Answer
May 26, 2025 - 07:33 AM
The ATK Performance Engine HP291PM is a Small Block Chevy 350 engine. It typically comes with a performance camshaft, but ATK uses different cam profiles based on availability or customer requirements.
From the general specs available for the HP291PM, it usually comes with a camshaft that has the following approximate specs:
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Cam Type: Hydraulic flat tappet
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Lift (intake/exhaust): .488” / .510”
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Duration @ .050” (intake/exhaust): 234° / 244°
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Lobe Separation Angle (LSA): 110°
Note: These specs are typically for a Comp Cams XE274H or similar camshaft, which is commonly paired with crate engines in this performance range (usually making around 350–385 HP).
To be 100% accurate, you'd want to check:
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The cam card provided with your engine (if available).
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Contact ATK directly with your engine's serial number for the exact camshaft specs they installed, as it may vary slightly.
Source: mytruckpoint.ca
