six pack surging back and forth at freeway speeds?

[mauve66]

if you can "feel" the outer carbs come in then they are coming in too late, the transition should be seamless

[maxwellwedge]

they make different springs for secondaries.i run what my car came with from factory. around 65 mph running a 4:10 rear i notice the six bbl starting to kick in.change your springs. this has nothing to do with fuel line size.

I have a few six-pack 4.10 cars - 4-Speed and Auto. If your end carbs are starting to come in at 65 MPH your springs are way lighter than the stockers....or you are really running 4.88's   

[Sublime/Sixpack]

 

[jerry]

white springs 30" tall tires 65 mph = lift off.

[70charginglizard]

sounds like a vaccum advance problem to me.try unhooking the vaccum advance hose and plugging it. then go out and drive it and see if it still does it. thats why i dont run a vaccum advance on any of my cars.

Disconnect it and go for a spin to see what happens.  

If the brake booster has a vacuum leak that can also be an issue as well.  



Ron

I think that was may have been it Ron. I pulled the vacuum line like you said and ran it down to snohomish for a spin today and with the vac advanced unplugged it seemed to eleviate the surging. and when I plugged it back in and ran it home I started noticing it again.

Wonder why it didn't do it before the six pack conversion? It's the same distributed.