hello everyone i recently put a 5.0 in my mustang and noticed that my 4bbl isnt kicking in...when hit the throttle under the hood with the car off i can see fuel shooting into the front but not the back barrels...whats wrong with this? its a brand new holley 600 #1850...thanks
tyler

 

Try it with the engine running. You will be amazed at what you find!!!

 

1850 is a vacuum secondary carb i believe, the secondaries will only open when its running. If they feel like there not coming open ,when driving it, you can change the spring that controls the secondaries. Go to holleys website for instructions on tuning the carb, there is lots of good info there.

 

well that's also because it's not a double pumper meaning there is only an accelerator pump on the primary circuit and unless there is a vaccum drop the secondaries will not open because it's a vaccum secondary carb. If I were you I'd study a little bit or google the theroy and operation of the different types of carbs......cause you have vacccum secondary carbs, weighted secondary carbs, mechanical secondary carbs, single accelerator pump carbs, double pumpers ect ect......... if you have a problem ...what is it and what are you trying to solve????? have you taken the car out on the road to see if the secondaries kick in??

 

well i acutally just rebuilt the engine and put new rod bearings and stuff in it so i wanted to break it in b4 i get on it hard....i thought it might be because it is a vacuum carb but i just wasnt sure...thanks everyone...o yea and does anyone know where i should set the mixture at? i have an edelbrock torker intake stock heads with the exhaust bumps removed longtube headers and an off road x pipe...thanks
tyler