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05-05-2013, 11:38 PM
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#1 |
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Registered User
Join Date: Jan 2013
Location: New providence ia
Posts: 1,018
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Square bore?
New to engines for the most part. Getting an edelbrock 1407 carb. Says square bore well what does this mean and what do I need to do. Thanks
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72 GMC super custom. 
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05-05-2013, 11:43 PM
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#2 |
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Registered User
Join Date: Apr 2013
Location: Flower Mound TX
Posts: 173
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Re: Square bore?
Means all of the holes on the bottom of the carb are the same same size. Some have two larger and two smaller holes. What are you converting from? What intake manifold do you have?
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05-05-2013, 11:45 PM
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#3 |
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Registered User
Join Date: Jan 2013
Location: New providence ia
Posts: 1,018
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Re: Square bore?
Really not for sure. Stock I believe at this point
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72 GMC super custom.
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05-05-2013, 11:55 PM
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#4 |
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Registered User
Join Date: Apr 2013
Location: Flower Mound TX
Posts: 173
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Re: Square bore?
May need others to chime in here, Quarajet to four barrel conversion. Looks like you may need an adapter if you are going to keep the stock manifold.
Part number 2696 from Edelbrock's webiste Four-hole, Square-bore to Spread-bore Adapter (.850") Mounts Edelbrock square-bore carbs to stock Quadrajet & Thermo-Quad manifolds. 2696 |
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05-06-2013, 12:02 AM
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#5 |
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Registered User
Join Date: Jan 2013
Location: New providence ia
Posts: 1,018
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Re: Square bore?
Ok. Thank you
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72 GMC super custom.
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05-06-2013, 12:38 AM
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#6 |
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Registered User
Join Date: Apr 2011
Location: Mustang, Oklahoma
Posts: 2,806
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Re: Square bore?
A factory intake should be a spread bore. Easiest way to explain is the spread bore has large "butterflies" on the secondaries errr its bigger at the rear where a square bore is symmetrical or equally square. Harder to explain than I thought. Perhaps a pic will do much better.
Pic 1 square bore Pic 2 spread bore There is an adapter but it only goes one way and I forget which way it adapts at the moment.. getting old sucks 
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Dan <---(my name) 67 SWB C10 project "GEORGIA"-59 Brookwood 2dr wag...Next project-03 Tahoe 4x4 5.3 family ride-07 Hondur Accord, commuter car |
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05-06-2013, 09:38 AM
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#7 |
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Registered User
 
Join Date: Dec 2012
Location: S/W Missouri
Posts: 121
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Re: Square bore?
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1972 C10 CST LWB |
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05-06-2013, 09:39 AM
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#8 |
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Registered User
Join Date: Jan 2013
Location: New providence ia
Posts: 1,018
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Re: Square bore?
Thanks!
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72 GMC super custom.
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05-06-2013, 12:20 PM
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#9 |
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Proprietor of Dale's Corner
Join Date: Nov 2012
Location: Vacaville , CA
Posts: 16,245
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Re: Square bore?
most adapters do go either way, from square to spread and vice versa. check Summit for adaptors
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"Some Days Chickens And Some Days Feathers" Dale XNGH ECV Sam Brannan 1004 R.I.P. 67ChevyRedneck R.I.P. Grumpy Old Man R.I.P. FleetsidePaul |
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