Comp Cams  Magnum  Mechanical Flat Tappet Camshafts
InfoVehicle Info Needed
COMP CAMSPART NUMBER: 249-K12-225-4

Comp Cams Magnum Mechanical Flat Tappet Camshafts

$79695
ShippingShips on 10/19/2026
Lowest PriceLowest Price Guarantee

Chevy 262-400ci Small Block 1955-98
    Magnum 306S Mechanical Flat Tappet Camshaft Complete Kit
    Lift: .555''/.555"
    Duration: 306°/306°
    Lobe Separation Angle: 110°
    RPM Range: 3000-7000


    *Note: In order to use these camshafts in 1955-57 265ci blocks, it is necessary to machine a small groove in the rear main journal of the cam to allow oil flow to the top of the engine.

    Street/Strip. 3500+ stall converter, 10.5:1 compression. low gears, headers and intake. Racy idle.

    Operating Range:3000-7000 RPM
    Duration Advertised:306° Intake / 306° Exhaust
    Duration @ .050' Lift:260° Intake / 260° Exhaust
    Valve Lift w/1.5 Rockers:.555' Intake / .555' Exhaust
    Valve Setting:.022' Intake / .022' Exhaust
    Lobe Separation Angle:110°

    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


    Street/strip. 3500+ stall, 10.5:1 compression. Low gears, headers and intake. Racy idle.

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 Kit
BrandCOMP CAMS
Package Height5.3
Package Width10.5
Package Length25.5
Weight22.6 PG
Part CategoryPerformance Parts
Exh. Duration @ .050 In. (Deg)260
Cam StyleMechanical flat tappet
Grind NumberCS 306S-10
Exh. Duration Advertised (Deg)306
Locks IncludedYes
Engine Make/SizeChevy Small Block (262-400)
Retainers IncludedYes
Intake Valve Lift With Factory Rocker Arm Ratio (I0.555
Int. Duration @ .050 In. (Deg)260
Assembly Lubricant IncludedYes
Basic Operating Rpm Range3,000-7,000
Pushrods IncludedNo
Gaskets IncludedNo
Intake Valve Lash0.022 in (0.559 mm)
Rocker Arms IncludedNo
Intake Valve Lift0.555 in (14.097 mm)
Computer-Controlled CompatibleNo
Int. Duration Advertised (Deg)306
Lobe Separation (Deg)110
Rpm Range3000-7000
Lifter StyleMechanical flat tappet
Advertised Duration306 int./306 exh.
Exhaust Valve Lift With Factory Rocker Arm Ratio (0.555
Valve Springs IncludedYes
UsageStreet/Strip
Valve Lift With Factory Rocker Arm Ratio0.555 int./0.555 exh.
QuantitySold as a kit
Valve Stem Seals IncludedYes
Exhaust Valve Lash0.022 in (0.559 mm)
Exhaust Valve Lift0.555 in (14.097 mm)
Advertised Intake Duration306
Outside Diameter Of Outer Spring1.43 in (36.3 mm)
Intake Duration At 050 Inch Lift260
Exhaust Duration At 050 Inch Lift260
Timing Chain StyleDouble non-roller
Timing Chain And Gears IncludedYes
Advertised Exhaust Duration306
Lifter TypeMechanical Flat Tappet
Part FitmentSemi Universal
Duration At 050 Inch Lift260 int./260 exh.
Valve Springs RequiredNo
Lifters IncludedYes
Vendor Part NumberK12-225-4
Package Qty1
Package TypeEA
No Questions
No Reviews

Items You Need

Universal Camshaft Installation/Removal Tool Includes 4 camshaft adapters

JEGS

Universal Camshaft Installation/Removal Tool Includes 4 camshaft adapters

Part Number : 555-80599
$4779$51.99
You Save$4.20
Precision Cam Degree Wheel Kit [11 in.]

JEGS

Precision Cam Degree Wheel Kit [11 in.]

Part Number : 555-81621
$14699$161.99
You Save$15.00
Valve Spring Compressor [Stud Mount]

JEGS

Valve Spring Compressor [Stud Mount]

Part Number : 555-80518
$919$9.99
You Save$0.80
Engine Assembly Lube [4 oz. Bottle]

JEGS

Engine Assembly Lube [4 oz. Bottle]

Part Number : 555-28000
$589$6.99
You Save$1.10
159 Engine Break-In Oil Additive [12-Ounce]

COMP CAMS

159 Engine Break-In Oil Additive [12-Ounce]

Part Number : 249-159
$2395
Valve Spring Compressor [Stud Mount]

JEGS

Valve Spring Compressor [Stud Mount]

Part Number : 555-80521
$5299$57.19
You Save$4.20
Break-In/Engine Oil Supplement [12 oz. Bottle]

JEGS

Break-In/Engine Oil Supplement [12 oz. Bottle]

Part Number : 555-28060
$1009$11.99
You Save$1.90
Valvetrain Checking Springs Light tension springs

JEGS

Valvetrain Checking Springs Light tension springs

Part Number : 555-80523
$839$8.99
You Save$0.60
Some parts are not legal for use in California or other states with similar laws / regulations
p65 warning
Your Cart

Your shopping cart is empty!