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Old 12-15-2014, 10:41 AM   #1
t.tosto
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Default Olds W-30 Carb

I know there are some very knowledgeable people on this site who know Oldsmobile's. What I have is a Q-Jet, #7040256, 1970 W-30 convert., 4-speed. The carb has no power piston, just a cup plug in the well where the piston would go. Is this original? Any info is appreciated, Tony Tosto, #3050 B/S.
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Old 12-15-2014, 11:08 AM   #2
Jeff Teuton
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Default Re: Olds W-30 Carb

Sammy Pizzolato is usually here. Ask Him. I think he still has one of them things.
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Old 12-15-2014, 11:29 AM   #3
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Default Re: Olds W-30 Carb

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Originally Posted by t.tosto View Post
I know there are some very knowledgeable people on this site who know Oldsmobile's. What I have is a Q-Jet, #7040256, 1970 W-30 convert., 4-speed. The carb has no power piston, just a cup plug in the well where the piston would go. Is this original? Any info is appreciated, Tony Tosto, #3050 B/S.
YES, no primary metering rods 4-speed, not sure automatic. FOR SALE???
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Last edited by Frank Bialas; 12-15-2014 at 11:31 AM. Reason: question added
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Old 12-15-2014, 11:29 AM   #4
dennis dunlap
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Default Re: Olds W-30 Carb

Tony, you are correct '70 442 w-30 manual trans hardtop or convertable 'auto trans is a 7040258 .Dennis, you have a pm thanks
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Old 12-15-2014, 04:00 PM   #5
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Default Re: Olds W-30 Carb

It's also worth a lot of $$$$!
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Old 12-19-2014, 01:56 PM   #6
Dwight Southerland
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Default Re: Olds W-30 Carb

A lot of those carburetors were used on jet pump installations for boats. A company in North Little Rock built the installation packages - engines w/pumps attached - back in the 70s-80s. Jacuzzi is a Little Rock based company. Not sure it was the same number, but they did not have a power piston. I had several once upon a time.
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Old 12-19-2014, 09:08 PM   #7
t.tosto
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Default Re: Olds W-30 Carb

Thanks to all who responded. I do restorations on GM muscle car Holly and Q-Jets, worked for Olds dealer in the 70's but never experienced this particular set up. Will run carb on test engine after restoration, wonder how the transition from idle to part throttle will be? Tony Tosto #3050 B/S
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Old 12-20-2014, 01:21 AM   #8
Mark Yacavone
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Default Re: Olds W-30 Carb

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Originally Posted by t.tosto View Post
Thanks to all who responded. I do restorations on GM muscle car Holly and Q-Jets, worked for Olds dealer in the 70's but never experienced this particular set up. Will run carb on test engine after restoration, wonder how the transition from idle to part throttle will be? Tony Tosto #3050 B/S
Tony, I suspect that if you have a mild ,short duration camshaft in the test engine ,it won't like it.
The W30 stick cam had a bunch of duration in it. I'm sure that was the reason for doing this.
Still surprised they did that, before HEI's were around to help clean up the mixture.
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