[DAVID GAGNARD]

I started out in 1977 running Holley vac sec. carbs,cause that's what everyone said to run on the street....DP carbs were too "jerky/finicky" for street use according to the experts.......and gave terrible fuel mileage.....
I've used 600's/650's/700's/725's and 750's on small block ford engines, they ran good once tuned to the engine............

Then in the late 90's I was at a buddies shop,helping him work on his 1967 Mystang Fastback,289 engine,he took the Holley 600 DP off and threw it in the garbage can,said it was no good, always ran too rich,he put on one of those shiny Holley 600's vac sec. carbs and pronounced immediately that it ran much better and it might have......

So,when I left, I asked him if I could have the old Holley 600 DP in the garbage can for parts and he said yes. Took it home,left it on a dusty shelf for a year or two, then one cold winter day in the shop I decided to take it apart and check it out, it was fairly clean inside, but I soaked it in carb cleaner overnight anyway, then washed it clean and blew it out....I'm sure it was running way rich on his 289 as it had jets in it about 10 sizes too big for his application!!!!!!!
I re-jetted the carb to what I thought it should be,installed it on my 350hp,351-W, set the floats,set the idle mixture screws and the idle and have not touched it since.......
Without a doubt,it out preforms any of the 4 Holley vac sec carbs I've used on the same engine in the prior 8 years!!!!!! and my gas mileage is no different......
For my street and occasion track driving,I'll take a double pumper carb over a vac sec carb any day.....and that's with 35 years expirence with Holley carbs......

David