Order Status & Returns
Gift Cards
Help Center
1-800-345-4545
Vehicle Info NeededCOMP CAMSPART NUMBER: 249-12-318-4
Xtreme Marine Hydraulic Flat Tappet Camshaft Lift .464"/.464" Duration 268/276 RPM Range 2400-5400
$30995
Ships on 09/15/2026
Lowest Price GuaranteeChevrolet 262-400 c.i. 8 CYL. 1958-1998 b>
- Xtreme Marine Hydraulic Flat Tappet Camshaft
Lift .464"/.464"
Duration 268/276
RPM Range 2400-5400
Hydraulic-Good for jet boat with A impeller, strong mid range power.
265, 283, 307, 302, 305, 327, 350, 383, 400, 427, L46, L48, L65, LM1, LT-1, L82, L81, LS9, L83, L98, L05, LG3, LG4, LT1, LT4, Camaro, Corvette, Chevelle, Stingray, Silverado, C10, Firebird, Chevrolet, Chevy, Small Block Chevy, Caprice, Malibu, Impala, Nova, 355, GEN1, Monte Carlo, S10
Good for jet boat with A impeller, strong mid-range power.
Emissions Note:
This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.
CLICK THIS LINK FOR IMPORTANT CARB & EPA EMISSIONS INFORMATION ABOUT THIS PART
Part TypeCamshaft
BrandCOMP CAMS
Package Height2.9
Package Width3.0
Package Length24.2
Weight8.9 PG
Part CategoryPerformance Parts
Exh. Duration @ .050 In. (Deg)226
Cam StyleHydraulic flat tappet
Grind NumberCS 268AH-10
Exh. Duration Advertised (Deg)276-4
Engine Make/SizeChevy Small Block (262-400)
Intake Valve Lift With Factory Rocker Arm Ratio (I0.464
Int. Duration @ .050 In. (Deg)222
Basic Operating Rpm Range2,400-5,400
Intake Valve Lift0.464 in (11.786 mm)
Computer-Controlled CompatibleNo
Int. Duration Advertised (Deg)268-4
Lobe Separation (Deg)110
Rpm Range2400-5400
Advertised Duration268 int./276 exh.
Exhaust Valve Lift With Factory Rocker Arm Ratio (0.464
UsageOEM
Valve Lift With Factory Rocker Arm Ratio0.464 int./0.464 exh.
QuantitySold individually
Exhaust Valve Lift0.464 in (11.786 mm)
Advertised Intake Duration268
Intake Duration At 050 Inch Lift222
Exhaust Duration At 050 Inch Lift226
Advertised Exhaust Duration276
Lifter TypeHydraulic Flat Tappet
Duration At 050 Inch Lift222 int./226 exh.
Valve Springs RequiredYes
Vendor Part Number12-318-4
Package Qty1
Package TypeEA
No Questions
No Reviews
Items You Need
![Valve Spring Compressor [Stud Mount]](https://www.jegs.com/images/mini_200/500/555/555-80518.jpg)
![Precision Cam Degree Wheel Kit [11 in.]](https://www.jegs.com/images/mini_200/500/555/555-81621.jpg)
JEGS
Universal Camshaft Installation/Removal Tool Includes 4 camshaft adapters
Part Number : 555-80599
$4779$51.99
You Save$4.20
![Break-In/Engine Oil Supplement [12 oz. Bottle]](https://www.jegs.com/images/mini_200/500/555/555-28060.jpg)
![Valve Spring Compressor [Stud Mount]](https://www.jegs.com/images/mini_200/500/555/555-80521.jpg)
COMP CAMS
Magnum Double Roller Timing Set 1955-91 Chevy Small Block V8 265-400 (Except w/Factory Roller)
Part Number : 249-2100
$6295
![Engine Assembly Lube [4 oz. Bottle]](https://www.jegs.com/images/mini_200/500/555/555-28000.jpg)
Some parts are not legal for use in California or other states with similar laws / regulations
