Car Craft<\/p>\n\n\n\n
GMC Turbocharged\/Intercooled 4.3-Liter V6<\/p>\n\n\n\n
As the unofficial maximum-performance version of the Vortec V6, GMC’s turbocharged and intercooled Syclone engine is it small-displacement tactical nuke. In this high-output application, the 4.3’s gray cast-iron block is fitted with upgraded nodular iron main caps. specific intake and exhaust manifolding, a new EFI system, and cast hypereutectic heat-treated aluminum alloy pistons from the L98 Corvette. Attesting to the base 4.3 engine’s nearly bulletproof construction, the Vortec’s standard cast-nodular-iron crank, low-tension piston rings, wrist pins, roller lifters, hydraulic cam, and forged connecting rods are retained. The castiron cylinder heads also carry over from the base V6 but a special graphite composite head gasket with stainless flanges and annealed steel lire rings was specially developed by Victor Products to deal with its elevated cylinder pressures.<\/p>\n\n\n\n
The same Bosch throttle body and top-feed pintle-type fuel injectors used on the L98 Corvette’s 350 V8 meter fuel to the Syclone V6 through a two-piece aluminum intake manifold. Engine management is via a speed density EFI system using a closed-loop engine module engineered by GM’s AC\/Delco division. Electronically regulated by an integral wastegate to develop a maximum of 14 pounds of boost, the turbocharger itself is a Mitsubishi TD06 unit with it watercooled center bearing. In this limited-production setup, pressurized air from the turbo outlet is plumbed through a liquid-to-air intercooler before it’s fed to the throttle body and intake manifold.<\/p>\n\n\n\n