Re: holley jet size 35?
[Re: viperblue72]
#1697537
11/18/14 10:36 AM
11/18/14 10:36 AM
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Pretty sure a #53 or a #56 jet is too fat. My 72 225 ran a #50 stock.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: holley jet size 35?
[Re: viperblue72]
#1697539
11/18/14 02:56 PM
11/18/14 02:56 PM
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Joined: Jan 2003
Posts: 9,436 Blair County,PA
62maxwgn
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Quote:
I can't update mpg yet. But with these changes my top speed went from 78mph to 85mph. I'll update mpg soon. I also installed a #56 jet. It appears smaller than what was in it.
Out of curiosity what what is the actual carb number ?
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Re: holley jet size 35?
[Re: 62maxwgn]
#1697540
11/18/14 04:30 PM
11/18/14 04:30 PM
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Joined: Aug 2006
Posts: 2,141 junction city oregon
viperblue72
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Quote:
Quote:
I can't update mpg yet. But with these changes my top speed went from 78mph to 85mph. I'll update mpg soon. I also installed a #56 jet. It appears smaller than what was in it.
Out of curiosity what what is the actual carb number ?
I don't have the carb number now, but I did look the numbers up and it was out of a '68 dodge pickup. I have not been able to find anywhere stock jet sizes were listed. I got the #56 from a guy on the net, so it's not necessarily right.
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Re: holley jet size 35?
[Re: dogdays]
#1697541
11/18/14 04:32 PM
11/18/14 04:32 PM
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Posts: 2,141 junction city oregon
viperblue72
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Just from looking at the picture I can tell you your old jet was at least a 72.
You may be able to go smaller one or two jet sizes from stock, maybe more depending on your altitude. I'd start reducing jet size until you get lean surging at cruise, then go up one number. Holley says you have to make a two number switch to have a noticeable change, but on such a small carb I'd go one step increments.
I have bought jets on the 'bay but I have found a local place that'll sell me a pair of jets for $4.00. Some are new, some used...but unless some donkey messed with the holes, they work.
Another area where one can make the engine work better is ignition advance curve. Unless you have a problem with detonation, bringing it in faster will add some snap to the engine's performance.
R.
With the new distributor, I did have to back the timing off just a bit due to detonation. Now that the vacuum advance is working.
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Re: holley jet size 35?
[Re: viperblue72]
#1697543
11/18/14 05:01 PM
11/18/14 05:01 PM
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My suggested #50 jet was based on the 72 Dodge FSM's listing for a 72 Swinger with a 225, which is what I had. That carb had a #56 in it and got horrible mileage.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: holley jet size 35?
[Re: 62maxwgn]
#1697546
11/18/14 07:26 PM
11/18/14 07:26 PM
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viperblue72
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Bill, Thank you for looking that up for me. I will probably downsize my jetting to stock, and go down a size or two from there if possible. Fwiw it was listed as a '68 automatic pickup. Is there anywhere I can find this kind of information on the internet?
Last edited by viperblue72; 11/18/14 07:28 PM.
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Re: holley jet size 35?
[Re: 62maxwgn]
#1697547
11/18/14 07:29 PM
11/18/14 07:29 PM
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There you go, better data.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: holley jet size 35?
[Re: viperblue72]
#1697549
11/18/14 08:50 PM
11/18/14 08:50 PM
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Hey, no sweat, I didn't know the specs for a 68 truck and I couldn't find anything on the net, so I gave you the specs I had as a starting point. As long as it works out in the end that's all that matters. My Swinger was a CA emissions car so who knows how that might affect it.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: holley jet size 35?
[Re: Supercuda]
#1697550
11/18/14 10:31 PM
11/18/14 10:31 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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Viper that ain't a long winded post! I went & checked my Holley jet box & was surprised that they start at 64 from the numbers in this thread that are way lower
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Re: holley jet size 35?
[Re: RapidRobert]
#1697551
11/18/14 11:14 PM
11/18/14 11:14 PM
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Joined: Jan 2003
Posts: 9,436 Blair County,PA
62maxwgn
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Quote:
Viper that ain't a long winded post! I went & checked my Holley jet box & was surprised that they start at 64 from the numbers in this thread that are way lower
That's because that box is the performance jetting,not applicable to one and two barrel carbs.You'll find those jets all have the number stamped on the side.
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Re: holley jet size 35?
[Re: RapidRobert]
#1697553
11/19/14 12:37 AM
11/19/14 12:37 AM
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Posts: 2,141 junction city oregon
viperblue72
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Quote:
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That's because that box is the performance jetting,not applicable to one and two barrel carbs.
Oh Ok that makes sense
Yeah, but thanks for sharing, as I was just looking at prices for those assortment kits earlier and considering one. I have to order jets online as the local parts stores aren't carrying holley jets like they used to.
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