Square Bore or Spread Bore?
03-04-2004, 09:22 PM
#1
Racer
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Square Bore or Spread Bore?
Which is better? Square Bore or Spread Bore? I have a spread bore intake (original cast iron L48 intake) with a square bore carb with adapter plate. With the adapter and non stock air cleaner I have slight interference with the hood on my 79. I was thinking of getting an Edelbrock RPM intake (square bore) to mate with the carb and remove the adapter plate. Is this combo a better performer than the stock setup with spread bore?
03-04-2004, 09:43 PM
#2
Instructor
Re: Square Bore or Spread Bore? (jacobsed)
I've had a spreadbore Holley 650 on my 1970 350/350 since 1973. It was designed as a Qjet bolt on replacement, I believe. It is a much more responsive carb than the Qjet and did not bog and stumble like the Qjet. I realize this is old technology by today's standards but I just thought I'd put in my two cents worth in anyway.
03-05-2004, 10:23 AM
#3
Le Mans Master
Re: Square Bore or Spread Bore? (70L46Conv4Sp)
I would go fuel injection, but if you must keep the carb I would get a spreadbore for a basically stock or lightly modified car. This will allow some fuel economy benefits. For an all-out bruiser, square bore is probably easier to tune.
03-05-2004, 12:12 PM
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Re: Square Bore or Spread Bore? (jacobsed)
The Edelbrock RPM intake will be higher than your stock intake with the adapter.... won't solve your hood interference problem.
03-05-2004, 12:23 PM
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Le Mans Master
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Re: Square Bore or Spread Bore? (jacobsed)
Keep the square bore carb and get an Edelbrock Performer intake. It's better than the RPM at low rpms anyway...
03-05-2004, 12:24 PM
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Re: Square Bore or Spread Bore? (page62)
Keep the square bore carb and get an Edelbrock Performer intake. It's better than the RPM at low rpms anyway...
