What modifications are required to use this camshaft?

This camshaft requires supporting modifications for optimal performance. You'll need a modified TPI system with upgraded injectors, plenum, and runners, along with a free-flowing exhaust system and a torque converter with a 2000+ RPM stall speed. Custom computer tuning is also essential.

Does this camshaft fit LT-1 or LS1 engines?

No, this camshaft is specifically designed for OE roller Small Block Chevy engines from 1987 and newer. It is not compatible with LT-1 or LS1 engine families.

Is this camshaft street legal in California?

No, this camshaft is not CARB approved and cannot be shipped to California due to emissions regulations.

COMP Cams Hydraulic Roller Camshaft CS XR276HR-12

Name: COMP Cams Camshaft CS XR276HR-12
Brand: COMP Cams
Price: 610.12 USD
Availability: InStock

COMP Cams Camshaft CS XR276HR-12

$610.12

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

COMP Cams Xtreme Energy hydraulic roller camshaft for OE Roller SBC engines. Improves performance for computer-controlled TPI systems.

Key Features

Fits '87+ GEN 1 Chevrolet 305-350 Small Blocks with factory roller camshafts.
Xtreme Energy hydraulic roller camshaft profile.
Intake duration at .050 inch lift is 224 degrees.
Exhaust duration at .050 inch lift is 230 degrees.
Intake lift is .495 inches.
Exhaust lift is .502 inches.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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Will this fit your vehicle?

Product Details

This is the COMP Cams Xtreme Energy XR276HR-12 hydraulic roller camshaft. It's designed for Small Block Chevy engines from 1987 and newer that came with factory roller camshafts, specifically excluding LT-1 and LS1 variants. This camshaft is a significant upgrade for those looking to enhance the performance of their computer-controlled Tuned Port Injection (TPI) systems.

The XR276HR-12 features a 224-degree intake and 230-degree exhaust duration at .050 inch lift, with .495 inch intake and .502 inch exhaust lift. This profile is optimized for computer-controlled TPI setups, but it requires supporting modifications to work correctly. You'll need an upgraded torque converter with at least a 2000 RPM stall speed, a free-flowing exhaust system, and modified TPI components including injectors, plenum, and runners. Because this camshaft changes the engine's breathing characteristics, custom tuning of your vehicle's computer is essential to get the most out of it and ensure proper operation.

This camshaft fits a wide range of vehicles, including many Chevrolet and Buick models from the late 80s through the mid-90s. It's a popular choice for enthusiasts looking to wake up their older computer-controlled V8s. Keep in mind that this part is not CARB approved and cannot be shipped to California. Proper installation and tuning are key to realizing the performance benefits this camshaft offers.