by GregR » 14 Fri Mar, 2014 11:51 am
You likely have 1 1/2" exhaust. 1 5/8" are normally used on bigger displacement engines (anything over 2000cc)
1 5/8 pipes can actually rob a smaller or stock displacement engine of power.
You say you have a 1965 engine. Stock that could be 1200 or 1300 cc's.
Unless your grandad can tell you of any mods he made to the engine; the only way to know for sure what you have is to tear it down.
The fact that it has duals may mean you are slightly larger than stock; maybe 1641 or 1776 again, only one way to be sure. What dual carbs do you have?
Before you do anything regarding carbs, etc., go to the Nac show next weekend, look around, talk to the gang and then make some decisions.
GregR