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THESE ENGINE FEATURES HAVE BEEN RETAINED FOR 1968:
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Lightweight Timing Belt Covers -
All OHC 6 Engines. This cover, constructed of durable, lightweight plastic, is a contributing factor in reducing engine weight.
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Wide Accessory Belt Grooves in Harmonic Balancer -
All OHC 6 Engines. These wider grooves improve belt retention and prolong belt live.
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Specific Camshaft -
All 2-BBL V-8 Engines. Designed to provide more low-speed torque with improved idle qualities. Excellent low-speed performance with no sacrifice in fuel economy results when his camshaft is combined with the 400-cubic-inch engines.
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Threaded Rocker Arm Studs -
Firebird, GTO, Grand Prix and 428-Cu.-In. Engines. To assure proper stud retention in these high-performance engines, studs are threaded into the cylinder head rather than pressed.
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Special Intake Manifold -
4-BBL Quadra-jet Carburetor. This manifold features an efficient streamlined "runner" design for improved engine breathing and added performance.
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2.29:1 Axle Ratio -
Catalina 2- and 4-Door Sedans with Turbo Hydra-Matic. When combined with premium-fuel engines, this special axle ratio assures owners the ultimate in smooth performance and economical operations.
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Lightweight, All-aluminum Pistons -
All 1968 Engines. By reducing inertia forces, these lightweight pistons contribute to the engine's smooth performance under all driving conditions.
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Aluminized Water Pump Internal Housing -
All 1968 Engines. Constructed of aluminized stamped steel for greater durability, the housing features a ceramic seal seat to improve sealing and mating of parts.
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"Reverse Twist" Top Piston Rings -
All 1968 Engines. Specially designed to provide outstanding oil economy under all normal driving conditions.
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Calibrated Circulation Thermostat -
All 1968 Engines. Features 190° F. Control to provide increased engine operating efficiency plus more positive car heating and de-icing performance.
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Oversize Intake and Exhaust Valves -
All 1968 Engines. Specially designed to minimize restriction of air flow and promote maximum engine breathing.
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Full-pressure Lubrication System -
All 1968 Engines. Features full-flow oil filter as standard equipment. Positive ventilation system directs crankcase fumes to intake manifold for more complete elimination of engine fumes.
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Low Silhouette Air Cleaner -
All 1968 Engines. Equipped with silencing air tube, this compact air cleaner permits a lower, cleaner hood design.
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High Output Starter -
All 1968 Engines. Specially designed for extra-quick starts, this high output unit features a dirt-free, sealed clutch and a special lightweight base mount.
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Aluminized Exhaust System -
All 1968 Engines. This system, with large muffler and tailpipe, protects parts against rust and assures longer exhaust system life.
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Dual Exhaust System -
Standard on Firebird H.O., Firebird 400, GTO, Grand Prix and on All Models Equipped with the 350 H.O., 400 H.O. and 428 H.O. Engines. Specially designed for the high-performance engines, this low-restriction system enhances engine operation at all speeds.
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Special Cooling System -
All 1968 Engines. This cooling system features full-length water jacket chamber to insure proper engine temperatures and equal temperature control for all cylinders under all operation conditions.
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