Holley .150 titanium needle and seats?
 

Anyone using them? I am ....but seems to be flooding when I'm in rough water. I went to them trying to increase flow on my 1100 hp Procharged motors. I will be switching back this week to the .130 Viton needle and seats. I am running 7lbs idle fuel pressure. I played all over the place w/fuel level.... no change. These are 850 Prosystems carbs. It has been recommended that I try C & S ......but I plan on going to fuel injection this winter. I am using a Fast 02 meter cruising on primaries 12.5. WFO still at 12.5. When I am getting on plane ( at angle) or in rough water blubbers 02 drops in low 11's high 10's?

Are you running a boost referenced fuel psi regulator?

Don't thing they are for use with regular fuels..go back to the regular ones

YES

fixx
 

and rear jet extenions?

Rear Secondary main extensions

I'm running a 950 prosystems carb and have no issues like that...procharged as well...

Back in the day I used to run dual needle & seat bowls at 5 PSI. Much better control & plenty of volume.

EZ,
How much boost? what size engine? What Hp? Do you remember jetting sizes?

Primary?
Secondary?
Power valve size?

Thank you
Randy

HP500 +.030 509, other wise stock, with lightning headers, carb is strait from prosystems 68pri jets, 86 sec 6.5 PV primary only...looking at 7-8 psi boost....carb seems a little rich right now..still tuning..waiting on some more blower pulleys that seem to be lost in shipping !!! M3sc blower