Edlebrock 60917 NHRA head

[hrs1326]

Can someone enlighten me on these heads? It seems the exhaust ports are re-positioned from stock?? Exhaust flanges shortened???
Using these on a Super Stocker and they are causing some real grief.

[Charles Stewart]

From the Edelbrock technical instructions:
Exhaust flange has been extended out .125” in order to provide dry exhaust bolt/stud holes.
From NHRA classification, they carry a penalty (weight/ratio HP) for using those heads.
https://edelbrock-instructions-v1.s3...rock/60917.pdf

[Mike Pearson]

Originally Posted by Charles Stewart

From the Edelbrock technical instructions:
Exhaust flange has been extended out .125” in order to provide dry exhaust bolt/stud holes.
From NHRA classification, they carry a penalty (weight/ratio HP) for using those heads.
https://edelbrock-instructions-v1.s3...rock/60917.pdf

You can bet that anyone running those heads in SS has that extra flange milled off the exhaust ports

[Tom Broome]

Originally Posted by hrs1326

Can someone enlighten me on these heads? It seems the exhaust ports are re-positioned from stock?? Exhaust flanges shortened???
Using these on a Super Stocker and they are causing some real grief.

I expect what Mike is saying is....Yes, fully prepared (ported/welded/etc.) SuperStock heads, regardless of origin, probably have had the exhaust ports relocated somewhat, and had the flanges cut down for port volume reasons. Without seeing what you're working with, I'd anticipate that exhaust flange adapters, properly matched to the port center-lines are going to be necessary.

[Larry Hill]

If anyone has a set or two to sell I am very interested. Thanks