Tri Power Probelms

[Carl Johnson]

I have a tri power set up from a 350 Hp HO 348, that I have installed on a stock 348 with Hydraulic lifters The probelm is that the jets have been bored out and it runs way to rich for the stock engine.
Can anyone tell me the correct jet sizes for a 280 HP 348 or where do I look to find that info?
Thanks CJ.

 

[Fathead Racing]

I have a tri power set up from a 350 Hp HO 348, that I have installed on a stock 348 with Hydraulic lifters The probelm is that the jets have been bored out and it runs way to rich for the stock engine.
Can anyone tell me the correct jet sizes for a 280 HP 348 or where do I look to find that info?
Thanks CJ.

Correct sizes are different front to back and different from stick to auto trannys. Simple way is to jet front to back with .061 jets. I and many others have jetted this way with more than satisfactory results.

 

[dac62]

Ebay seller 3574gary has jets of all sizes.

 

[Stovebolt V8]

Just happen to have the answer from the Rochester records.
Front carb is 7013015 with jets 7002960 for automatic and 7008663 for standard trans
Center carb 7013020 for standard trans, 7013016 for auto trans, and 7013026 with AC all used 7002660 jets
Rear carb 7013017 with jets 7002960 for auto trans and 7008662 for manual.

All 7002 jets are from Group "B" with 60 deg approch
All 7008 jets are from Group "C" with larger 60 deg approch

The last 2 numbers of the jet size is the number stamped on them and "GENERALLY" are the decimal size.

Hope this helps.