Description
Model: 618269-12
The Edelbrock 618269 Big Block Chevy 12deg Pro-Port Cylinder head is designed specifically for the professional cylinder head porter and engine builder. Like the other Edelbrock Cylinder head, The Pro-Port cylinder head is also cast in the USA at the state-of-the-art Edelbrock Foundry with extra-thick walls to allow for custom CNC porting. In most cases, seats and manganese-bronze valve guides are included, but not installed. Please note: This head can not be used without professional head preparation.
Pro-Port RAW Features Include: – Unported versions of Edelbrock race-winning Victor Series CNC head for the professional cylinder head porter and engine builder – The Pro-Port cylinder head is cast in the USA at the state-of-the-art Edelbrock Foundry with extra-thick walls to allow for custom CNC porting – The only head designed specifically to accommodate almost any CNC port shape, size or location – Offers enough wall thickness for CNC machining to various port dimensions – In most cases seats and manganese-bronze valve guides are included – Some of the Edelbrock Pro-Port Raw Head Feature Our Special Hot Isostatic Pressing or HIP Process.
Model: 618369-14
9deg x 3.9deg exhaust Cylinder Head Specifications: Combustion chamber volume: 92cc Deck thickness: N/A Exhaust port location: N/A Exhaust runner volume: 189cc Exhaust valve diameter: 1.85″ (Valves Not Included) Guideplate: N/A Intake runner volume: 442 (lh) / 451 (rh) Intake valve diameter: 2.45″ (Valves Not Included) Pushrod diameter: N/A Rocker stud: Use Jesel KPS-381754 shaft-mount Spark plug fitment: 14mm x 3/4 reach, gasket seat. Intended for high output, large cubic inch racing engines with 4.84″ bore spacing, this head is an improvement over existing 18deg designs, such as the Big Chief & Big Duke. The casting is made from A-356 aluminum and is Hot Isostatic Pressing processed (HIP) for superior strength, durability, dimensional stability and exceptional finish quality.
These cylinder head features CNC ported intake ports and a raised exhaust runner design for improved flow efficiency. Chambers are fully CNC ported and extra material is included in the deck to allow fine tuning of the combustion chamber design, if desired. Edelbrock and Pat Musi worked with Jesel to improve the valvetrain geometry, delivering Pro-Stock level technology on engines up to 10,000 rpm. Jesel’s shaft-mounted system, #KPS-387154, is made from lightweight 7000 series aluminum and features a one-piece stand design that pairs the intake and exhaust stands for improved valvetrain stability.
The intake features a 1.820″ long fulcrum and is available in 1.60:1 – 1.95:1 rocker ratios the exhaust features a 2.000″ long fulcrum and available in 1.60:1 – 2.00:1 rocker ratios. Requires Edelbrock valve covers #4259. Match with Edelbrock Victor CNC Series manifolds #28003 and #28005. Pro-Port version available for custom porting. Valve angle: 18deg x 4.0deg intake Valve guides: Manganese bronze Valve spring diameter: Pocket diameter 1.76″ (springs not included) Valve spring maximum lift: N/A Valve stem diameter: N/A
