Expect to go down on jet size quite a bit as annular boosters have a much stronger signal than down legs . I had a 750 QFT annular booster had it had the same calibration as a down leg out of the box . Was pig rich . Ended up going down 10 jet sizes and one .028 E bleed in the top .
it was on a 408 mopar small block with magnum heads 400ish Hp . Yeah I had a LM2 wide band and it was in the 10’s AF would foul plugs in no time . If it’s a 1.375 Venturi with annulars you have to treat them like a 600 for jetting because a they are corked up with the annular booster. There is a good thread on speed talk forum resolving this issue . That’s how I fixed mine up . As well u should check out the racing fuel systems forums there is a huge amount of carb tuning info on it . All carbs and ignition tuning.
@@nathandean6639Cool, that 360/408 stroker should be a torque monster. Speed talk I'm familiar with and I will check out that Racing Fuel Systems forum as well. I will have some videos on my engine build soon. I had some delays with parts and a problem with rings, so its been slow.
F.Y.I. Using a 50cc pump with 30 cc pump cam will provide the same pump shot as a 30cc pump. No need to put a smaller one on unless it interferes with the intake or something.
Expect to go down on jet size quite a bit as annular boosters have a much stronger signal than down legs . I had a 750 QFT annular booster had it had the same calibration as a down leg out of the box . Was pig rich . Ended up going down 10 jet sizes and one .028 E bleed in the top .
10 sizes thats huge. What was it on? Where you using a air fuel meter?
it was on a 408 mopar small block with magnum heads 400ish Hp . Yeah I had a LM2 wide band and it was in the 10’s AF would foul plugs in no time . If it’s a 1.375 Venturi with annulars you have to treat them like a 600 for jetting because a they are corked up with the annular booster. There is a good thread on speed talk forum resolving this issue . That’s how I fixed mine up . As well u should check out the racing fuel systems forums there is a huge amount of carb tuning info on it . All carbs and ignition tuning.
@@nathandean6639Cool, that 360/408 stroker should be a torque monster. Speed talk I'm familiar with and I will check out that Racing Fuel Systems forum as well. I will have some videos on my engine build soon. I had some delays with parts and a problem with rings, so its been slow.
F.Y.I. Using a 50cc pump with 30 cc pump cam will provide the same pump shot as a 30cc pump. No need to put a smaller one on unless it interferes with the intake or something.
How did you drill for timed vacuum?
If I recall, it was quite easy, just on the main body, and works perfect.
I ran a 650 proform I built out of spare parts it ran smoother then the new 750 I bought for the the car later even after dialing it in.
Carbs that are built from miscellaneous parts are more interesting as well.