Can anyone tell me what setup they use in their Holley 700DP (4150)carb? I am having a lot of trouble getting this carb to work on my car and I could use any help I can get. I have a 351C with 4V quench heads, Blue thunder manifold, Lunati cam #00093LK, 11.0:1 compression, and a steady 6.5psi of fuel pressure. This carb runs extremely rich (~13.3:1)during steady low load cruising even though I jetted down from the original 69 primary jet to a 64 and it made little difference. Also I have a huge lean hole when I wing the throttle open at low to mid RPM’s. This lean hole is worse if I only go half way to the floor (staying on the primarys), but is still very bad when I go all the way down as well. For this issue, I have gone all the way up to # 40 squirters (original was 28 pri and 31 secondary) with the large pink pump cams and it still goes off the A/F meter scale lean for .5 seconds and then takes off at anything under 4K rpms. Two things to note here are, first I have a Holley 600DP which has no drivability issues at all (put it back on car as a test and it still runs great, just less overall power then the 700DP). Second note is that this is my second new 700DP and it has the same issues as the first. What am I doing wrong here? Is there some air bleed changes that need to be made? Is this carb just way to big for my application?
Original Post