JEGS Performance Products 514060 - JEGS Big Block Chevy Cylinder Heads
JEGS Performance Products#555-514060Cylinder Head |
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JEGS Performance Products 514060 - JEGS Big Block Chevy Cylinder Heads Details
290cc Intake Runner
Material
Casting
A356-A Virgin Grade, Heat Treated to T-6
Valve Guides
Manganese Bronze
Valve Seats
Alloy, For use with Unleaded Gasoline
Valve Train
Rocker Stud Size
7/16"-24
Guide Plates
3/8"
Pushrods
3/8" Hardened, Must Check Length
Spring Retainers
Chrome Moly Steel (7 Degree)
Valve Locks
7 Degree (HD)
Spring Locator
I.D. Locator - 1.570" x 0.060"
Valve Springs
Specifications
Pressure
Spring O.D.
Type
Max Lift
Coil Bind
Seat Load
Open Load
1.550"
Single
0.650"
1.150"
130# @ 1.880"
350# @ 1.280"
Accessories
Spark Plugs
14mm x 3/4" Reach - Gasket Seat - 5/8" Hex
Head Bolts *
ARP 070-135-3603 or equivalent
Head Studs *
ARP 070-235-4103 or equivalent
Stud Girdle
JEGS 555-20518 or equivalent
Rocker Arms
Standard Big Block Chevy for 7/16"-24 Stud
Head Gasket
JEGS 555-210142 or equivalent
Accessory Bolt Locations
Stock Placement
Flow Specifications
Flow GraphIntake
Exhaust
Port Volume
290cc
140cc
Valve Diameter
2.250"
(Stainless Steel)1.880"
(Stainless Steel)
Valve Length
5.340"
5.350"
Valve Stem Diameter
11/32"
11/32"
Valve Stem Seal Diameter
0.530" (Teflon)
0.530" (Teflon)
Port Dimension
2.325"H x 1.625"W
1.780"H x 1.950"W
Flow Rate
378 CFM @ 0.700" Lift (28" H20)
265 CFM @ 0.700" Lift (28" H20)
Gasket
JEGS 555-210100
or equivalentJEGS 555-210151
or equivalent
Torque Specification
Rocker Studs
45 ft/lbs.
Manifold Bolts
35 ft/lbs.
Head Bolts or Studs
Per Manufacturers Specifications
* Requires 4 longer bolts or studs over each exhaust port which are included in the recommended kits. The longer bolts and studs can also be purchased separately.
Racing technology for your high performance street engine! Our heads are cast from Virgin A356 Aluminum and heat treated to a T6 Hardness for the ultimate quality and durability. They are then machined on the latest CNC machines for accuracy and precision. We use the most up to date technology to design our intake and exhaust runners and combustion chambers for maximum performance. Our choices of intake runner volumes, combustion chamber sizes, spark plug styles and valve spring sizes insure that we have a cylinder head to suit your needs. Our cylinder heads are assembled with premium parts such as manganese valve guides, stainless steel valves and chrome-moly retainers. They feature valve seats that are compatible with unleaded fuel.
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