Edelbrock | Performer RPM Cylinder Head - 5.7L 1975-1976

Edelbrock - Engine Cylinder Head

Description

Intended for installation on 1965-1976 Small-Block Oldsmobile 350-403 c.i. engines equipped with a flat tappet camshaft, these 356-T6 aluminum casting cylinder heads (PN61039) are a modern refinement to our PN6051 heads, except they can accommodate a factory-style mechanical fuel pump. A smaller 68 cc combustion chamber achieves a more appropriate small block compression ratio compared to our PN61025/61029’s larger 77 cc chamber, which yields a lower compression ratio than most engine builders desire on a small block engine. These heads require a 3.9375” minimum bore and feature a modern chamber design with optimized spark plug positioning. Maximum airflow is achieved through the factory 6-degree valve angle using high-flow 200 cc intake and 130 cc exhaust port volumes, along with 2.072” intake and 1.680” exhaust valve sizes in their O.E. positions. A finished deck thickness with added material above the intake port and pre-counterbored head-bolt holes for .5” diameter studs provide extra clamping force in key areas. A stud-and-guide plate valvetrain system (as opposed to the O.E. pedestal type) provides a solid foundation for the beefier diameter pushrods, and Helicoil inserts in the exhaust and rocker stud holes keep bolts secured. However, there are no provisions for a heat crossover. Although these heads will fit on Big-Block Oldsmobile engines, the 68-cc combustion chamber size is not ideal for a big-block application as it will raise compression. See PN 61025 and PN 61029 for big-block specific cylinder heads.

Characteristics

• 10: Aluminum
• 10025: Yes
• 10247: 130
• 10248: 0.3438 IN
• 10249: 0.34375 IN
• 10250: 6
• 10251: 6
• 10252: Chromoly Steel
• 10253: Rectangle
• 10254: Square
• 10255: Manganese Bronze
• 10266: No
• 10271: No
• 10582: No
• 10671: Yes
• 4624: .545 IN
• 6626: 68
• 6627: 200
• 6628: 2.15 IN
• 6629: 1.680 IN
• 6631: .600 IN
• 6634: Yes
• 8788: Yes
• CNC Machined Exhaust Port: No
• CNC Machined Intake Port: No
• Cross sell / Upsell Part Numbers: 311105 - Super StreetFighter TH350 6" Tailshaft Non Lock-Up (Buick/Oldsmobile/Pontiac) K42-222-4 - Xtreme Energy 218/224 Hydraulic Flat Cam K-Kit for Oldsmobile 260-455
• Cylinder Head Style: Assembled
• Exhaust Port Location: Standard
• Exhaust Valve Job Diameter: 1.680 IN
• Exhaust Valve Stem Diameter: 11/32 IN
• Guide plate Pushrod Size: 46089 IN
• Intake Port Location: Standard
• Intake Valve Job Diameter: 2.15
• Intake Valve Stem Diameter: 11/32 IN
• Quantity: Single
• Related Products: 2156 - Performer Intake Manifold for 1965-79 Pontiac 326-455 Non-EGR 7156 - Performer RPM Pontiac 326-455 Intake Manifold 7373 - Engine Gasket Set (Head / Intake / Exhaust / Valve Cover) for Oldsmobile 4485 - Signature Series Valve Covers for Oldsmobile 350-455 V8 3712 - Performer-Plus Camshaft Kit for Small-Block Oldsmobile 350-403 V8 22764 - Edelbrock Max-Fire Distributor for Oldsmobile 260-455 V8 85582 - Edelbrock E-Series Cylinder Head Bolt Kit 85582 for Oldsmobile big-block 3113KT - Adjustable Double Roller Timing Set for Oldsmobile 400-455
• Required Products: 7340 - Cylinder Head Gasket Set for Oldsmobile 7238 - Exhaust Manifold Gasket Set for Oldsmobile 7284 - Intake Manifold Gasket for 1965-76 400-425-455 Oldsmobile engines 7598 - Valve Cover Gasket Set for Oldsmobile
• Retainer Diameter: 1.055 IN
• Retainer Lock Style: 7
• Retainer Material: Steel
• Steam Holes Drilled: No
• Valve Cover Mounting Style: Perimeter Bolt
• Valve Guide Size O.D: .545 IN
• Valve Lock Material: Steel
• Valve Lock Style: Single Groove
• Valve Spring Type: Beehive

Attributs

• Allows the use of an "OEM" style mechanical fuel pump
• Factory 6-degree valve angle
• Maximum compatibility with OEM and aftermarket components
• Mechanical Fuel Pump Clearance Cutout
• OEM Port Locations
• Retains compatibility with OEM and popular aftermarket manifolds and Headers

Note:

• Livraison GRATUITE / FREE Delivery