COMP Cams Camshaft CS 301QnHR-6
COMP Cams Camshaft CS 301QnHR-6
Description
DR 248/256 HrlrSBC
Drag Race 248/256 Hydraulic Roller Cam. WARNING: Camshaft Optimized for use with a Melanized or Nitrided distributor Gear. Not compatible with cast or Steel Gears without similar surface treatments. Failure to utilize the proper distributor Gear will void all warranties and/or return policies.
Additional Information
Good 1/8" mile bracket race cam. Needs 10:1+ compression and 8500+ stall.
Application Summary
Fits Chevrolet GEN 1 Small Blocks including the 262, 265, 267, 283, 302, 305, 307, 327, 350 and 400. Does not fit LT1/LT4, or factory roller Small Blocks built from 1985 and newer. GM gradually added roller camshafts to 305's and 350's from the mid 80's forward. Camaros/Firebirds/Corvettes received the roller cams early, but many trucks and SUV's had flat tappet cams until the mid 90's. Remove the intake or timing cover to confirm whether the block is a factory roller or flat tappet. Does not fit the LS1, LS2, LS3 or any LS-based 4.8, 5.3, 5.7, 6.0 and 6.2. 1955-1957 Chevrolet 265 engines require a groove on the 5th cam journal for oiling. Contact us for more information.
Part Type
Engine Camshaft
Product Overview
Fits Chevrolet GEN 1 Small Blocks including the 262, 265, 267, 283, 302, 305, 307, 327, 350 and 400. Does not fit LT1/LT4, or factory roller Small Blocks built from 1985 and newer. GM gradually added roller camshafts to 305's and 350's from the mid 80's forward. Camaros/Firebirds/Corvettes received the roller cams early, but many trucks and SUV's had flat tappet cams until the mid 90's. Remove the intake or timing cover to confirm whether the block is a factory roller or flat tappet. Does not fit the LS1, LS2, LS3 or any LS-based 4.8, 5.3, 5.7, 6.0 and 6.2. 1955-1957 Chevrolet 265 engines require a groove on the 5th cam journal for oiling. Contact us for more information.
Features
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Specifications
Product Details
| Advertised Exhaust Duration: | 311 |
| Advertised Intake Duration: | 301 |
| Assembly Lubricant Included: | No |
| Basic Operating RPM Range: | 3,500-6,500 |
| C.A.R.B. Exempt for Federally Certified Vehicles Manufactured Before 1967?: | Yes, but must meet tailpipe emission standards for year of vehicle. |
| C.A.R.B. Exempt for Foreign Vehicles Manufactured Before 1967?: | Yes, but must meet tailpipe emission standards for year of vehicle. |
| C.A.R.B. Exempt for On-Road Vehicles?: | No |
| C.A.R.B. Exempt for Racing and Off-Road Only Vehicles?: | Yes, but must be a race/competition only vehicle. |
| Cam Type: | Hydraulic Roller |
| Camshaft Gear Attachment: | 3-Bolt |
| Camshaft Material: | Billet Steel |
| Camshaft Series: | Drag Race |
| Description: | Drag Race 248/256 Hydraulic Roller Cam for Chevrolet Small Block |
| Engine Family: | Chevrolet 262-400 c.i. 8 Cylinder (1958-1998) |
| Exhaust Duration @ .050 in.: | 256 |
| Exhaust Duration at .050 inch Lift: | 256 |
| Exhaust Duration: | 311 |
| Exhaust Valve Lift(in): | 0.582 |
| Exhaust Valve Lift: | 0.582 |
| Grind Number: | 301QNHR-6 |
| Intake Duration @ .050 in.: | 248 |
| Intake Duration at .050 Inch Lift: | 248 |
| Intake Duration: | 301 |
| Intake Valve Lift(in): | 0.597 |
| Intake Valve Lift: | 0.597 |
| Lifter Type: | Hydraulic Roller |
| Lifters Included: | No |
| Part Number: | cca12-870-11 |
| RPM Range: | 3500-6500 |
| Title: | Drag Race 248/256 Hydraulic Roller Cam for Chevrolet Small Block |
| Usage: | Strip |
| Valve Springs Required: | Yes |
Product Downloads
Installation guides, warranty details, and other supporting documents are provided by the supplier. In some cases, these files may originate from regions outside your locale, meaning instructions, warranty procedures, and images may not fully align with your specific vehicle or region (e.g., LHD vs. RHD differences, return policies, etc.). If you need clarification, please contact a StreetFX support agent.
Reference Information
| Reference Data (Provide these details to our support team) | |
|---|---|
| Brand Name/s | Comp Cams, Comp Cams (edelbrock) |
| StreetFX SKU | cca12-870-11 |
| SFX Item ID | 4118879 |
| Accounting SKU | cca-12-870-11 |
| Manufacturer SKU | 12-870-11 |
| Manufacturer UPC | 036584265474 |
| Alternative References | 12-870-11, CCA-12-870-11 |
Camshaft, Hydraulic Roller, Duration 301 Int./311 Exh., Lift 0.597 Int./0.582 Exh., Lobe Separation 106, Chevy, SBC, 262-400, Each
COMP Cams drag race camshafts are offered in four styles: hydraulic flat tappet, hydraulic roller tappet, mechanical roller tappet, and mechanical flat tappet. These cams are ideal for the performance demands of the dragstrip, as well as street, strip, Circle Track, and other applications. Over a hundred models are available; choose the camshaft designed for your vehicle and engine family.
| Product Attributes | |
|---|---|
| Brand | COMP Cams |
| Manufacturer's Part Number | 12-870-11 |
| Part Type | Camshafts |
| Product Line | COMP Cams Drag Race Camshafts |
| UPC | 036584265474 |
| Cam Style | Hydraulic roller, Retro-fit |
| Camshaft Use | Drag race |
| Basic Operating RPM Range | 3,500-6,500 |
| Intake Duration at 050 inch Lift | 248 |
| Exhaust Duration at 050 inch Lift | 256 |
| Duration at 050 inch Lift | 248 int./256 exh. |
| Advertised Intake Duration | 301 |
| Advertised Exhaust Duration | 311 |
| Advertised Duration | 301 int./311 exh. |
| Intake Valve Lift with Factory Rocker Arm Ratio | 0.597 in. |
| Exhaust Valve Lift with Factory Rocker Arm Ratio | 0.582 in. |
| Valve Lift with Factory Rocker Arm Ratio | 0.597 int./0.582 exh. |
| Camshaft Gear Attachment | 3-bolt |
| Remanufactured | No |
| Computer-Controlled Compatible | No |
| Grind Number | 301QNHR-6 |
| Valve Springs Required | Yes |
| Quantity | Sold individually. |
Compatibility
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