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Old 04-11-2014, 12:42 PM   #1
MAURICE BLENDHEIM
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Default Re: New Aluminum Cylinder Heads for the 396

The Edelbrock 60547 has a 315 runner and is the same as the GMPP "401" head both being Rectangle Port and Legal. The Edelbrock 60447 has a 290 Oval Port runner, but is listed from suppliers (Summit & Jegs) as NHRA Legal and is described as having 2.19 - 1.88 valve seats. Obviously there is more to this, than I would be ready to assume. Could make quite a difference on a 325-350-360HP combination if its reality. MB.
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Old 04-11-2014, 12:48 PM   #2
Bobby Lundholm
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Default Re: New Aluminum Cylinder Heads for the 396

Isn't this for Super Stock only though?
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Old 04-11-2014, 01:33 PM   #3
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Default Re: New Aluminum Cylinder Heads for the 396

per Edelbrock's website, the rectangle port is legal stock and ss, the oval port is super stock only.
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Old 04-11-2014, 02:06 PM   #4
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Default Re: New Aluminum Cylinder Heads for the 396

60447 is for the 396/325/350 HP combo's for SS only. Too bad thought I was getting some aluminum heads.
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Old 03-02-2015, 10:21 PM   #5
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Default Re: New Aluminum Cylinder Heads for the 396

The 60547 heads on summitracing.com says the spark plug hole is moved closer to the combustion chamber by .150 and the NHRA rule book says it has to be in the same location. Not sure how it's an accepted product
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Old 03-03-2015, 07:10 AM   #6
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Default Re: New Aluminum Cylinder Heads for the 396

Quote:
Originally Posted by SantinoBlanco View Post
The 60547 heads on summitracing.com says the spark plug hole is moved closer to the combustion chamber by .150 and the NHRA rule book says it has to be in the same location. Not sure how it's an accepted product
By adding 10 HP
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Old 03-07-2022, 07:19 PM   #7
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Default Re: New Aluminum Cylinder Heads for the 396

Quote:
Originally Posted by MAURICE BLENDHEIM View Post
The Edelbrock 60547 has a 315 runner and is the same as the GMPP "401" head both being Rectangle Port and Legal. The Edelbrock 60447 has a 290 Oval Port runner, but is listed from suppliers (Summit & Jegs) as NHRA Legal and is described as having 2.19 - 1.88 valve seats. Obviously there is more to this, than I would be ready to assume. Could make quite a difference on a 325-350-360HP combination if its reality. MB.
You got me on that Terry, but the argument is the same.
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