1966 Valiant Sedan V8 Swap (Victoria)
So, take a straight edge and lay the edge on the face of the drum in the rear! Now measure from the edge that is on the drum to the leaf spring, and also from that face to the wheel lip edge! Let's say that it is 4" from the spring and 6" from the wheel lip edge! You would like a little clearance on each side so subtract 3/4" inch from the 4" measurement and you get 3 1/4" of backspace! Next you subtract about 1" of clearance from the drum edge to the wheel lip, 5"!! Using these numbers you could run an 8" rim with 3 1/4" backspace!! These are just imaginary numbers, but you get the pic!!
On my pictured example, this is the 66 Valiant, the distance between the spring and the drum face is 5 3/4" and between the drum face and the wheel lip is 5 1/2"! I am inclined to go with an inch on each side, so I can safely run 4 1/2" backspace and 4 1/2" from the drum to the lip! That equals 9" but I would err on the safe side and go with an 8" rim with 4" backspace!
So, take a straight edge and lay the edge on the face of the drum in the rear! Now measure from the edge that is on the drum to the leaf spring, and also from that face to the wheel lip edge! Let's say that it is 4" from the spring and 6" from the wheel lip edge! You would like a little clearance on each side so subtract 3/4" inch from the 4" measurement and you get 3 1/4" of backspace! Next you subtract about 1" of clearance from the drum edge to the wheel lip, 5"!! Using these numbers you could run an 8" rim with 3 1/4" backspace!! These are just imaginary numbers, but you get the pic!!
On my pictured example, this is the 66 Valiant, the distance between the spring and the drum face is 5 3/4" and between the drum face and the wheel lip is 5 1/2"! I am inclined to go with an inch on each side, so I can safely run 4 1/2" backspace and 4 1/2" from the drum to the lip! That equals 9" but I would err on the safe side and go with an 8" rim with 4" backspace!