rochester 4jet - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 03-12-2001, 10:02 PM Thread Starter
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rochester 4jet

whats the difference between this and a quadjet???is it worth useing if i have it here??

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post #2 of (permalink) Old 03-12-2001, 10:32 PM Thread Starter
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Re: rochester 4jet

it looks like this...


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post #3 of (permalink) Old 03-12-2001, 11:55 PM
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Re: rochester 4jet

"Spreadbore...meet squarebore."
"Squarebore...meet Spreadbore"
"Spreadbore here has much smaller primary bores so that it can run on less fuel, while still having those massive secondaries to give it kick."
"Squarebore on the other hand has equal sized bores which allows that the secondaries will double the primaries."

Which one you chose is based on desire. Do you want more low RPM power or higher RPM power?

From what I've seen, I'd go with the Q-jet, but then, I've never messed with a squarebore rochester.

Good Luck
Fritz

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post #4 of (permalink) Old 03-13-2001, 06:58 AM Thread Starter
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Re: rochester 4jet

thansk a lot.. that actually sounds perfect for rockcrawling...i think this thing came off a 63 impala...

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post #5 of (permalink) Old 03-13-2001, 02:44 PM
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Re: rochester 4jet

Hey Isnt that a Rochester Thermo-quad?


MARK (OIIIIO) LANGMOTORSPORTS
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post #6 of (permalink) Old 03-13-2001, 02:54 PM Thread Starter
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Re: rochester 4jet

it sez 4jet on it in about 6 places... nbut i really dont knowe a lot abpout it

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post #7 of (permalink) Old 03-13-2001, 03:02 PM
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Re: rochester 4jet

If you put that Monster on your crawler, keep the fire ext. handy.

post #8 of (permalink) Old 03-13-2001, 04:46 PM
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Re: rochester 4jet

According to the two Rochester books I have, it's a model 4G, Rochester's first 4 bbl carb. Used from '52-'67. It's a square-bore design with dual side-hung floats. If you're looking for the best carb for off-road, you need to update to a Quadrajet, which is also known as model 4M. It is a spread-bore design with a single center-hung float. I'm running the Edelbrock Q-Jet #1904 on both my Jeeps with great results. The only thing better than a Q-Jet is fuel injection.

Tim
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post #9 of (permalink) Old 03-13-2001, 07:01 PM
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Re: rochester 4jet

Chris,

Put that thing on a Chevy posting board!!! It's an antique. Those guys who restore them will eat it up. Look for a number stamped on it to identify it. Post it and spend the chevy cash on Jeep parts!!

CJeep

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post #10 of (permalink) Old 03-13-2001, 07:21 PM
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Re: rochester 4jet

It's exactly what Tim said. They weren't the greatest carb , even in their day. Thats part of the reason holley got to be a good upgrade. Sell it to someone with an old chevy and buy a Q-jet.


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