What kind of idle can I expect with this camshaft?

This camshaft is designed to produce a radical idle, which is characteristic of performance camshafts intended for pro street and bracket racing. It will be noticeably rougher and louder than a stock idle.

What stall speed torque converter is recommended for this camshaft?

The manufacturer recommends using this camshaft with a torque converter that has a stall speed of 3500 RPM or higher. This helps keep the engine in its power band during acceleration.

Does this camshaft come with break-in oil or instructions?

This camshaft does not include break-in oil. It is crucial to use a proper break-in oil additive or a camshaft specifically formulated for flat tappet engines during the initial startup to prevent premature wear.

COMP Cams Camshaft OL 305H-10 42-237-4

Name: COMP Cams Camshaft OL 305H-10
Brand: COMP Cams
SKU: comp-cams-comp-cams-camshaft-ol-305h-10-t14-4392088
Price: 330.15 USD
Availability: BackOrder

COMP Cams Camshaft OL 305H-10

$330.15

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

COMP Cams Magnum 253/253 Hydraulic Flat Cam for Oldsmobile V8s. Radical idle for pro street and bracket racing.

Key Features

Fits 1967+ Oldsmobile 260, 307, 350, 403, 400, 425 and 455 V8 engines.
Magnum hydraulic flat tappet camshaft design.
253 degrees intake and 253 degrees exhaust duration.
Suitable for pro street and bracket racing applications.
Recommended for use with 3500+ stall torque converters and low gears.
Produces a radical idle sound.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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Will this fit your vehicle?

Product Details

If you're building a pro street or bracket race Oldsmobile with a larger V8 engine, this COMP Cams Magnum camshaft is a solid option to consider. It's designed to work well with a 3500+ stall torque converter and low rear-end gears, making it suitable for drag strip duty where quick acceleration is key.

This is a hydraulic flat tappet camshaft, meaning it uses a simple and well-known valvetrain design. The grind features a 253-degree intake and 253-degree exhaust duration, which contributes to its radical idle sound and strong performance in the mid-to-upper RPM range. It's built for Oldsmobile 260, 307, 350, 403, 400, 425, and 455 cubic inch V8 engines, fitting a wide range of vehicles from 1967 through the early 1990s, including popular models like the Cutlass Supreme and Delta 88.

When installing this camshaft, remember that it's intended for performance applications and will produce a noticeable, aggressive idle. Ensure your engine's cooling system and fuel delivery are up to the task of supporting its increased performance demands.