spreadbore?

[harris66]

whats the diffrence between a spread bore and square bore carb/manifold?

[shoebox]

bolt pattern

and .......

Square bore- The 4 barrel carb's front and rear throttle plates are the same size.

Spread bore- The carb's rear throttle plates are larger diameter (like a GM Quadrajet or Chrysler Thermoquad)

http://www.hotrodders.com/forum/squa...re-102545.html

[harris66]

this is as i thought, thank you for confirming