ProBoost Street – Stage 1 Small Block Chevy Hydraulic Flat Tappet BOOST Camshaft
Looking for more power from your turbocharged or supercharged Small Block Chevy without losing street manners?
The ProBoost Street Camshaft is our Stage 1 Hydraulic Flat Tappet Boost grind, an excellent choice for builds running up to about 8 psi of boost. It delivers a broad torque curve, crisp throttle response, and strong mid-range pull — all while keeping idle quality smooth and drivability intact.
Perfect for street rods, muscle cars, and entry-level boosted builds with a 116 Degree Lobe Separation for less boost bleed off, keeping as much boost you work so hard to build in the cylinder!
📊 Camshaft Specs:
Intake Duration @ .050": 214°
Exhaust Duration @ .050": 206°
Advertised Duration: 261° / 253°
Valve Lift: .440" intake / .420" exhaust
Lobe Separation Angle (LSA): 116°
RPM Range: 1,800 – 6,000
⚡ Performance Notes:
Part of the ProBoost Camshaft Series
Ideal camshaft option for turbo or supercharged SBC engines running up to ~8 psi of boost
Broad torque curve for street and strip use
Optimized for small to mid-size turbochargers and entry-level boost builds
Works with stock or mildly upgraded cylinder heads
Great balance of drivability and boost-friendly valve timing
🔧 Recommended Upgrades:
High-quality valve springs matched to cam specs (.440"/.420" lift)
Hardened pushrods for durability under boost
Performance lifters (hydraulic flat tappet)
Upgraded timing set (double roller preferred)
High-flow fuel system (injectors/pump to match boost level)
Proper ECU tuning or carb jetting for boost applications
🛠️ Installation Notes:
Always use new lifters when installing a flat tappet camshaft.
Apply a premium moly camshaft break-in lube and run high-zinc break-in oil for the first 30 minutes at 2,000–2,500 RPM.
Check piston-to-valve clearance if using aftermarket pistons or milled heads.
Verify valve spring pressures match recommended specs to avoid premature wear.
A professional tune is highly recommended to maximize performance and reliability.
⚙️ The ProBoost Street Camshaft (Stage 1) is the ultimate street-friendly cam for boosted small block builds — giving you dependable performance, drivability, and the extra punch you need under turbo or supercharged setups up to ~8 psi.
ProBoost Street 261/253 Small Block Chevy 262-400 Hydraulic Flat Tappet Camshaft
ProBoost Camshaft Installation Instructions
(Small Block Chevy – Hydraulic Flat Tappet)
⚠️ Important Notice:
Camshaft installation requires precision measurements, specialty tools, and engine-building expertise. This procedure should only be performed and tested by a professional engine builder. Improper installation may cause severe engine damage and void warranty.📦 Tools & Supplies Needed
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Torque wrench
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Harmonic balancer puller
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Camshaft installation handle (recommended)
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Engine assembly lube / moly cam lube
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Break-in oil (high-zinc, ZDDP)
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New hydraulic flat tappet lifters (required)
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Timing set (double roller recommended)
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Gasket set (timing cover, intake, valve covers, etc.)
🔧 Installation Steps
1. Preparation
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Disconnect battery.
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Drain coolant and remove radiator (to avoid damage when sliding camshaft in/out).
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Remove distributor, carb/throttle body, intake manifold, valve covers, rocker arms, pushrods, lifters, timing cover, and timing set.
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Carefully remove old camshaft.
2. Camshaft Installation
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Thoroughly clean cam journals and lifter bores.
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Apply a generous coat of moly camshaft assembly lube to all lobes and journals.
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Slowly slide the new ProBoost camshaft into the block using a steady hand or cam handle.
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Install new timing set and align timing marks (dot-to-dot).
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Verify proper end play (typically .004"–.010").
3. Lifter & Valve Train Setup
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Always install new hydraulic lifters with a new flat tappet camshaft.
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Coat each lifter bottom with assembly lube before inserting into lifter bores.
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Install pushrods and rocker arms.
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Set lifter preload:
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Rotate engine to place each cylinder at TDC on compression stroke.
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Tighten rocker nut until pushrod has zero lash (no up/down movement), then add ½–¾ turn for preload.
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4. Final Assembly
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Reinstall timing cover, harmonic balancer, intake manifold, distributor, valve covers, carb/throttle body, and accessories.
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Fill crankcase with high-zinc break-in oil and prime oiling system before startup.
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Refill coolant and reconnect battery.
🔥 Break-In Procedure (Critical for Flat Tappet Cams)
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Start engine and immediately bring RPM to 2,000–2,500.
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Hold between 2,000–2,500 RPM for 20–30 minutes, varying RPM slightly.
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Monitor oil pressure, coolant temp, and check for leaks.
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Do not allow the engine to idle during break-in.
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After break-in, change oil and filter. Use high-zinc oil for continued camshaft protection.
⚡ Recommended Checks
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Verify piston-to-valve clearance before final assembly (especially if heads are milled or aftermarket pistons are used).
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Confirm valve spring pressures are within camshaft specifications (.440"/.420" lift).
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A professional dyno tune or carb jetting is strongly recommended for boosted applications.
✅ Your ProBoost Street Camshaft is now ready to deliver reliable boosted performance. Installation and testing must only be performed by a professional engine builder.
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