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COMP Cams CL08-503-8 COMP Cams Xtreme Energy Cam and Lifter Kits

COMP Cams CL08-503-8 COMP Cams Xtreme Energy Cam and Lifter Kits

$708.65
$708.65
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The COMP Cams CL08-503-8 COMP Cams Xtreme Energy Cam and Lifter Kits is a matched camshaft and lifter kit engineered for drop-in performance. Factory-matched cam and lifter sets eliminate compatibility concerns and ensure proper break-in and valvetrain geometry. These kits are the go-to choice for enthusiasts building high-performance street, strip, and marine engines.

The camshaft is precision-ground with the specified lobe profile for your application, using COMP Cams proprietary lobe master patterns. The lifters are specifically matched to the cam profile and heat-treated for long service life. Proper break-in procedure is critical for flat tappet cam and lifter combinations -- use the recommended break-in oil additive and follow the RPM and time guidelines provided with the kit. Failure to follow proper break-in procedure is the most common cause of camshaft and lifter failure in newly built engines.

Using a matched cam and lifter kit eliminates the risk of mismatched components that can cause premature wear or failure. COMP Cams grinds each cam to exact specifications and selects the appropriate lifters for the lobe design. The result is a valvetrain combination that performs exactly as intended, with the power curve, idle quality, and RPM range you expect from the cam specifications. The kit includes all components needed for a complete installation.

Order your COMP Cams CL08-503-8 COMP Cams Xtreme Energy Cam and Lifter Kits for a complete cam swap solution.
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Frequently Asked Questions

What duration and lift ranges does this COMP Cams Xtreme Energy provide for my engine build?

The COMP Cams CL08-503-8 COMP Cams Xtreme Energy Cam and Lifter Kits provides duration figures typically ranging from 262 to 290 degrees advertised and 218 to 242 degrees at 0.050 inch tappet lift. Valve lift measures 0.480 to 0.580 inches depending on the specific grind, with lobe separation angles from 108 to 114 degrees. This camshaft is designed for power bands from 2,000 to 6,500 RPM and peak torque around 4,200 to 4,800 RPM. Always check your piston-to-valve clearance with a clay test when using lift above 0.540 inches on small block cylinder heads.

How does this COMP Cams Xtreme Energy perform with a 383 stroker or 408 stroker engine build?

On a 383 or 408 stroker platform, this camshaft delivers exceptional mid-range torque from 3,000 to 5,500 RPM thanks to increased cubic inch displacement. The longer stroke of 3.75 to 4.00 inches benefits from the camshaft's lobe separation of 110 to 112 degrees, producing 425 to 475 horsepower with proper cylinder head flow. Expect manifold vacuum to measure 10 to 14 inches at idle, adequate for power brakes in most applications. Pair with a single-plane intake manifold if your operating range exceeds 3,500 RPM for best results.

Does this COMP Cams Xtreme Energy need a tune for a modern LS or LT engine?

A professional computer tune is required when installing this camshaft in any LS or LT engine to recalibrate fuel and spark tables for the new cam timing events. The increased overlap of 55 to 75 degrees will cause lean misfire codes and torque converter lockup issues without revised VE tables. This camshaft may require injector flow rates of 32 to 42 pounds per hour at 58 PSI for LS engines exceeding 450 crank horsepower. Use HP Tuners or EFI Live software to adjust idle airflow target to 28 to 32 grams per second and lower MAP spark advance.

What valvetrain components should I upgrade when installing this COMP Cams Xtreme Energy?

When installing this camshaft, upgrade to double valve springs with 130 to 160 pounds of seat pressure and 350 to 400 pounds open pressure to control the valvetrain above 5,500 RPM. 5/16-inch or 3/8-inch chromoly pushrods with 0.080-inch wall thickness prevent flex and maintain accurate rocker arm geometry. This camshaft benefits from hardened 7/16-inch rocker studs and guide plates to handle increased side loading on the valve stems. Install a new timing set with a true roller chain rated for 8,000 RPM to ensure accurate cam timing.

Can this COMP Cams Xtreme Energy run on pump gas with a 10.5 to 1 compression ratio engine?

Yes, this camshaft can safely run on 91 to 93 octane pump gas with a static compression ratio of 10.5 to 1 due to its intake valve closing point that bleeds off dynamic compression. The later intake closing at 68 to 72 degrees after bottom dead center reduces effective cylinder pressure to 8.0 to 8.5 to 1 dynamic compression. This camshaft works well with aluminum cylinder heads that dissipate heat 30 to 40 percent faster than cast iron. Monitor for spark knock on hot days above 90 degrees Fahrenheit and consider retarding timing 2 degrees if pinging occurs.

What is the recommended RPM range for maximum power with this COMP Cams Xtreme Energy?

This camshaft delivers peak horsepower typically between 5,500 and 6,200 RPM with peak torque occurring at 4,000 to 4,800 RPM depending on intake manifold selection. The recommended operating range spans from 2,500 to 6,500 RPM, with power falling off above 6,500 as the cylinder heads reach flow capacity limits. This camshaft supports shift points at 6,200 to 6,500 RPM for automatic transmissions and 6,500 to 6,800 for manuals in a 350 to 427 cubic inch small block. Match with a 650 to 750 CFM carburetor or 36 to 42 pound injectors for EFI at this power level.