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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.
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.
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 ...
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.
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