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GMC V6 and V12 Engines Engine repair and rebuilding

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  #1  
Old May 17th, 2017, 02:42 PM
bpmcgee bpmcgee is offline
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Default Stromberg WW throttle return spring

Does anyone have a picture of the stock setup? I'm de-converting the Holley the PO had put on, and he just hooked a long spring around an A/C Compressor bolt.

B
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  #2  
Old May 17th, 2017, 09:58 PM
AZKen AZKen is online now
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Default Re: Stromberg WW throttle return spring

Here is what I did. 305E. The dirty valve covers are temporary. I have plaid. The tab bracket is original way of attaching spring front. Not sure about carb end of spring. Only place that works for me. Spring straight and level.
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Last edited by AZKen; May 17th, 2017 at 10:08 PM.
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  #3  
Old May 17th, 2017, 10:09 PM
bpmcgee bpmcgee is offline
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Default Re: Stromberg WW throttle return spring

By "tab bracket" you mean the piece of metal which appears to be fastened down by a head bolt that your spring fastens to?

B
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Old May 17th, 2017, 10:14 PM
AZKen AZKen is online now
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Default Re: Stromberg WW throttle return spring

Yes, that is a GMC original. You can make one easily. It's on the water crossover bolt. You can also see it on our "GMC Plaid Valve Covers" Jolly page. I may have one somewhere.
P.S. you never acknowledged/answered your pulley question post?

Last edited by AZKen; May 17th, 2017 at 10:39 PM.
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  #5  
Old May 17th, 2017, 11:09 PM
bpmcgee bpmcgee is offline
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Default Re: Stromberg WW throttle return spring

Quote:
Originally Posted by AZKen View Post
P.S. you never acknowledged/answered your pulley question post?
Yeah, I went out for a joy ride on Saturday and ended up having to get towed home -- the float valve appears to have gotten grit wedged in it and flooded the engine. I haven't had a chance to fiddle with it since then.

B
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Old May 18th, 2017, 12:11 AM
AZKen AZKen is online now
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Default Re: Stromberg WW throttle return spring

Was that the Holley? That must be why you are de-converting. I think that is a good idea.
WW or Rochester. Good, simple carbs.
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Old May 18th, 2017, 05:01 AM
bpmcgee bpmcgee is offline
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Default Re: Stromberg WW throttle return spring

No, it was the rebuilt WW. I thought I could get away with the original setup of no fuel filter

I'm converting back because the truck only got 5 mpg with the Holley, and the Stromberg fits and looks better with the oil bath oil filter. I'm guessing the Holley was set up all wrong anyway, because I don't notice any difference in power.

B
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Old May 18th, 2017, 05:11 AM
bigblockv6 bigblockv6 is online now
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Default Re: Stromberg WW throttle return spring

Which Holley 2bbl do you have? There is 500cfm #4412 carb and then there's the smaller the 350cfm version #7448. If you're running the smaller 350cfm version then it's fully understandable there are no performance gains over the stock WW carb. If it's the 500cfm carb then it has some serious issues
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Old May 19th, 2017, 05:18 PM
bpmcgee bpmcgee is offline
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Default Re: Stromberg WW throttle return spring

I just checked -- it's the 4412. A lot of the changes that were made to the truck were done poorly -- sometimes I feel less like I bought the truck and more like I staged an intervention

B
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Old May 20th, 2017, 03:11 PM
James James is online now
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Default Re: Stromberg WW throttle return spring

Taking the Holley off and installing a renew kit and installing smaller jets (which is available and you might have to change the jets again until you settle on the one right for the engine) should show more power/economy gain. Holley spec for the 4412 main jet is 73 (the number is stamp on the side of the jet). A smaller number is leaner, I would only go 2 sizes smaller until I get it close then one size at a time to get it dial in.

However if you still what the Stromberg on your engine that fine too. Then would you sell the Holley, I hate to see it go to waste?
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