For the last two years of its production life, the Street Hemi had hydraulic lifters, but the cam retained approximately the same valve events as before. Street Hemis ran best with their valve lash adjusted just right, and hydraulics were the factory’s way of making sure it stayed that way regardless of the owner’s maintenance habits.
Hemis were easy to drive in commuter traffic but hard to race from a standing start because of the way the carburetors worked. At light throttle, the engine ran on the front half of the rear four-barrel. As the pedal went down, the primaries of the front four-barrel opened, followed after a bit by both secondaries at once. A good launch required enough wheelspin to get the revs up into the torque range, but it was easy to open too many throttles too soon and burn the tires. The necessary technique was quite challenging with a four-speed. If you were Hemi hunting in a lesser car, you wanted to catch him at a stop. If he fumbled and you were lucky enough to pull out a fender-length on him, you claimed victory early by backing off the power, thereby ending the run. If you were crazy enough to stay on it, the Hemi would take over in short order.
The introduction of – and improvements in – the bias-belted tire in this period greatly increased traction. ET’s were maybe a 0.1 second or so quicker than earlier Hemis, while trap speed remained the same.
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