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Old 11-19-2010, 06:35 AM
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What size Jets for 383 Stroker

I am running a holley 4160 on a 383 stroker. Running a com cam 280H, Edel air gap intake, Vortec heads, Keith Black flat top .030 pistons, Summit 80 gph mech pump. It seems when the truck fires its running out of fuel. The carb is running 65 primaries. These seem small to me?
I was thinking about changing out for 70?

Can you tell me what size jets you are running ?

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Old 11-19-2010, 07:07 AM
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I would think that no matter what size jets its got it should idle, fires and dies? You have another problem at hand. Jet sizes comes into play under power .
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Old 11-19-2010, 08:36 AM
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It starts but when you bring the motor up to 2000 to break the cam in it will shut down. So it runs for a few seconds at 2K then just dies.
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Old 11-19-2010, 08:41 AM
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What size carb?? 4160 is a model number, not a list number. 4160 models come in numerous sizes.

Just because a carb is on a built or bigger engine doesn't mean it automatically needs bigger jets. A bigger engine will often need smaller jets, because it "pulls" harder on the airflow thus pulling more fuel through the jet.

No set rule of thumb, that is why tuning often means testing to see what works best.
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Old 11-19-2010, 08:44 AM
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Quote:
Originally Posted by remist17
It starts but when you bring the motor up to 2000 to break the cam in it will shut down. So it runs for a few seconds at 2K then just dies.
Main jetting is not even in play at that rpm, it is running on the idle and transition circuit at that time. Something is out of whack other than the jets. Could be some passage in carb is plugged, or a fuel delivery problem, needle and seat problem, float height problem...
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Old 11-19-2010, 09:35 AM
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Like Eric said check the float levelsand make sure the needle and seat are adjusted properly and functining. Also make sure you have the correct fuel pressure coming into the Carb.
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Old 11-19-2010, 01:50 PM
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Carb is a Holley 4160 street advenger.

The pressure is around 6 to 7 psi coming into the carb. The gauge is on the carb line. I am running 3/8 tube from the tank to a 3/8" inline filter to a summit 80gph mechanical fuel pump. Out of the pump I am running hard tube to the carb line.

what would I look for to see if the carb is set right in the float as discribed below. I am stupid when it comes to this. My father in law is pretty good with them and I will print this thread out for him to look at.
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Old 11-19-2010, 03:12 PM
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Quote:
Originally Posted by remist17
what would I look for to see if the carb is set right in the float as discribed below. I am stupid when it comes to this. My father in law is pretty good with them and I will print this thread out for him to look at.
here you go.

http://www.youtube.com/watch?v=ge-mIk6nEYQ
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Old 11-19-2010, 06:34 PM
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The jets would give you a backfire or bog mostly but really a totally dead spot. I have 73 jets on my 383 which the carb came factory with 72. Im not saying mine are ideal, or correct, but yours dont sound too far off

That video link is about all you need to set the general level. Some guys go a tad higher depending on the setup

Have you monitored the fuel pressure at that rpm? How about the secondaries? Are they working at all? It sorta sounds like you're running out of fuel because the secondaries arent kicking in. Or is this also happening in neutral?
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Old 11-22-2010, 06:53 AM
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Well the truck stops running after about 30 seconds. I have never moved the truck so its in park when it dies. I have monitored the pressure gauge and it never drops below 6psi at 2000 rpm. I dont think the seconadires ever kicked in yet. I am still trying to break in the cam.

I have not pulled the secondary bowl off so I am not sure what size jets they are. but the primaries are 65. Are these to small? I would figure they would at least idle.
Is my pump to small? I am running a mechanical 80 gph summit pump.
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Old 11-22-2010, 08:44 AM
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Quote:
Originally Posted by remist17
I am still trying to break in the cam.
I would borrow a known working carb from someone before you ruin the cam.
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Old 11-22-2010, 09:54 AM
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just picked up a carb from a friend that it was running. Will try that.
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Old 11-22-2010, 01:16 PM
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I agree use a known good carb.

The secondaries are not functional in park so their size has no effect

80gph pump should be good enoug
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