steve4570

What carburetor did the 1970 454 corvette come with. I have a Carter Quadrajet but not sure if this is original. What numbers and markings would identify the original carby. Also does anyone know what jetting it came with. Thanks for any information you can come up with.

70Stingray275

Hi Steve,

welcome to the club, I have a 70 also.

Do you have the original specs? Does it still have the same engine?

The number should be on the carb as 7040205 or 7040204 for a big block.

Hope that helps

70BBvert

7040205 for 4 speed, with ECS it would be 7040505
7040204 for auto, With ECS it would 7040504

A good online reference;

http://www.1970corvetteregistry.org/codes.html

Jim

steve4570

Hi guys thanks for your help. Yes the LS5 is original and has done 103,000 miles. I'm trying to gain as much information as I can. Many thanks, Steve.

Alan 71

Hi Steve,
In addition to the part number stamp there is a date code stamp nearby.
It consists of 3 digits for the "Julian Date" (001 thru 365) and then a single digit (9, 0, 1, etc.) for the year.
When you compare that date to the date when your car was built you'll have an idea whether this carb is indeed the one that was on the engine when it left St.Louis.
Regards,
Alan

PRNDL

What about Carter vs Rochester? I have a vague memory that some 1970 corvettes had Qjets made by Carter, but I don't have a reference. Anyone know about this?

Mike Ward

Very common to see them mixed. Rochester didn't have the manufacturing capacity to keep up, Carter became a second source vendor.

70Stingray275

Yeah Mike, They really had a monopoly when you look at all the cars of that era, passenger and coupe with number pus applications and configurations.

Check out this decoding site.

http://www.cliffshighperformance.com...carb_ID_2.html

LT1driver

never seen a carter q-jet on a 70 vette and I have had 4 of them, 1 BB, 3 SB and all owned back in the day when not over 3-4 years old.

joewill

i have never seen a carter on a 70. I have seen rochester only. doesn't mean it didn't happen.
one section of the judging guide states rochester only for 70, another section says some rochester carbs are manufactured by carter ( somewhat nebulous) but use a different date code format ( MY for M=month and Y = year.. if carter then you should see the word 'carter' somewhere on the carb. Tell us what the code is?

Lars' tuning paper will tell you what the stock jetting and rods are. Ask him.

70Stingray275

The only Carter's I have heard of we're on c2's, might be wrong.

LT1driver

what numbers are on the carb...picture would help

lars

I see Carter-built Vette Q-Jets regularly, for all years and applications. The early Carter-built Q-Jets had Carter-unique numbers, and there is little information regarding the application crossover. Other Carter Q-Jets used the regular carb number, but without the "70..." or "170..." prefix, since the "70" and "170" prefix is the Rochester-specific designator. This changed sometime in the '70s, because I've seen many of those Carter-built Q-Jets actually using the full "70..." and "170..." part numbers. The Q-Jet, in most literature, is typically referred to as the "Rochester Q-Jet," regardless of the vendor building the carb: A Carter-built carb is still a "Rochester Q-Jet," and most of the Carter carbs have the Rochester logo in the bowl casting.

Lars