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Charles Stewart · 06-13-2022, 10:18 AM

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

06-13-2022, 10:18 AM	#2
Charles Stewart Member Join Date: Jul 2016 Posts: 389 Likes: 1,655 Liked 753 Times in 213 Posts	Re: Edlebrock 60917 NHRA head 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 Last edited by Charles Stewart; 06-13-2022 at 10:31 AM.