carb. jetting?

[Myron Piatek]

4776-3 & newer versions come with 66 primary and 73 secondary jets. You can usually jet square if you eliminate the power valve. But to make sure you compensate correctly, you should measure the power valve channel restriction. Somewhere there is a list or formula showing how much difference in jetting there is based on the size of the 2 holes under the PV. It can vary between carbs.


Distribution can be tricky, but I did find a different need between the shallow side and deep side of an aftermarket dual plane intake I tried once. But different manifolds can have different distribution issues, or compensation built-in.