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A 4-2-1 exhaust system is a type of exhaust manifold for an engine with four cylinders per bank, such as an inline-four engine or a V8 engine. The layout of a 4-2-1 system is as follows: four pipes (primary) come off the cylinder head , and merge into two pipes (secondary), which in turn finally link up to form one collector pipe.
The Collector Edition had a "0" in the sixth digit of the VIN rather than the "8" found on standard Corvettes. This was the first Corvette to sell for more than $20,000, with a base price of $22,537.59. The Collector Edition had unlimited availability and 6,759 were produced out of a 1982 total production of 25,407.
In the 1980s, many U.S. production engine remanufacturers began reaming valve guides, rather than replacing them, as part of their remanufacturing process. They found that by reaming all the valve guides in a head to one standard size (typically 0.008 in. diametrically oversized), and installing remanufactured engine valves having stems that are also oversized, a typical engine head can be ...
Cylinder head porting refers to the process of modifying the intake and exhaust ports of an internal combustion engine to improve their air flow. Cylinder heads, as manufactured, are usually suboptimal for racing applications due to being designed for maximum durability.
It was fitted to a low-restriction exhaust system with a 2.5 in (64 mm) exhaust pipe, collector-type Y-junction, and exposed resonator. For 1965 (only), the muffler was of "straight through" construction. A special version, exclusive to the 1966 Dodge Dart, was available. It used a 0.5 in (12.7 mm) lift solid-lifter camshaft, fabricated-steel ...
It has a 4.125-inch (104.8 mm) bore and a 3.750-inch (95.25 mm) stroke. The 400 differed from other small-blocks in that the cylinders were siamesed and therefore required 'steam' holes in the block, head gaskets, and heads to help alleviate 'hot-spots' in the cooling system at the point above the siamesed cylinders.