REDLINE CAMS – 252/260 STREET TORQUE H.F.T.

Hydraulic Flat Tappet Camshaft | Dodge/Chrysler Small Block 273–360 (1964–1991)

Unleash the hidden torque in your Mopar Small Block with the REDLINE CAMS 252/260 Street Torque H.F.T. Designed for 273, 318, 340, and 360 small block Chrysler engines (1964–1991), this camshaft delivers the low-end grunt and midrange punch that Mopar street enthusiasts demand.

Operating in the 1,500–4,250 RPM range, this cam is perfect for daily drivers, weekend cruisers, and street/strip builds that need more muscle without sacrificing drivability or vacuum for power brakes. A true Stage 1 street cam, it offers the classic lope and sound of a performance cam while maintaining the manners to cruise comfortably.

🔧 Camshaft Specifications

Advertised Duration: 252° / 260°
Duration @ .050": 206° / 212°
Valve Lift (with 1.5 rocker arms): .420" / .440"
Lobe Separation Angle (LSA): 106° standard
- Options: 108°, 110°, 112°, 114°
RPM Range: 1,500 – 4,250 RPM
Valve Lash: .000" intake / .000" exhaust (hydraulic design – zero lash)

📊 LSA Options – How They Affect Performance

LSA	Powerband Behavior	Idle Quality	Vacuum / Accessories	Best For
106° (Standard)	Hard-hitting low-end, max torque response	Rough lope	Lower vacuum	Muscle cars, street rods wanting sound & punch
108°	Strong torque, slightly smoother idle	Noticeable lope	Moderate vacuum	Street/strip use
110°	Balanced torque & midrange power	Mild lope	Good vacuum	Street performance builds
112°	Broader RPM range, better top-end	Smooth idle	Strong vacuum	Daily-driven Mopars, power brakes
114°	Softest low-end, smoothest power delivery

✅ Recommended Upgrades

Performance valve springs (rated for lift)
New lifters (required with flat tappet cams)
High-zinc (ZDDP) break-in oil & moly assembly lube
Dual exhaust or headers for better breathing
3.23–3.73 rear gears for spirited street driving
Upgraded timing set & hardened pushrods

🚦 Best Used For

Classic Dodge Darts, Demons, Dusters & A-bodies
Mopar B- & F-bodies with 318 or 360 power
Street builds that need strong low-end torque
Daily drivers with power brakes
Weekend cruisers that want a classic lopey sound

⚡ Why Choose REDLINE CAMS?

✔ Mopar-specific lobe designs for real-world torque
✔ Wide LSA tuning options for any build style
✔ Reliable performance for street and strip
✔ Built on decades of camshaft engineering expertise

252/260 STREET TORQUE H.F.T. Dodge/Chrysler Small Block 273–360 (1964–1991)

Name: 252/260 STREET TORQUE H.F.T. Dodge/Chrysler Small Block 273–360 (1964–1991)
Brand: Redline Cam’s

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🛠 Installation Instructions – REDLINE CAMS Hydraulic Flat Tappet Camshaft

Application: Dodge/Chrysler Small Block V8 (273, 318, 340, 360 – 1964–1991)

⚠️ Important Notes Before You Begin

Always use new lifters with a new flat tappet camshaft.

Use high-zinc break-in oil (ZDDP) and moly assembly lube.

Verify valve spring pressures are compatible with cam specs.

Always check retainer-to-seal clearance, pushrod length, and piston-to-valve clearance.

Recommended valve lash: .000” intake / .000” exhaust (hydraulic zero lash).

🔧 Step-by-Step Installation

1. Preparation

Disconnect battery and drain coolant.

Remove radiator, fan, belts, valve covers, intake manifold, timing cover, and timing set.

Remove distributor and mark rotor position for correct re-installation.

Remove old camshaft and lifters. Inspect cam bearings and journals for wear.

2. Camshaft Installation

Apply assembly lube generously to cam lobes and journals.

Carefully slide new camshaft into block, avoiding nicks or scratches.

Install new camshaft thrust plate (if applicable) and torque to spec.

3. Timing Set & Degreeing

Install new double-roller timing chain set.

Align timing marks:

Dot-to-Dot method (crank dot at 12 o’clock, cam dot at 6 o’clock).

Torque cam gear bolts to spec with thread locker.

If possible, degree the camshaft to verify proper installation.

4. Lifters & Pushrods

Coat new hydraulic lifters with assembly lube.

Install lifters into their bores.

Insert pushrods and rocker arms.

5. Valve Lash / Preload

Rotate engine to TDC firing position for #1 cylinder.

Adjust hydraulic lifters to zero lash (tighten rocker nut until pushrod just stops spinning freely).

Add 1/4–1/2 turn preload to each rocker.

Repeat for all cylinders following the firing order (1-8-4-3-6-5-7-2).

6. Reassembly

Reinstall timing cover, intake manifold, valve covers, water pump, belts, radiator, and accessories.

Reinstall distributor, setting timing near initial spec (10–12° BTDC is a good starting point).

7. Camshaft Break-In Procedure (Critical!)

Fill engine with high-zinc break-in oil.

Prime oiling system before startup.

Start engine and immediately hold at 2,000–2,500 RPM for 20–30 minutes.

Vary RPM slightly during break-in; do not let the engine idle.

Monitor oil pressure, coolant temp, and check for leaks.

8. Post Break-In

Change oil and filter after 30 minutes.

Refill with high-zinc oil for the first 500 miles.

Recheck ignition timing and adjust as needed.

Verify idle vacuum and make carburetor/EFI adjustments.

✅ Recommended Supporting Upgrades

Performance valve springs matched to cam lift/duration

High-flow timing set

Hardened pushrods & steel retainers

Headers & free-flowing exhaust

Performance ignition timing (initial ~12–16° BTDC, total ~34°)

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252/260 STREET TORQUE H.F.T. Dodge/Chrysler Small Block 273–360 (1964–1991)

Install instructions