A new cylinder head comes with bigger valves, intake and exhaust runners with smoother sides for better airflow. It holds the valves, valve springs and the intake and exhaust runners. The cylinder head is the piece of metal that sits above the combustion chamber. A better camshaft may add up to 20 horsepower and costs under $150. Radical cams affect the engine at idle as well as the behavior of the engine in low speed situations. A cam which keeps the valves open longer means the combustion chamber can be filled and emptied better. Cams open and close the valves inside the combustion chamber. The cost is less than $200 for the manifold and under $400 for a reconditioned carburetor. Horsepower increases for carburetor and manifold are dependent on the rest of the engine however, gains from 20 to 50 horsepower and the same number in foot-pounds of torque is reasonable. After-market carburetors and manifolds offer bigger pathways for the fuel-air mixture with smoother surfaces and faster air flow. If you push more fuel/air mixture into the engine, more horsepower comes out. The new headers allow for a bigger carburetor and manifold. Headers cost under $200 and an afternoon in the garage.īuy a new carburetor and intake manifold. Headers bolt onto the block and attach to the stock exhaust pipes and catalytic converter. Chevy High Performance Magazine installed a set of Hooker headers onto a stock engine and saw an immediate increase of 16 horsepower and a more dramatic increase of 53 foot-pounds of torque. Adding headers simply brings that part of the system up to par with the rest of the parts. The performance suffers because of the small exhaust setup. The carburetor, manifold and valves are big enough to start with. The easiest performance enhancer on the Chevy 350 is a new exhaust system because it's the weak point in the stock setup. Start the engine and bring to break-in rpm.Get headers. Slow idle speeds may result in severe cam and lifter wear. Do not allow the engine to run under 2000 rpm for the first 1/2 hour.
Coat cam lobes and bottoms of each lifter with MoS2 lube (supplied) to prevent cam lobe and lifter wear from occurring during initial start-up.
Oil/additive must contain Zinc designed for use with flat tappet camshafts.
Do not use rotator type valve springs or retainers for this application. Recommended Valve Springs for OEM heads: Edelbrock part #5703 Use only stock ratio rocker arms Adjustable valvetrain required In order for this Performer RPM cam and lifter kit to be covered under ANY WARRANTY you MUST use the correct Edelbrock Sure Seat Valve Springs or equivalent.For more information, visit Installation Notes WARNING: This product can expose you to Chromium, which is known to the State of California to cause cancer or birth defects or other reproductive harm.
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