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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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?

Re: Square bore?
 

Really not for sure. Stock I believe at this point
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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

Re: Square bore?
 

Ok. Thank you
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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:lol:

Re: Square bore?
 

This is what you would need.

http://www.summitracing.com/parts/mrg-1932/media/images

Re: Square bore?
 

Thanks!
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Re: Square bore?
 

most adapters do go either way, from square to spread and vice versa. check Summit for adaptors