Trying out a spreadbore carb on the Duster.
Generally speaking, the spreadbore carbs have single holes drilled for mounting them while square bore carbs often have two (so they can be mounted on OE spreadbore manifolds. Holley 4165 carbs (and quadrajets/thermoquads) are a good example of spreadbore carbs.
Generally speaking, the spreadbore carbs have single holes drilled for mounting them while square bore carbs often have two (so they can be mounted on OE spreadbore manifolds. Holley 4165 carbs (and quadrajets/thermoquads) are a good example of spreadbore carbs.