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Unread 07-26-2009, 01:01 PM   #31
samtye
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anyone swap out for a 4 barrel, im tired of messing with this holley. after it sits for awhile(more than a week or so) it runs rich. i have a edelbrock 500 i was gonna jet down but im not sure how they work on the 258. any help or suggestions would be awsome

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Unread 07-26-2009, 06:54 PM   #32
zeus87gn
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Which Holley do you have?
The 350?
If so, you don't have it set up right.
I leave mine sitting for better than a week at times and it cranks up no problem.
A 500cfm is too big for a stock 258.
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Unread 08-20-2009, 04:27 PM   #33
Smtty58
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I'm in the process of swapping a 2300 onto my '90. Zeus, looking at your pics it seems you did away with the bellcrank for the throttle and ran the cable straight to the carb. Did you keep the stock cable or have to find a shorter one? I'd like to set mine up like yours because if I run the stock bellcrank, the rod hits the throttle body. Also, how did you plumb the charcoal canister? Any tips on how to block off the exhaust pipe when I remove the pulse air?
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Unread 08-20-2009, 06:37 PM   #34
zeus87gn
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Hey Smtty,

Not sure what you mean by bellcrank, but I did run the throttle cable straight to the carb. I just twisted the stock cable into position after I had the cable mount custom bent and welded as you see it.

I removed my charcoal canister. I can get away with it here in Ga. I'm moving to Texas next week so I may be putting it back into service. If so, I'll just hook it back up to a ported vacuum and have what I need.

Z
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Unread 08-21-2009, 05:19 PM   #35
Smtty58
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Here's a pic of my cable. It curves down to the bellcrank, then a rod runs up to the throttle. If I run the cable right to the throttle, it will be too long, unless I put a loop in it. Is this what you did? I can rig up another bracket, that's not a problem. I'm just concerned about having a loop.

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Unread 08-22-2009, 07:04 AM   #36
zeus87gn
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The stock linkage setup won't work. It's trying to pull down and you need the linkage to pull backwards - toward the firewall. Yes, there is a slight loop in my cable to get it to work correctly. I'll get that picture posted Monday so you can see how I made it work. I modified the stock bracket you show in your picture.

Also, you are going to have problems with that universal adaptor plate. It doesn't seal properly to the base of the Holley for correct operation. I fought with one for over a year before I went to see some pro engine builders and they helped me find the problem. Once I got that solid plate made, I was able to tune it.
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Unread 08-23-2009, 03:40 PM   #37
Smtty58
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I went with the Mr. G adapter because I had one laying around. I filled the slots with RTV based on a post I saw here. Got it running today, showing 18.5-19" of vacuum at idle, so I think all is well. There's a stumble when goosing it, but I'm still running the 61 jets. I've got a set of 55s I'll try, if they don't work out I'll get some 58s. Also thinking of dropping the pump nozzles down to .028 from .031. The pump shot looks pretty hefty. I put a less aggressive pump cam on, but that didn't help. Right now I'm running the bellcrank. There's a ballstud on the Holley, below and aft of where you have your cable mounted. Pulling down it seems to be working out, the geometry looks good. I'm running a CJ rod from the Holley to the bellcrank, which is a hair too long, so I'll try and make a new rod at work this week. Looking forward to seeing your cable pics. If I go digging through my junk pile I have a bunch of those cable brackets to play with. I'm running an 11" air cleaner, cleared nicely after I tweaked to booster hose. I'll get some pics up soon.
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Unread 08-24-2009, 05:05 PM   #38
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Spent a little time with it today. I'm not seeing any fuel coming from the booster venturis. That could be my stumble. I'll pull it apart tomorrow and check the main circuit.
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Unread 09-01-2009, 04:40 PM   #39
zeus87gn
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Smtty,

Any luck with your problems?

Z
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Unread 09-03-2009, 02:45 PM   #40
Smtty58
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I've been real busy this week, haven't had time to work on it. I've been reading a lot of MC2100 swap info, as it uses the same adapter. A lot of leak related stumble problems there too. This weekend I'll pull the carb and look at the gasket. Then I'll decide where to go from there.
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Unread 09-22-2009, 02:39 PM   #41
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The gaskets looked fine, no evidence of a leak. This carb came with my CJ, and it had the same stumble on that motor. No adapter, it was on a Clifford. And after rebuilding it and fighting with it couldn't get it solved. So I rebuilt the Carter and Nuttered it, runs great now.
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Unread 11-07-2009, 07:24 PM   #42
WVHotWheeler
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On the #42 injector nozzle is that a .042 accelerator pump discharge nozzle/ what did the carb have on it to start with? Im have a simular problem, But I have the Clifford intake/pace setter headers/HEI/holley 350/Holley elc pump, between 2000 and 3000 RPM sputers/up hill no power/gas milage sucks, plugs completly BLACK, I have about 19,19.5 of vac on manifold,I had thought the carb was bad went and got a new one same problem, Was about to go #@$&^(* nuts,Then found this thread.
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Unread 11-07-2009, 07:33 PM   #43
zeus87gn
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Honestly, I don't remember what it has first.
I'm thinking it was smaller, like 39 or something.
Before you dive too deep into the injector nozzle, make sure your power valve is right for your vacuum in the manifold.
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Unread 11-08-2009, 07:31 AM   #44
WVHotWheeler
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OK my manifold is showing 19 or a little above so I was thinking that a 9.5 would be the correct size, the first carb I tried was used it had a 5.0 power valve and 58 jets the new carb has 8.5 power valve and 61 jets, plug are still black, I had replaced everthing in the brand new HEI dissy with new ACCEL parts had the same responce so Im hoping what you have done with your carb will work on mine,I have the the Holley 450 4bar that I was going to use at first glad I did'nt now,Thanks for anymore info you may add,Kenneth
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Unread 11-10-2009, 06:01 PM   #45
zeus87gn
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WV, have you tried my setup?

With 19" of vacuum, a 9.5 PV would be just right.
I don't know if Holley make s one that size right off, but if it's available go for it.
Please post up your results for all to to know.
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