366 big block carb question

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366 big block carb question

Postby nelson on Sun Jan 26, 2014 10:30 pm

I have a 1981 Chevy C70 dump truck that has a stock 366 big block tall deck in it and curious about what carb to run. It has a holley on it now but not sure of size. Its the one with single inlet with the tube that leaks with the O rings. It doesn't run worth a crap and think I need more carb. Especially when loaded heavy. I have another holley #3310-4 vac sec. Too much? Not enough? What should I use for it. Thanks
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Re: 366 big block carb question

Postby msims on Mon Jan 27, 2014 12:44 am

have you checked fuel filter?? timeing just a few degrees slow will make it labor//or fast will too//
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Re: 366 big block carb question

Postby msims on Mon Jan 27, 2014 7:47 am

check float level ???
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Re: 366 big block carb question

Postby nelson on Mon Jan 27, 2014 8:31 am

I just put all new filters plugs and wires on it and checked timing and it was where it should be. Is the 750cfm carb too much? I am taking that other leaky pos off.
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Re: 366 big block carb question

Postby msims on Mon Jan 27, 2014 10:16 am

750 b gods plenty thm truck motors hve small valves and low compression for pulling power not high RPM most wont go over 4000 RPM not need lot carb lot of had 2 barrel carbs
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Re: 366 big block carb question

Postby nelson on Mon Jan 27, 2014 2:31 pm

Ok. Thanks. Its just what I have but will look for a smaller carb. Just want to get rid of that holley with the fuel tube going to the back bowl. Thanks again
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Re: 366 big block carb question

Postby msims on Mon Jan 27, 2014 3:12 pm

put o rings in urs
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Re: 366 big block carb question

Postby msims on Mon Jan 27, 2014 3:14 pm

put the 750 on it and try it //if it dont work then go get somethng else
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Re: 366 big block carb question

Postby nelson on Mon Jan 27, 2014 4:06 pm

I have put three different sets and it still leaks. Not sure if bowl is egg shaped but the tube is fine. Going to try the other and hope for the best. Lol. Thanks for the help.
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Re: 366 big block carb question

Postby OLD YELLER on Mon Jan 27, 2014 5:36 pm

I've put a 750 holley on several of these 366's...As long as the engine's good shape,they work great...... :arrow: :arrow:
The older I get, the better I was.....
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Re: 366 big block carb question

Postby nelson on Mon Jan 27, 2014 7:04 pm

The engine itself is in perfect condition. Did a compression test and all cylinders were within 7 psi and the lowest was 138. Just did a plug and wire change now got to square out the carb. Thanks for all the help. Stupid question but a regular 396-454 intake will not fit correct?
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Re: 366 big block carb question

Postby pepsiman 31 on Wed Jan 29, 2014 1:38 am

You did not mention cap & rotor better change them also check inside of that dist. for things worn out like the advance weights see if the pins they swing on are worn out. you can repair them with a bushing repair kit . also check fuel pressure

keep all of us advised on what you find
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Re: 366 big block carb question

Postby nelson on Wed Jan 29, 2014 6:03 am

I did forget to mention that the dizzy had a plastic piece where the vac advance should be that locked the advance in and I replaced it with a vac advance canister and hooked it up like it should be. I dont see a difference with or without the plate in how it runs for the most part but haven't ran it much. Should I put the plate back?
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Re: 366 big block carb question

Postby pepsiman 31 on Thu Jan 30, 2014 8:45 am

Go back and take the rotor bug off and see if the advance weight's move free they can seize up lube them ,doesn't take much oil and then see if the pivot pin's have a lot of slop they can still bounce around to affect smooth advance
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Re: 366 big block carb question

Postby nelson on Thu Jan 30, 2014 9:09 am

I checked that last nite and the springs and advance weights were pretty wore. I put new ones on and used the lightest spring to bring advance in early. Going to try the new carb tonite. Also looking for a set of headers since I need to replace the exhaust anyways. Or should I leave the manifolds on there?
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