[2bars]

[quote=Gaz64;1437161]Can we get some more info on your engine combo, and what Holley you have, list number etc?

Ok, her goes. it is a 482 (stroked 427) Has the Performer RPM intake and a 1/2 spacer. K&N air cleaner. The engine was dynoed and main jets were changed at that time.

The carb is a a 750 double pumper PN#4779C – Model 4150. For the changes done to it, the list number shouldn't make any difference. Except age and its a 2005.
Primary jet 78, secondary 80 (done by the engine builder)
Front Accelerator pump 50cc with .37 nozzle (done at the engine builder recommendation)
Rear Accelerator pump 30cc with .37 nozzle
it has 11 inches of vacuum at idle. There are two schools of thought on power valve. manifold vacuum divided by 2 or manifold vacuum minus 2. I am installing a 6.5 power valve this weekend. I may also be trying a 5.5.
It has a high volume (250 GPH) fuel pump regulated to 6psi with a return to the tank. All fuel line including the log was increased to 3/8. My builder recommends that the return line be reduced, so return pressure is greater than the 6 psi yet still keeps the fuel circulating.

I am playing with an intermittent surge and having fun dialing it in. If any throttle is applied, it just goes. It did hesitate prior to the 50cc. Surprisingly it has averaged 12 MPG in the first 500 miles... look out Miata.