holley 2300 jetting

I recall the stock main jet is a 61-62 on the 350 cfm 2300.
I would back it off to a 58 and see how it runs. If you plan to go up and down the hill I would stay at stock or 1 size smaller.
 
Not sure what you mean by up and down the hill. The lowest elevation it will be at is 4700 ft with trips to 6000-7000 ft
 
The 2300 that was on my travelette had 51's, which were to lean at sea level. For me a set of 52's were perfect. At 4700' I'd start with a set of 50's.
 
rscott said:
not sure what you mean by up and down the hill. The lowest elevation it will be at is 4700 ft with trips to 6000-7000 ft
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Me not knowing the swings in altitude you put the engine through, the statement was just what you posted 4700-7000. For some would be 4700-2000, or up and down the hill.

You'll want to jet for the lowest driving altitude. You'll want to start with the jet changes I recommended. I was going on memory about the starting point so 3-4 down is where I'd be.
 
fdchappie said:
the 2300 that was on my travelette had 51's, which were to lean at sea level. For me a set of 52's were perfect. At 4700' I'd start with a set of 50's.
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I absolutely disagree with 50's, you never base line on the lean side always start on the Rich end of a given range.
 
There are many different variations of the 2300 model carburetor which use different metering blocks which use different size jets. The factory 2300's that came on our beloved IH motors used jets in the low to mid 50's. The 2300 rscott is asking about is a 7448 which come with 61 main jets. IHPA sold him the carb and I set it up(I set all of them up). From my experience with the information I was given(1973 scout2 w/stock 345, 727 auto trans. I live at 4700 ft. I take a couple trips a year hunting between 6000 and 7000 ft. Maybe 2 weeks total.) I felt the jetting right out of the box was perfect. If this had a 304 I would have leaned it out but for a 345 with the higher altitude this should be good. I guess we won't know until rscott installs the carb and tries it out if we know if my jet recommendation was right or wrong. So far of the 50 plus ones that I have done I have had no complaints on the jetting being wrong but there's always a first.
 
Jeff not to argue your input, but the jet size it greatly subject to the venturi diameter. The 350 cfm will run a larger jet. In the case of the 345 it should be a 350.

The high 50 range like 58-57 should be close for his altitude and the larger cfm carb.

My grand theory is to stay on the Rich side in the case of no data supporting leaner jetting. I'm sure you have already done this on the mixer in question.

The racers tell you not to jet by melting or moving metal.

The big calibration changes in metering blocks are in the air emulsion areas. This is in respect to the main jet circuit. The main air metering jets and wells will require small main jet changes. Bigger air corrector size will cover the transition better but will also require small increases in main jet size.
 
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