old carb/new carb settings

[green67cuda]

ok...got the old carb opened up...the old 600 vac sec has 65 jets (came with 64) and a 65 PV...the secondary plate is a 39, which is like 70 jets, the black secondary spring, and .031 squirter.

the new 770 cfm came with 72 primary and 75 secondary jets, a 65 power valve, the silver spring installed, and a .025 squirter.

i know the best results will come with tuning, but are there any obvious changes that need to be made to the new carb, considering the settings of the old one?

 

[dgc333]

The secondary spring is an easy one to figure out. If you have a kick in the pants feel when the secondaries open then the spring is to soft. There should not be any noticable transition to the secondaries. If you don't have a kick now keep going softr to you do then go back one.