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Author Topic: Rochester replacement  (Read 3527 times)

Offline JohnnyPopper

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Rochester replacement
« 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?
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1957 Apache 3100 235 Inline 6, 3 on the tree
1973 C-20, 3+3 454 4BBL TH400  Water Injection
1978 K-10, 350 4BBL TH350 NP203 M.M. Part time Kit/Hubs
1980 C-10 under construction

Offline JohnnyPopper

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Re: Rochester replacement
« Reply #1 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!!!  :(
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1957 Apache 3100 235 Inline 6, 3 on the tree
1973 C-20, 3+3 454 4BBL TH400  Water Injection
1978 K-10, 350 4BBL TH350 NP203 M.M. Part time Kit/Hubs
1980 C-10 under construction

Offline Mike81K10

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Re: Rochester replacement
« Reply #2 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.
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Offline VileZambonie

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Re: Rochester replacement
« Reply #3 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.
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74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline Shifty

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Re: Rochester replacement
« Reply #4 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. 
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87 V20 Standard Cab Longbed (current)

87 R30 3+3 Longbed (days of yore)

98 C2500 ext cab longbed

Offline MIKE S

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Re: Rochester replacement
« Reply #5 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. ;)
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Offline JohnnyPopper

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Re: Rochester replacement
« Reply #6 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.
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1957 Apache 3100 235 Inline 6, 3 on the tree
1973 C-20, 3+3 454 4BBL TH400  Water Injection
1978 K-10, 350 4BBL TH350 NP203 M.M. Part time Kit/Hubs
1980 C-10 under construction

Offline Stewart G Griffin

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Re: Rochester replacement
« Reply #7 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.

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Offline JohnnyPopper

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Re: Rochester replacement
« Reply #8 on: July 10, 2022, 11:17:04 am »
Thank man!
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1957 Apache 3100 235 Inline 6, 3 on the tree
1973 C-20, 3+3 454 4BBL TH400  Water Injection
1978 K-10, 350 4BBL TH350 NP203 M.M. Part time Kit/Hubs
1980 C-10 under construction

Offline Big Dee

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Re: Rochester replacement
« Reply #9 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.
;)
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85C30...
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