Can someone help on power piston 7041250 Olds

[Mr.Pontiac]

I had it here on my bench but got thrown in with other parts from carbs. So what does it look like and proper metering rods should be what size???

[Cliff Ruggles]

It is a short spring and not a lot of coils.  If you have one of our spring kits it is the orange spring from the kit.  I don't have a listing for what jets and rods went into that carb number but I usually free up the APT system when I build those and install jets and metering rods matched for the application......Cliff

[Mr.Pontiac]

Cliff, yes sir, i have the orange spring with your kit, super so far i just do not know what the power piston itself looks like??? Pin style for APT or with a hole up thru???

[73ss]

704 casting should be the pin style, With the apt adjustment in the baseplate. If the adjustment is through the air horn, it should be the pin-less style.

[Cliff Ruggles]

Correct, the 7041250 uses the early APT system with a "post" on the bottom of the power piston and adjustment is made with the screw in the baseplate located under a cover between the mixture screws.

It will be loctited in place and often difficult to remove.  We make an external APT screw for those with a spring on it so it will hold it's adjustments if  you are trying to use it like a later model APT unit......Cliff

[Mr.Pontiac]

Thank You very much!!