New Aluminum Cylinder Heads for the Hemis

[Don Kennedy]

Originally Posted by Dyno

The aluminum head is now accepted, but with an additional 10 horsepower added. But, they are better for repair if needed.

Like in Super Stock the aluminum head for the 428 Pontiac from Edelbrock has to have a part number on them with the NHRA logo will this be the case??

[Steve Stasko]

Originally Posted by Don Kennedy

Like in Super Stock the aluminum head for the 428 Pontiac from Edelbrock has to have a part number on them with the NHRA logo will this be the case??

The aluminum heads that were approved in the past for the Street Hemi combinations carried a Mopar part number. I bought mine at a local Dodge dealer. They were cast by Edelbrock for Mopar.

I did see last night the Indy 426-SR was also approved for S/S only. These are the old Canfield castings...which were essentially an aluminum version of an original head. Canfield introduced them in the mid-late 2000's, and went out of business not long after. Indy sells them as a 200cc intake port though, so they cannot be used out of the box without work.

How long will this last though? The last time NHRA approved aluminum heads for AH, they rescinded it about 3 days later.

[charlie westcott]

What does a 559 M-2 head look like?
I havent seen anything but the M-1's.

All those edelbrock heads have the wrong ex valve angle. I assume thats a typo.

[Steve Stasko]

Originally Posted by charlie westcott

What does a 559 M-2 head look like?
I havent seen anything but the M-1's.

All those edelbrock heads have the wrong ex valve angle. I assume thats a typo.

I didn't even realize they approved the Victor Jr head also and I looked right at that note. You're correct, the exhaust angle is altered 1.5 degrees from stock on those. That's why it didn't even cross my mind to check those part numbers.