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Comp Cams Part Number 12-678-4 is an Xtreme Energy 244/252 solid flat tappet camshaft designed for Chevrolet Small Block 262–400 engines (1958–1998). Ideal for street/strip performance builds, this profile delivers strong mid-to-upper RPM power with a responsive and aggressive performance character. Features a 2,400–6,800 RPM operating range and a 3-bolt camshaft gear setup.
Xtreme Energy series solid flat tappet camshaft
Designed for street/strip performance applications
Strong midrange and top-end power
Works well with performance-oriented valvetrain components
3-bolt camshaft gear attachment
Suitable for 262–400 small block Chevrolet engines
| Specification | Value |
|---|---|
| Camshaft Type | Solid Flat Tappet |
| Series | Xtreme Energy |
| Engine Family | Chevrolet 262–400 c.i. (1958–1998) |
| RPM Range | 2,400–6,800 |
| Advertised Duration (Int/Exh) | 282 / 290 |
| Duration @ .050" (Int/Exh) | 244 / 252 |
| Valve Lift (Int/Exh) | 0.520 / 0.540 |
| Lobe Lift (Int/Exh) | 0.347 / 0.360 |
| Lobe Separation Angle | 110° |
| Intake Centerline | 106° |
| Intake Open (BTDC) | 35° |
| Intake Close (ABDC) | 67° |
| Exhaust Open (BBDC) | 79° |
| Exhaust Close (ATDC) | 31° |
| Valve Timing @ .015" | Not specified (value listed represents lift) |
| Gear Attachment | 3-Bolt |
| Usage | Street/Performance |
| Lifter Type | Solid Flat Tappet |
| Warranty | 12 Months |
| UPC | 036584070269 |
| Emissions Code | Not specified |
| California Proposition 65 | Cancer and Reproductive Harm (P65Warnings.ca.gov) |
Make: Chevrolet
Engine Family: 262–400 c.i. Small Block V8
Model Years: 1958–1998
Cam Gear Style: 3-bolt
