JEGS Performance Products#555-514060Cylinder Head
JEGS Performance Products 514060 - JEGS Big Block Chevy Cylinder Heads Details
290cc Intake Runner
A356-A Virgin Grade, Heat Treated to T-6
Alloy, For use with Unleaded Gasoline
Rocker Stud Size
3/8" Hardened, Must Check Length
Chrome Moly Steel (7 Degree)
7 Degree (HD)
I.D. Locator - 1.570" x 0.060"
130# @ 1.880"
350# @ 1.280"
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
JEGS 555-20518 or equivalent
Standard Big Block Chevy for 7/16"-24 Stud
JEGS 555-210142 or equivalent
Accessory Bolt Locations
Valve Stem Diameter
Valve Stem Seal Diameter
2.325"H x 1.625"W
1.780"H x 1.950"W
378 CFM @ 0.700" Lift (28" H20)
265 CFM @ 0.700" Lift (28" H20)
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.