[Chris_oz]

Hi again,

I have a high quality rebuild kit, new float, powervalve retaining clip, power valve springs all on the way over.

I looked at the primary needles again last night, they are very worn, the power tip which should be 0.026 is 0.023 at its thickest and is tapered.
The low speed section that should be 0.039 is under 0.036 in places.

I would like to replace them. Which leads to my question.
What is the stock primary jetting (& needles) for my truck.
1970 C20, 350 4 speed manual?

I have several charts which have it listed as anywhere from
0.068 jets and 0.043/0.026 needles up to
0.076 jets and 0.039/0.026 needles.

I currently have 0.075 and 0.039/0.026

If someone can show me a chart, or a link to a chart which is correct, or someone who has jetted their truck give me a starting point.
I know it all changes now we have unleaded fuels.

Thanks for the replys