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Author Topic:   383 Jetting Advice
Dirt Forum Champ
Total posts: 569
posted June 01, 2005 06:01 AM  
Here's the engine - a 12.5:1 383 chevy with cast pistons, 200 cc Dart Iron Eagle heads and a 4150hp mechanical double pumper. I've got timing locked in at 34 degrees and will be turning 6800 rpm max.

What do you engine tuning experts think would be a good starting point for jets? I want to make sure I am not flirting with disaster by leaning this bad boy out.

Also, any advice on tuning (setting float levels, ect) a carburetor to an engine would be greatly appreciated.


Dirt Maniac

Total posts: 116
posted June 01, 2005 06:57 PM  
If you have a power valve, then 85 front 90 rear should be a start. That should be plenty rich.Run it on the track, at the end of the race/hot laps shut it down without going back to idle. Pull off, yank a couple of plugs out and start readin em. Go down two sizes at a time until you reach that light tan color.

[This message has been edited by eenfield (edited June 01, 2005).]

rico 08
Dirt Forum Champ
Total posts: 1139
posted June 02, 2005 08:06 PM  
My 406 has 70's in the front and 80's in the could try 72-82 and go from there.

Dirt Full Roller

Total posts: 58
posted June 04, 2005 08:12 PM  
What type of fuel are you running? If you are running methanol you will need somewhere around 144 on the primary and 154 on the secondary.

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