manifold question

[margo]

I have a edelbrock performer rpm. man. How can i tell if it,s a spreadbore or squarebore also what carbs fit or do you order them accordingly...Thanks

[maddad]

margo, on a spreadbore carb or manifold, the primary side(under the choke/towards the front)bores are smaller than the secondary. With a square bore, they are equal size.