Factory Holley carb?

FC Zach · 02-09-2012, 10:02 PM

I'm going to say no and that's based off my own personal experience. I didn't want to buy their fancy glorified Holley so I used a regular 600cfm with vacuum secondaries. The engine wouldn't create the vacuum needed to open the secondaries and that fuel circuit wouldn't work even if you manually opened the secondaries. I called RB for help and because their fancy overpriced glorified Holley is specially built and proprietary, they will not give any information on it. All I got from them is that the base plate is completely different, some ports are opened, and some ports are closed? The jets are also smaller in the RB version as compared to what typically comes in an off-the-shelf Holley.

mattallac · 02-09-2012, 10:21 PM

yes you can for a stock 12a its a 465 cfm you put a threaded hose nipple in the primary float bowl side where the sight hole is for setting the float bowl level ,you will also need to make a bracket for the throttle cable and then make an arm and rod for the oil metering block .I have owned quite a few holleys and the only thing you need to find out is the jet sizes. Usually the RB holleys are set up a little lean on the secondary side(at sea level) and if its a vac secondary then the spring can be changed to open with less vac signal. RB can tell you what carb to use for motor size and port .If it was my car then a weber would be my pic. Better fuel delivery and no hesitation around sharp corners ,even with center hung bowels there is still a hesitation with the holley . Good luck.

02-09-2012, 10:02 PM	#1
FC Zach RCC Loves Me Not You Join Date: Mar 2008 Location: Eagleville, TN Posts: 2,267 Rep Power: 20	I'm going to say no and that's based off my own personal experience. I didn't want to buy their fancy glorified Holley so I used a regular 600cfm with vacuum secondaries. The engine wouldn't create the vacuum needed to open the secondaries and that fuel circuit wouldn't work even if you manually opened the secondaries. I called RB for help and because their fancy overpriced glorified Holley is specially built and proprietary, they will not give any information on it. All I got from them is that the base plate is completely different, some ports are opened, and some ports are closed? The jets are also smaller in the RB version as compared to what typically comes in an off-the-shelf Holley. __________________ 1993 Yamaha GTS1000 1992 Celica Turbo AllTrac 1987 RX7 Sport 1979 Yamaha G1, KM24 powered 1975 Dolmar KMS4

02-09-2012, 10:21 PM	#2
mattallac Rotary Fanatic Join Date: Aug 2011 Location: crockett ca. Posts: 176 Rep Power: 0	yes you can for a stock 12a its a 465 cfm you put a threaded hose nipple in the primary float bowl side where the sight hole is for setting the float bowl level ,you will also need to make a bracket for the throttle cable and then make an arm and rod for the oil metering block .I have owned quite a few holleys and the only thing you need to find out is the jet sizes. Usually the RB holleys are set up a little lean on the secondary side(at sea level) and if its a vac secondary then the spring can be changed to open with less vac signal. RB can tell you what carb to use for motor size and port .If it was my car then a weber would be my pic. Better fuel delivery and no hesitation around sharp corners ,even with center hung bowels there is still a hesitation with the holley . Good luck.