Hey guys, I bought a custom carb a while back and would like some help with a baseline. I tried to call the shop but never got a response.
I believe it's an 850
It has billet baseplate, metering blocks and HP main body.
1.75 throttle blades
1 9/16 venturi
Annular boosters
74/76 main jets
35/31 squires
HSAB 30/30
IAB 62/62
4.5 PV'S
50CC acc pumps front and rear.
The throttle shafts are thinned. It worked well on my 385 but I'd like to use it on my 439.
Thanks

When I got done jetting my 830hp I am at 84 front with P/V and 92 rear no power valve. The 1000hp I had was well into the 90's jet wise with P/V's that 1000 was super lean out of the box. Are you racing with this 850 or running this on the street?

 

Street. Straub squishy roller 439 239/247@.050 108 LSA
I'm changing the Weiand single plane out for a Performer RPM.
I'll also be putting 30cc pumps on it.
I was thinking 8.5 power valves to start. Idle vacuum is 13", not sure what it pulls at cruise yet.
Do annular boosters effect main jet sizing?
I've got a LM2 AFR gauge to help me.

 

Who is the carb from, and do you know what size IFR it has?
Also what is the emulsion stack set up?

 

Custom Race Carbs.
I'll have to check on the other