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73-87 Chevy _ GMC Trucks => Fuel Systems and Drivability => Topic started by: JohnnyPopper on July 07, 2022, 06:08:43 pm

Title: Rochester replacement
Post by: JohnnyPopper on July 07, 2022, 06:08:43 pm

Hey gang,

1978 K10 Mr. Goodwrench 350 CID, 350 THD, Converted NP203, 3.41:1, Cali truck, EGR  >:(, Rochester Carb.

I looked for a local rebuild outfit, found two, both said to replace it with an Edelbrock, would get better mileage.

These days I wouldn't mind that!

Any recommendations?

Title: Re: Rochester replacement
Post by: JohnnyPopper on July 07, 2022, 07:30:04 pm

Should have stated, the reason for the post is I would like to get better mileage.

At these prices it will pay for itself quite quickly.

While you hear Cali State tax is 51-55 cents, when you add it all the other 'fees' it's 1.30 per gallon.

Greetings from the land of Fruits & Nuts!!!  :(

Title: Re: Rochester replacement
Post by: Mike81K10 on July 07, 2022, 09:45:08 pm

I could be wrong! However, I have had both on my truck and did not notice much difference. I have my Rochester back on now. EFI would probably give you better fuel economy.

Title: Re: Rochester replacement
Post by: VileZambonie on July 08, 2022, 06:02:34 am

You won't get better fuel economy from an Edelbrock. If that's the advice they gave you then stay away from them.

Title: Re: Rochester replacement
Post by: Shifty on July 08, 2022, 09:07:44 am

Quote from: VileZambonie on July 08, 2022, 06:02:34 am

You won't get better fuel economy from an Edelbrock. If that's the advice they gave you then stay away from them.

What Vile said...

It's tough to beat a (good running) Rochester with it's smaller primaries for penny pinching mileage. 

Title: Re: Rochester replacement
Post by: MIKE S on July 08, 2022, 03:01:58 pm

It won't pass smog in Calif with an Edelbrock unless you have friends in low places. ;)

Title: Re: Rochester replacement
Post by: JohnnyPopper on July 09, 2022, 04:51:03 pm

Thanks guys   ;D

I think I'll check out Cliff Ruggles, he seems well spoken of, unless you have a differing opinion.

Title: Re: Rochester replacement
Post by: Stewart G Griffin on July 10, 2022, 10:58:33 am

Cliff is very good, but he may be backed up.

If so, i have had pretty good luck with this unit:
https://www.jegs.com/i/JEGS/555/15805/10002/-1

i believe these are 83-84 truck cores and i believe they are re manufactured by JET for Jegs.

Title: Re: Rochester replacement
Post by: JohnnyPopper on July 10, 2022, 11:17:04 am

Thank man!

Title: Re: Rochester replacement
Post by: Big Dee on July 10, 2022, 12:47:30 pm

Used both carbs and the Qjet is on now. it is a bit more effort to tune the rods and jets on the Qjet but it fits right and is the original #'s
The disk brakes should be checked for drag as this will have a large impact on m.p.g..
If the automatic transmission is holding back the truck, it will really slow down the fun factor.
;)