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Edelbrock 61555

Marine Performer RPM Aluminum Cylinder Heads for Rectangle Port Big Block Chevy

Edelbrock 61555


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Estimated ship date 09/01/17 if Ordered Today
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Edelbrock 61555 Marine Performer RPM Aluminum Cylinder Heads for Rectangle Port Big Block Chevy $1,186.02
  • Marine Big Block Chevy 396-502ci
  • Valve Springs for Hydraulic Roller
  • Port Volume: 290cc/110cc
  • Valve Size: 2.25"/1.89"
  • 118cc Combustion Chambers
  • Bare with Valves, Sold Individually

  • Edelbrock 61555 Details

    These Edelbrock marine cylinder heads include severe-duty, 1.89'' inconel exhaust valves for the added durability needed in marine applications and have one-piece stainless steel 2.25'' intake valves with hardened tips and swirl-polished heads.

    Tech Tip: To gain more spark plug clearance, Edelbrock recommends using Champion RC Series plugs such as the RC12YC (P/N 192-49776). They are 0.230'' shorter than a conventional spark plug and have a 5/8'' hex for easier access.

    Combustion Chamber Volume:110cc
    Intake Runner Volume:290cc
    Exhaust Runner Volume:118cc
    Intake Valve Diameter:2.25''
    Exhaust Valve Diameter:1.89''
    Valve Stem Diameter:11/32''
    Valve Guides:Manganese Bronze
    Deck Thickness:9/16''
    Valve Spring Maximum Lift:N/A
    Rocker Stud:7/16''
    Guideplate:Hardened Steel 3/8''
    Pushrod Diameter:3/8''
    Valve Angle:26°
    Exhaust Port Location:Stock
    Spark Plug Fitment:14mm x 3/4'' Reach,
    Gasket Seat


    Engine Make/Size
    Chevy Big Block (396-502)
    Requires Professional Preparation (Bare)
    Cylinder Head Type
    Chevy Small Block
    Manufacturer's Part Number:

    Edelbrock Performer RPM Oval Port Cylinder Heads
    These oval port heads will support over 540 hp with 9.5:1 compression when used as part of the Edelbrock Total Power Package. The unique oval intake port shape produces flow similar to rectangular ports, but the smaller port size provides excellent seat-of-the-pants performance and crisp throttle response. The semi-open chamber design maximizes efficiency with streetable compression ratios and the smaller-than-stock 11/32'' valve stems promote excellent flow and lighter valve weight.

    Edelbrock Performer RPM High Compression Oval Port Cylinder Heads
    These oval port heads are similar to the ones above with 100cc semi-open combustion chambers created by angle milling at a 1.5 degree angle to improve intake port alignment and create a smaller chamber without valve shrouding. They create an ideal street compression ratio of 9.2:1 when used with flat top pistons. Smaller-than-stock 11/32'' valve stems promote excellent flow and lighter valve weight.

    Edelbrock Performer RPM Rectangle Port Cylinder Heads
    These rectangle port heads are designed for street/high-performance big-blocks operating from 2500-7000 RPM. The specially designed ports offer increased flow and velocity over standard big-block heads. These heads feature highly-efficient 118cc open-style combustion chamber and high-velocity 315cc long/300cc short intake ports. Smaller-than-stock 11/32'' valve stems promote excellent flow and lighter valve weight.

    Marine Performer RPM Cylinder Heads
    The Marine Performer RPM heads feature heavy-duty, 1.89'' Inconel exhaust valves that provide added durability for marine applications. They are hard anodized to protect the aluminum in the harsh marine environment. These heads use smaller-than-stock 11/32'' valve stems to promote excellent flow and lighter valve weight. Match them with an Edelbrock Performer RPM manifold, Performer Series 750 cfm marine carb and Performer RPM cam for proven high-performance!

    Cylinder Head Specifications
    Oval PortRectangle Port
    Combustion Chamber Volume110cc (Standard)
    100cc (High Compression)
    Intake Runner Volume290cc315cc
    Exhaust Runner Volume110cc110cc
    Intake Valve Diameter2.19"2.19"
    Exhaust Valve Diameter1.88"1.88"
    Valve Stem Diameter11/32"11/32"
    Valve GuidesManganese BronzeManganese Bronze
    Deck Thickness9/16"9/16"
    Valve Spring Diameter 1.55"1.55"
    Valve Spring Maximum Lift.700".700"
    Rocker Stud7/16"7/16"
    GuideplateHardended SteelHardended Steel
    Pushrod Diameter3/8"3/8"
    Valve Angle26°26°
    Exhaust Port LocationStockStock
    Spark Plug Fitment14mm x 3/4 reach, gasket seat14mm x 3/4 reach, gasket seat
    Made In USA!

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