[Jmar]

Scott,

Thanks for the info. I'm sure mine has a progressive rate link. I have been slowly tweaking my carb and have received mixed advice that my carb is too big for my application (750 dp), or that it's just right. I have a cam with 230I 220E @ .050, trick flow 23 degree heads, 3.55 gears, RPM manifold, street rod headers and a 2800 stall convertor. According to the holley book this looks like a good match for a 750.

When I took it to a chassis dyno shop, I ran it with a broad band O2 sensor and was told to lean it out for more power. The dyno operator was able to gain 10 hp by simply leaning out the idle circuit. So I ultimately reduced the main jets by 4 numbers in front and back. This created a part throttle (cruise) stumble and I was able to reduce this by having the power valve open at a higher manifold. It still has a small hesitiation at around 2500-2700 RPM when I open all barrels. I think it is when the back 2 start to open. Should I look into a slower opening rate for the secondaries, play with the power valve a little more or just get a smaller carb?

Thanks

Jeff