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Cloyes Gear 9-3147 Cloyes Original Race True Roller Timing Sets

Cloyes Gear 9-3147 Cloyes Original Race True Roller Timing Sets

$131.50
$131.50
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The Cloyes Gear 9-3147 Cloyes Original Race True Roller Timing Sets is a premium timing chain and sprocket set engineered for precise camshaft timing in high-performance engines. The timing set maintains the critical relationship between crankshaft and camshaft rotation -- any variation here costs power and risks valve-to-piston interference.

Featuring a true roller chain design with matched sprocket sets, this timing set eliminates the slack and timing variation common with stock-style silent chains. The steel sprockets are precision-machined for concentricity and feature multiple keyway positions for degreeing the camshaft without offset bushings. Multiple keyway positions allow 2, 4, 6, and 8 degrees of advance or retard adjustment at the crankshaft, giving you fine control over cam timing to dial in your power curve. The roller chain reduces friction and improves timing accuracy at all RPM levels, especially under load where chain whip can introduce timing errors.

The chain tensioner is spring-loaded and self-adjusting where applicable, maintaining proper chain tension throughout the engine life. This eliminates timing chain slap that causes inaccurate cam timing and eventual chain failure in high-mileage or high-RPM engines. The sprocket teeth are heat-treated for wear resistance, and the chain is pre-stretched during manufacturing to minimize initial timing changes during break-in. Designed as a direct replacement for factory timing sets on compatible applications, installation is straightforward with standard tools.

At elevated RPM, timing chain stretch becomes a real concern that affects valve timing and power output. This timing set's true roller design reduces stretch significantly compared to stock chains while maintaining timing accuracy within tight tolerances at the camshaft. The difference in throttle response and top-end power between a stretched stock chain and a fresh true roller set is immediately noticeable on the first test drive. Order your Cloyes Gear 9-3147 Cloyes Original Race True Roller Timing Sets and time your build right from the start.
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Frequently Asked Questions

What type of timing chain does this Cloyes Gear 9-3147 Cloyes use for strength and durability?

This timing chain and gear sets uses a true roller timing chain with heat-treated steel pins and sintered iron rollers for maximum strength and reduced stretch under load. The chain features a pitch of 0.250 inch with 38 to 50 links depending on the specific engine application and block deck height. This timing set provides camshaft position accuracy within plus or minus 0.5 degrees at 6,500 RPM with only 0.005 inch of chain stretch over 50,000 miles of street use. The dual-roller design handles spring pressures up to 400 pounds open and supports RPM ranges from idle.

Does this Cloyes Gear 9-3147 Cloyes come with multiple keyway positions for cam timing adjustment?

Yes, this timing chain and gear sets includes camshaft sprockets with multiple keyway positions offering 2, 4, 6, and 8 degrees of advance or retard for tuning cam timing to your specific combination. Each keyway position changes the lobe centerline relationship by 2 degrees at the camshaft or 4 degrees at the crankshaft for precise power band adjustment. This timing set features laser-etched degree markings on both sprockets for visual verification of the installed position at top dead center. Advancing the timing 4 degrees shifts the power band approximately 300 RPM lower for improved low-end torque in heavy vehicles.

Can this Cloyes Gear 9-3147 Cloyes be installed without removing the engine from the vehicle?

Yes, this timing chain and gear sets can be installed in the vehicle by removing the radiator, cooling fan, harmonic balancer, and timing cover for access. You will need a harmonic balancer puller and installer kit plus a 200 foot-pound rated breaker bar for the crankshaft bolt. This timing set installs similarly to factory equipment requiring alignment of timing marks on the camshaft and crankshaft sprockets at top dead center number one cylinder. Budget 3 to 4 hours for the swap including cleaning timing cover sealing surfaces and installing a new timing cover gasket and front seal.

How often should this Cloyes Gear 9-3147 Cloyes be replaced in a performance engine application?

In street performance engines, this timing chain and gear sets should be inspected every 30,000 miles and replaced at 60,000 miles or whenever the timing cover is removed for other service. The true roller chain in this timing set stretches approximately 0.002 to 0.005 inch per 10,000 miles depending on valve spring pressure and RPM usage. For racing engines with spring pressures exceeding 350 pounds open and sustained RPM above 7,000, replace this timing set every 50 to 100 passes or 5,000 miles. A timing set with 3 degrees of chain slop at the camshaft indicates replacement.

Does this Cloyes Gear 9-3147 Cloyes work with hydraulic roller and solid roller camshafts?

This timing chain and gear sets works with hydraulic roller, solid roller, flat tappet hydraulic, and flat tappet solid camshafts as long as the camshaft nose accepts a standard 3-bolt or 4-bolt timing sprocket pattern. The steel camshaft sprocket features hardened teeth for durability with aggressive roller cam profiles that create higher valvetrain impact loads. For camshafts requiring a cam button for thrust control, this timing set provides 0.005 to 0.010 inch end play clearance machined into the cam sprocket hub. Verify that your camshaft's dowel pin diameter matches the timing sprocket at 1/8 inch or 5/32 inch.

Will this Cloyes Gear 9-3147 Cloyes clear a double roller timing cover without modification?

Most aftermarket double roller timing covers provide clearance for this timing chain and gear sets when using standard thickness cover gaskets and a 0.030 to 0.060 inch spacer behind the crankshaft timing sprocket. Some factory timing covers may require grinding 0.100 to 0.200 inch of material from the inside of the cover for chain clearance. This timing set requires a minimum depth of 0.250 inch from the front of the block to the timing sprocket face for proper chain alignment. For engines originally equipped with nylon tooth timing sprockets, replacement of the cover with a performance unit.