YURVIEW

iTrader: (127)

In the Jet Rating Sticky it recommends robbietherobot.com for sizing and lists Brand recommendations. Here is what is listed in the Sticky for NOS (I am using a Dynotune wet nozzle kit):

NOS jetting 5168 kit wet for LS1 RWHP RATED 900-1000psi rated
single jet plate system
75HP 41N 28F
100HP 51N 31F
125HP 55N 35F
150HP 63N 38F

Here is what Robbietherobot says I should use for each of these shots at 60 psi fuel.

75HP 41N 21F (75.92HP)
100HP 47N 24F (99.76HP)
125HP 52N 27F (122.12HP)

Now even running these thru the calculator at 45psi, came up with different numbers. My main concern is the differences in the FUEL jet sizes. I dont want to leanout. Which chart should I follow???

383vert

iTrader: (4)

That's great. I got on here to ask this very question about jet sizes. i did a custom dry set-up. Thanks.

dlove

iTrader: (23)

Start with the richer one, but don't forget way too rich is bad as well. Hopefully you have a wideband gauge. If so, just do some trial and error.

different jets "flow" different amounts. Every chart you look at is going to be different. It is just to be used as a starting point.

BAKED

iTrader: (14)

Too ricj is worse than too lean. Most of the jet charts that come with the kits are WAY too rich. I'd go with the leaner to start out with. Run it, check your plugs, and I'll bet it's still too fat.