|Cast and heat treated at the Edelbrock Foundry and machined at Edelbrock's manufacturing facility in the USA, Edelbrock heads are the best in quality and performance. All Edelbrock Cylinder Heads are designed from scratch using the latest in computer technology by our own highly skilled engineer's. Using highly efficient ports and state-of-the-art combustion chamber shapes, Edelbrock cylinder heads offer improved performance throughout the rpm range for great throttle response and top-end horsepower. Top-quality features include threaded inserts in rocker stud and exhaust bolt holes for superior strength and durability, and manganese-bronze valve guides with ductile iron valve seats. These are features that some other companies don't include!
Edelbrock's NHRA Accepted High Performance Aluminum Cylinder Heads have been submitted to the NHRA for approval and have been accepted for STOCK/SUPER STOCK Classes where indentified below. They are easily identifiable as they all include the NHRA Oval Logo engraved on both ends of the cylinder head casting, with their specific part number below.
It is up to the racer and/or engine builder to make sure that the runner volume and combustion chamber CC's are no larger or smaller in volume than what their particular engine corrected horsepower is approved by the NHRA Race Committee. The runner and chamber volume CC's listed below are what they are supplied from Edelbrock, not that they are approved for this volume in your particular class.
For example: Chrysler 383-440 B/B V8 # 60917 intake runner volume measures 210cc delivered from Edelbrock, the accepted intake runner volume that is approved by NHRA needs to measure 203cc's.
NOTE: The intake runner volume may require modification to comply with Super Stock class rules. Please check NHRA rulebook for more details.