.The engine was mounted in a transverse position, using unique motor mounts. ![]() To make this engine work for those FWD cars, GM made several major modifications to the engine: ![]() While the LS4 is likely a poor choice for an engine-swap project, it’s not out of the question that you own one of these likable V8-powered vehicles, and want to add a little giddy-up to that sideways 5.3-liter. The LS4 is unique in the LS engine family because it was a transverse-mounted engine used only in front-wheel drive (FWD) cars from 2005-09, namely the Pontiac Grand Prix GXP, the Chevy Monte Carlo SS and Impala SS, and the Buick LaCrosse Super.
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