Dumb question of the day

[72_EB]

What's the difference between spread bore and square bore? Seriously!
Visual aids are always nice. ;D

 

[67EB_in_619]

Dumb Answer of the day:
I would guess that one is spread and the other is squared... (sorry bro.. no real idea for a good answer)

 

[72_EB]

Is spread just an open pletum intake?

 

[mike9624]

If you have a summit or jegs catelog the torker 2 intake is a square and the peformer is a spread.

 

[72_EB]

Cool. Thanks Mike.

 

[cracker]

If you have a Quadrajet carb. and a Motorcraft carb. Look at the base, you can see the diff.

 

[Rustytruck]

The square pattern bottom venturi holes are on equal centers thus making them square. the quadrajet is a spread bore as such two venturis are very large and two are very small so the larger bores have to spread wider than the smaller bores or the base plate and Carberator would have to be huge if it stayed square pattern. This also screws up the bolt pattern making the two types non interchangable.

 

[76Broncofromhell]

Basically, the butterflies on a square bore are all the same size. On a Spread there are small primaries and large secondaries (Quadrajet).