I am looking for a good book about tuning holley's, for the uninformed, as I don't even know where to start. I am very mechnically inclined, but am carb stupid. I am running a 455 with a mild cam, SP-1, HEI with MSD coil, th400 with 2500-2800 stall and 3.23 gears. I presently have a used holley 650 double pumper with manual choke on it. I have mesed with the acclerator pumps, changed power valves, differnt secondary cams, air fule screws, made sure the choke was off, and I can not make it run right to save my life.....As it goes, it ran best when I put the carb on after I rebuilt it with a genuine holley kit, but as time has past (and I have tinkerd)it has got progressively worse. When I first got the motor running the car pulled like a freight train all the way up to 6000rpm, and still does. The problem lies within the fact that I can not jump on the throttle hard from a dead stop or it back fires through the carb. It will even do this with the car in park reving the motor.It does this less when the out side air temp is above 65 deg. and the engine has to be atleast 180deg+ . If either of these temps is below those numbers it's carb back fire time. The car starts fine, idles fine, and works fine for easy driving, and hard driving if you don't jump on the gas all at once. Basically if you give it all 4 barrles at to low of a rpm it back fires.... What really bugs me is the fact that I know the motor has a ton more power to be had if I could just get this sorted out. Should I just give up and buy a new carb from TA or have some one do a carb for me, or is this some thing I can conqure my self. HELP Carl
A Holley 650 is not NEARLY enough carb to feed even a mild Buick 455. It would not even be enough for a nice Buick 350. For your set-up, a good Q-jet would be the best choice. :TU: But, if you have to have a Holley type---you need at least an 850 cfm unit.
carb problem to answer your question on your carb problem, i had a 455 in my buick century witha holley 750 single pump vacuum secondary dual feed and that carb worked perfect for about 9 yrs with out any adjustments to it. when i took off from a dead stop that carb opened up perfect with 342 gears. car did great donuts. hope that helps yah out. Ray ________ Ship Sale
