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HEI distributors are a popular swap on older GM cars originally equipped with points and condenser type ignition systems. [citation needed] The HEI system produces a more powerful spark, which allows for a wider spark plug gap for surer ignition of a fuel/air mix that may not be optimal. The HEI setup has also become a popular swap into non-GM ...
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 1975 high energy ignition (HEI) provided spark to the spark plugs with minimal maintenance and increased power. The larger distributor cap also provided better high-RPM performance by decreasing the likelihood of the spark conducting to the wrong terminal. The 250-cubic-inch in-line six of 105 hp (78 kW) was offered as the base engine.
A distributor consists of a rotating arm ('rotor') that is attached to the top of a rotating 'distributor shaft'. The rotor constantly receives high-voltage electricity from an ignition coil via brushes at the centre of the rotor. As the rotor spins, its tip passes close to (but does not touch) the output contacts for each cylinder.
As batteries became more common in cars (due to the increased usage of electric starter motors), magneto systems were replaced by systems using an induction coil.The 1886 Benz Patent-Motorwagen and the 1908 Ford Model T used a trembler coil ignition system, whereby the trembler interrupted the current through the coil and caused a rapid series of sparks during each firing.
Within 18 months, the design of the Chevy II was completed, including new 153 cu in (2,512 cc) four-cylinder and 194 cu in (3,185 cc) six-cylinder engines to power it. The 153 cu in engine had a 3 + 7 ⁄ 8-inch (98 mm) bore and 3 + 1 ⁄ 4-inch (82.6 mm) stroke, with two overhead valves per cylinder actuated by pushrods and a 1-3-4-2 firing order.