The Tri-Power carburetion system was replaced with a single 4-barrel Rochester Quadrajet carburetor. The standard engine was a Firepower V8, with single 4-barrel carburetion. Two-barrel carburetion was standard; all high performance 324s came with four-barrel carburetors. Standard equipment included a 305-horsepower 361 cubic inch V8 with four-barrel carburetion and dual exhaust. The Terraplane Eight engines featured more efficient downdraft carburetion. By trial-and-error, Frank worked out problems of ignition, carburetion, and transmission. The basic four developed 70 horsepower, but two-barrel carburetion increased the rating to 84. Two new upmarket engine choices were available, the 351 Windsor with two- and four-barrel carburetion. It had a five main bearing crankshaft, and down draft carburetion. Indirectly involved with carburetion is the unique "port valve". This prompted most buyers to opt for conventional carburetion. After 1980, electronic feedback carburetion was used on the 267. This system is referred to as "ERIC", which stands for "Electronically Regulated Ignition and Carburetion". Carburetion or fuel injection could be specified for the Corvette or Pontiac engines. Compound Carburetion was eliminated and the compression ratio was reduced to 6.60&colon;1.