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GM fitted the affected vehicles with redesigned spark plug wire retainers. [6] These engines were noted for having problems with the plastic upper intake manifold cracking around the EGR passage. The engine would then hydrolock. The lower intake gaskets and upper intake manifolds were revised, correcting all these issues.
Like the GMC Syclone, the Typhoon is powered by a 4.3 L LB4 V6 engine with unique pistons, main caps, head gaskets, intake manifolds, fuel system and exhaust manifolds, producing 280 hp (209 kW) and 360 lb⋅ft (475 N⋅m) of torque.
The coil-in-cap HEI distributor was retired, and an all-new electronic distributor design was used. The intake manifold to head bolt pattern was redesigned to improve gasket integrity—four of the center intake manifold bolts were drilled at 72° instead of 90° for the cast iron cylinder heads. Changes to the valve covers were also made.
The 4.3 L (262.5 cu in) LV3 V6 is an all-new engine announced by GM at the end of 2012. GM considers this a new engine design which inherits from its predecessors its displacement, 2-valve pushrod valvetrain, 90-degree cylinder angle, and 4.4 in (111.8 mm) bore centers.
The 5.7 liter V8 (L05) engine was improved for 1990 with the addition of improved oil control rings, a redesigned rear crankshaft seal, a new camshaft sprocket design, non-asbestos intake manifold gaskets, and heavy-duty intake valves. For 1991, the 700R4 was renamed to the 4L60.
It was its own separate engine design, based on a single block casting, [19] which had four exhaust manifolds, two carburetors and intake manifolds, and two distributor caps driven by a single distributor drive, [19] plus other parts from the 351 V6. A total of 56 major parts are interchangeable between the Twin-Six and the other GMC V6 engines ...