JEGS Performance Products 51475 - JEGS BB-Chevy Aluminum Heads

JEGS Performance Products #555-51475

BB-Chevy CNC Profile Aluminum Heads

2.30''/1.88'' Stainless Steel Valves

1.625'' Springs, 240 lbs. @ 2.050''

.750'' Max Lift Mechanical Roller

Assembled, Sold as Each

1 available at this price, please call before ordering

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Installation Instructions for JEGS Performance Products 51475 - JEGS BB-Chevy Aluminum Heads

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JEGS Performance Products 51475 - JEGS BB-Chevy Aluminum Heads Details

BB-Chevy Aluminum Cylinder Heads - 350cc Intake Ports, 119cc CNC Profile Machined Combustions Chambers

JEGS Cylinder Head Specifications
Part # 51475 24.5 Degree, BB-Chevrolet

Materials

Casting: A356-A Virgin Grade, Heat Treated to T-6

Valve Guides: Manganese Bronze

Valve Seats: Alloy, For use with Unleaded Gasoline

Combustion Chamber: 119cc CNC-Profile Machined

Intake

Port Volume: 350cc

Valve Diameter: 2.300'' Stainless Steel, # 555-20571

Valve Length: 5.375''

Valve Stem Diameter: 11/32''

Valve Stem Seal Diameter: .531'' Teflon

Port Dimension: 2.450'' x 1.750'' Rectangular

Flow: 382 cfm @ .900'' lift 28'' of water

Gasket: JEGS # 555-210100

Exhaust

Port Volume: 142cc

Valve Diameter: 1.880'' Stainless Steel, # 555-20575

Valve Length: 5.425''

Valve Stem Diameter: 11/32''

Valve Stem Seal Diameter: .531'', Teflon

Port Dimension: 1.625'' x 1.900'' Modified ''D'' Shape

Flow: 322 cfm @ .900'' lift 28'' of water

Gasket: JEGS # 555-210150

Valve Train

Stud Size: 7/16'', 7/16'' 14 x .875''(bottom) 7/16'' 20 x 1.950'' (top), # 555-20526

Guide Plates: Big Block Chevrolet

Retainers: Chrome Moly Steel 10 degree, # 555-20532

Valve Locks: 10 degree

Pushrods: 3/8'' Heat Treated, Must Check Length

Springs: 1.625'' Springs, 240 lbs @ 2.050'', .750'' Maximum Lift, Roller Lifter, # 555-20546

Spring Cups: .570'' Inside Diameter Locater, .060'' thick # 555-20551

Accessories

Head Bolts: Exhaust Upper Row, 5 Bolts per Head Longer Use # 070-135-3612, Complete Kit # 070-135-3702

Head Studs: ARP # 070-235-4102

Spark Plug: 14mm 3/4'' reach 5/8'' Hex with Washer Seat

Stud Girdle: # 555-20518

Rocker Arms: Big Block Chevrolet

Head Gasket: Fel-Pro # 375-1017-1, JEGS # 555-210141 or equivalent for MarkIV Block, Fel-Pro # 375-17048 or equivalent for Gen V and Gen VI Block

Head Fastener Washers: Use Quality Hardened Washers

Accessory Bolt Locations: Stock Placement

Torque Specifications

Rocker Studs: 45 ft/lbs.

Manifold Bolts: 35 ft/lbs.

Head Fasteners: See Manufacturers Specifications

Performance Engineered!

Our big-block J-Series heads use the same airflow technology that our Pro Stock brigade has built and incorporated over the years to produce big horsepower! Every head is cast from virgin A356 aluminum, heat treated to a T6 condition for long lasting performance and precision CNC-machined. Complete heads include bronze guides, 10° locks, steel retainers, 7/16'' rocker studs and 3/8'' guide plates. Drilled and tapped for accessories. We use longer valves so you will need to check pushrod length. Exhaust port raised .625''. Made in USA.

Note: Requires five longer than stock head bolts for each head (part # 070-135-3612 sold separately).

While Supply Lasts!