4.8 carb tuning help

[Sweetc10]

At 0 it's 15° at 1000 36° up to 3500 then it ramps down to 32 all the way to 6500. Which way you think I should go for vacuum spring?

[geezer#99]

Originally Posted by Sweetc10

At 0 it's 15° at 1000 36° up to 3500 then it ramps down to 32 all the way to 6500. Which way you think I should go for vacuum spring?

You'll need to translate your timing into 'gearhead english'!
Or give me a link to how you set it.

As for a spring you'll need to experiment. Go stronger first.

[68Stepbed]

Originally Posted by geezer#99

You'll need to translate your timing into 'gearhead english'!
Or give me a link to how you set it.

As for a spring you'll need to experiment. Go stronger first.

The carbed LS engines use a programmable timing box that uses a graph table to set total timing instead of initial and advance settings that adjusted with springs and weights like distributors. That means typical "gearhead English" doesn't apply. lol When I first started learning to set and adjust timing curves on mine, I felt like a....well....you know the old term about a monkey and football.

A little info on it here.--> https://ls1tech.com/forums/carburete...iming-set.html