Okay, so here’s the prologue:

Two years ago I bought a 73 D100 with a 318 in it, only put about 200 miles on it before it was just too much trouble to drive. Left me sitting on the side of the road more than once. Turns out timing was shot, and the torque converter was wrong so it had ripped a bolt out of the transmission mount, which was also bad, and all of the mains were essentially wiped and the crank had 3/16” range of motion forward and backward. It was a project/toy truck so I didn’t care, I decided to rebuild a slant 6 to throw in there and I was just going to do it in whatever spare time I had.

Now for where we are right now, I’ve got a lightly modified slant running a comp cams 241, stock head, kB 8.5:1 pistons, 2bbl intake over hooker headers, hei conversion, and a shiny new Holley 2300 to top all of it off. I’m just wondering if anyone else has run a similar setup before and has already figure out how to jet the 4412 for a slant 6 or if I need to buy a variety pack and spend a day and a tank of fuel to find a good balance for my rig.

Where I’m at with it, I live in Louisiana and it is miserably hot this time of year. Oxygen content per volume of air is slightly lower than moisture content, but we make due. I fought the Carter BBD from the 318, and 2 others that were older spate parts units and couldn’t get it to run right enough to drive because of the throttle plate notches. I got fed up with fighting it and bought a 2300 and adapter and it was a bolt on improvement, though still running rich. The best I’ve managed to do with it is bottom the float out as far as the set screw would let me and even then I can still only choke it back 15-20% before she stalls out when hot or cold. And it runs much better at 5 am when it’s 80F than it does at 5 pm when it’s 93-95F.

So I’m running rich and making pencils out of spark plugs with the #73 jets that come on it. Is there anyone running a 2300 who knows where I’m coming from and can point me to within 10 of the jet size I need?

I have the same carburetor on a basically stock engine with a little bump in compression, headers, Offy intake and HEI. I have 68 jets in mine and it runs good. I am at about 600' above sea level.

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“Buy the ticket, take the ride.”
― Hunter S. Thompson

I’ve been reading some of the more common sizes used on jeeps and chevys of similar displacement and they all seem to like jetting it in the mid 60s. I may pick up 55-60-65 and try to dial it in $8 and a week for shipping at a time.

I don’t suppose this carb is going to be like the qjet on my skylark and not care about atmospherics in the least. But I guess it’s simple enough that retuning it in the fall and spring won’t be that bad.