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Discussion Starter · #1 ·
I was told it was spreadbore but it kinda looks like a squarebore. Then again it looks a bit different then my square bore on my 56...
 

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its a square bore

Even though the secondairy throttle plates are larger than the primary that is still a square bore carb. Spread bores like the Rochester Qjet Carter thermoquad or the holley spread bore have very small primary and very large secondairy throttle plates. Randall
 

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picture

The picture you posted is a squarebore. Spreadbore carbs have 2 small primary bores and 2 large (2.25 in) secondarys.
 
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