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he 422ci stroker combination in Steve Moyer's '71 Plymouth Duster is the top LA-Series small-block in our competition. With 343 wheel horsepower on tap, it is a stout street combo, based on a stock 340 block and a 4.00-inch stroke crank. The modest compression ratio of 9.5:1 generated by Diamond dished pistons ensures easy pump gas performance, the gasoline being fed via a Quick Fuel 750 carb perched upon an Edelbrock AirGap intake manifold. The cylinder heads are Indy T/A's, a variation of the Edelbrock casting with offset intake rocker arms for a larger port cross-section. Mopar Performance supplied the cam, featuring 272 degrees duration at .050-inch and .533-inch lift.
RPM: HP:
4,200 222
4,300 253
4,400 275
4,500 292
4,600 308
4,700 321
4,800 331
4,900 337
5,000 343
Max Power 343


Is it just me or would that engine not make peak power higher than 5000rpm?Maybe the cam spec of 272* @ .050 should have been gross duration.

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