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Comp Cams Part Number 11-254-4 is an Xtreme Energy 250/256 hydraulic flat tappet camshaft designed for Chevrolet Big Block 396–454 engines (1967–1996). Tailored for Pro Street and bracket racing applications, this cam requires 10.5:1+ compression, a 3200+ stall converter, a strong intake system, headers, and appropriate rear gearing. Delivers aggressive performance with a broad 2,800–7,000 RPM operating range.
Xtreme Energy series hydraulic flat tappet camshaft
Ideal for Pro Street and bracket racing builds
Requires high compression and strong supporting modifications
Delivers aggressive top-end performance
3-bolt camshaft gear attachment
Performance-oriented idle
| Specification | Value |
|---|---|
| Camshaft Type | Hydraulic Flat Tappet |
| Series | Xtreme Energy |
| Engine Family | Chevrolet 396–454 c.i. (1967–1996) |
| RPM Range | 2,800–7,000 |
| Advertised Duration (Int/Exh) | 294 / 306 |
| Duration @ .050" (Int/Exh) | 250 / 256 |
| Valve Lift (Int/Exh) | 0.588 / 0.593 |
| Lobe Lift (Int/Exh) | 0.346 / 0.349 |
| Lobe Separation Angle | 110° |
| Intake Centerline | 106° |
| Intake Open (BTDC) | 41° |
| Intake Close (ABDC) | 73° |
| Exhaust Open (BBDC) | 87° |
| Exhaust Close (ATDC) | 39° |
| Valve Timing @ .006" | Not specified |
| Gear Attachment | 3-Bolt |
| Usage | Street/Performance |
| Lifter Type | Hydraulic Flat Tappet |
| Warranty | 12 Months |
| UPC | 036584023722 |
| Emissions Code | Not specified |
| California Proposition 65 | Cancer and Reproductive Harm (P65Warnings.ca.gov) |
Make: Chevrolet
Engine Family: 396 / 402 / 427 / 454 c.i. Big Block V8
Model Years: 1967–1996
Cam Gear Style: 3-bolt
