Rochester 1 bbl Carb rebuild (without Power piston rod)

[rwogs]

1972 chevy C10 250 CI engine Rochester 1 Bbl carb (#7042021) M-MMV.

I'm rebuilding the 1 bbl Rochester carb on my Chevy truck. When I opened it up and removed the power piston, there was no rod inside to activate the power piston (#45 on an exploded view of the carb). I thought I may have lost it in disassembly, but when I looked underneath the float bowl, the opening that the Rod for the Power piston would stick through, it was plugged with a rounded, apparently factory installed object/plug. (see pic below) It is a rebuilt carb (I inherited this about 12 years ago from my father-in-law and he bought it used a few years before) but I can't tell who rebuilt it. Has anyone ever run into this? I have another question about a suitable replacement carburetor for this one, but I'll put that in another post.

[Steeveedee]

Chevy Vegas ran carbs without the power piston, as well as the 4-cylinder Chevy Novas, which (I believe) were discontinued after 1970. Talk about some gutless dogs. Maybe ask Cliff Ruggles or Ken Betts, They're the remaining carburetor experts of that era.

[rwogs]

That's good information. I never knew they made a 4 cylinder Nova LOL. I really didn't expect the 6 cylinder truck to have a bunch of power, but I never really noticed a lack of power either. I just wonder what they were thinking by putting it in there without a rod!! Crazy.
Thanks again.

[geezer#99]

The Chevy 4 banger was known as the ‘Iron Duke’.
Look here for more info.



https://www.carburetor-parts.com/

[rwogs]

I tried the carb parts site and they weren't able to help. It is a good resource though, thanks.

[rwogs]

I was not able to find either member you mentioned, but my next question should be easier.

[Steeveedee]

Neither of those guys are members here. Sorry if I gave that impression. Cliff is trying to retire, or did.

You can find Ken at https://www.everyday-performance.com/

They do Quadrajets mainly, but if they don't do your carburetor, could point you to somebody who can.

[rwogs]

Originally Posted by Steeveedee

Chevy Vegas ran carbs without the power piston, as well as the 4-cylinder Chevy Novas, which (I believe) were discontinued after 1970. Talk about some gutless dogs. Maybe ask Cliff Ruggles or Ken Betts, They're the remaining carburetor experts of that era.

I think you are absolutely correct! This is an image from Ebay of a Rochester
1 bbl Carburetor that says it is for a 1972-1975 Vega...Look at this image...no linkage in the hole for the power rod linkage..
Might be a coincidence, but maybe not.

[Steeveedee]

To add to my post, though going a bit off topic, the engines in the Novas were all cast iron, but the Vegas had an aluminum/silicon alloy block and a cast iron head.

[RichardJ]

You guys are talking about 3 totally different 4 cyl engines.

The Chevy 153 4 cyl used in the Nova and early G series vans looked exactly like the 194/230/250 inline six, only shorter. it even had a few interchangeable parts.

The 151 in. 4 cyl Iron Duke was a 2.5 L Pontiac engine even though it had the Chevy bell housing pattern. Totally different engine that even had a couple of totally different variants of its own.

How could you confuse the 2.3 OHC Vega Engine with either of the two above. Over Head Cam?

[54blackhornet]

Mikes Carburetor is your guy ! He knows his stuff. At least on 2 Jets ?

[rwogs]

Thanks, I've reached out to him and he's got nothing in stock apparently.

[54blackhornet]

Is the carb a MonoJet ?