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Just found this hope it helps others….

Guys how does Edlebrock measure Intake Manifold height? I am working some clearance issues myself on a SBM 340 and I need to take some measurements and I need to compare to Edlebrock units but know how they actually reference/measure their units.

Got it I must have missed you indicating that my set up is correct and exactly like yours as is. I see that the high speed idle linkage is actuated in the counter clockwise direction(of course with the cam). Not sure what that spring does but it for sure is not meant to hold engagement of the...

Well the spring on mine keeps the arm away from the cam as opposed to keeping it engaged as it should so thats the first thing that I need to change/figure out. The screw might be fine. I just need to fiddle with the assembly and figure it out. I was able to locate an exploded view of the 4150...

Thanks........ no high speed idle spring action at all as the spring tension is pushing the idle linkage away from the cam ie counterclockwise tension. The high speed idle linkage never engages or touches the cam. I did try to loosen the linkage to take it off and look at the spring but its...

Thanks for helping me with this......so this means that the spring should push the lever clockwise against the cam. This is not how mine was set up and must be the problem. You don’t by any chance have a picture of how that spring is set up in there do you?

Thanks for sticking with me on this. Choke works! Cam moves correctly. The screw never makes contact with cam. Spring tension is counter clockwise pushing the high speed idle counterclockwise. I think this is the issue whoever assembled it must have put it in backwards? When you say pulling down...

The pin is above as I indicated and the choke works. However the fast idle linkage never engages and the tension appears to be in the wrong direction (tension down and towards the driver).

Here we go

My spring tension seems to be be in the direction of pushing the high speed idle adjuster towards the back of the car. This looks to be in the same direction as the cam would want to push it as the choke in engaged. Seems backwards to me as I originally indicated. So the choke cam never engages...

Thanks RTboy now we are getting somewhere did you take off the cam just for this pic? If so can you take a pic with the cam installed showing the cam and fast idle lever engaged cold at rest choke off? That would be equivalent to the pic I took above to compare. Thanks again!!

Thanks I will check asap.

Thanks Ron I believe what I have is the smooth cam fast idle set up but it does not engage when I pull the choke out. So I am trying to figure out why. Can you confirm that what I have in the pictures I took is complete and set up correctly? To me the fast idle cam is *** backwards as the spring...

Ok I think I actually have the circuit but don’t see how it works as set up on my carb. The spring looks like its in the wrong direction possibly? As the spring is holding the can back not forward. And the choke appears to push the cam back. So when off choke or on there is no change to the cam...

Thats the problem I don’t know what I need other than the cam. I don’t have an assembly drawing or any reference. When I got the carb it was already removed. Do you have any pictures or drawings showing what tbe assembly includes?

Thanks Rob. Do you know were I can find an exploded view of the assembly? Washers clips etc. The manual does not show it that I can find.

Maybe a more general question but here it goes: Does the Holley 4150 (with a manual choke) operate a high speed idle cam or is that cam only for the bimetallic electric choke set up?