re-jetting

[SFC Mike]

I'm looking to rejet the carb on my '68 318. All I know about it is that its a 2bbl and made by Carter. It has markings on the side near the Carter name, "O-2299", and on a small tag "46088 3218". I need some help finding out what I need to do the job. The car came from about 2000ft elevation and I live at 8500.

[dwc43]

I'd get a 2bbl from a local junk yard and a kit from the parts store and go at it. The Cart carbs use a 3 number jet where holley uses a 2 number jet.

[Rug_Trucker]

There is no number cast on a Carter BBD that you can use to ID it. The tag has the ID.

How does it run now? I have a big stack of 3 types of BBD's. It is really hard to read the jet numbers!

More than likely you just need to change metering rods.

[DonCarr]

Get a Gtechpro RR accelerometer. Suction it to the windshield.

Rip down the road and check the HP/TQ numbers.

Try a bigger jet, repeat test.

Compare output chart.

If HP/TQ improved go to a bigger jet.

If not go to a smaller jet.

I think idea is to use one step richer jet than max HP numbers.

Can also look for lean/rich conditions at various rpm by comparing charts.

Not sure if a jet kit is available for that carb. Would have to drill and tap for holley or Carter jets with available assortment.

Or solder holes and redrill each time with letter/number drills and flow test each pair of jets that they are the same. (just time some amount of liquid running through each jet)

Could get broad band oxygen sensor installed in exhaust too.

[Crank]

you don't need more fuel you need more air

[Paul Precht]

Drill the main jets to .070". They are 63 to 67 now. You'll love the increase in power but gas mileage will suffer a little, Paul.

[fox]

It should need LESS fuel at altitudes higher than it was tuned at.
Try a precision drill set, find the size they are now and tune fron there. ( yes I know jets have different entrys nad exits, that effect the flow)