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COMP Cams 11-740-9

Drag Race Mechanical Roller Camshaft Lift .748"/.748" Duration 321/336 RPM Range 5000-7500



COMP Cams 11-740-9

Part Number: 249-11-740-9

Drag Race Mechanical Roller Camshaft
Lift .748"/.748"
Duration 321/336
RPM Range 5000-7500
$319.99
Ships 09/26/16
if Ordered Today
FREE Shipping
COMP Cams 11-740-9 Drag Race Mechanical Roller Camshaft Lift .748"/.748" Duration 321/336 RPM Range 5000-7500 $319.99

COMP Cams 11-740-9 Details

Chevy 396-454ci Big Block 1965-96

*Note: In order to use these camshafts in 1965-66 396/427ci blocks, it is necessary to machine a 3/16'' wide x 7/64'' deep groove in the rear main journal of the cam to allow oil flow to the top of the engine.

** Note: Requires upgraded gear, thrust button & wear plate.

Super Comp, 5000 stall converter, 500+ ci

Operating Range:5000-7500 RPM
Duration Advertised:321° Intake / 336° Exhaust
Duration @ .050'' Lift:286° Intake / 298° Exhaust
Valve Lift w/1.7 Rockers:.748'' Intake / .748'' Exhaust
Valve Setting:.028'' Intake / .030'' Exhaust
Lobe Separation Angle:112°

Specifications:

Exhaust Valve Lift (in.)
0.748
Intake Valve Lift (in.)
0.748
Int. Duration @ .050 in. (Deg)
286
Exh. Duration @ .050 in. (Deg)
298
Int. Duration Advertised (Deg)
321-4
Exh. Duration Advertised (Deg)
336-5
RPM Range
5000-7500
Engine Make/Size
Chevy Big Block (396-454)
Lifter Type
Mechanical Roller
Usage
Strip
Lobe Separation (Deg)
112
Advertised Duration
321 int./336 exh.
Advertised Exhaust Duration
336
Advertised Intake Duration
321
Basic Operating RPM Range
5,000-7,500
Cam Style
Mechanical roller tappet
Computer-Controlled Compatible
No
Duration at 050 inch Lift
286 int./298 exh.
Exhaust Duration at 050 inch Lift
298
Exhaust Valve Lash (in.)
0.03
Exhaust Valve Lift with Factory Rocker Arm Ratio (
0.748
Grind Number
CB 321JR-12
Intake Duration at 050 inch Lift
286
Intake Valve Lash (in.)
0.028
Intake Valve Lift with Factory Rocker Arm Ratio (i
0.748
Quantity
Sold individually
Valve Lift with Factory Rocker Arm Ratio
0.748 int./0.748 exh.
Valve Springs Required
Yes
Manufacturer's Part Number:
11-740-9

Roller Cam For On Demand Power

Camshafts specifically designed for use in all ''Super'' catagory cars, especially those equipped with throttle stops. These powerful Comp Cams offer crisp, immediate throttle response and excellent repeatability, plus are relatively easy on valve train parts.

Features:
  • Wide assortment of racing camshafts for all application requirements of drag, oval track and puller & mud competitors
  • Require accurate assessment of rear end gearing and other vehicle-based equipment to deliver top performance
  • Not made for street use or vehicles requiring accessory drive equipment, such as power brakes, air conditioning, etc.

    Small Kits are indicated by a SK in their part number and include Camshaft, Lifters, Timing Chain Set, Assembly Lube, Decals, and Instructions.

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