commander_47

I am not a fan of these, as most of you know. But I often stumble across them in my travels.

This one, I believe, is from a 79 auto Corvette according to the serial number.

I have gotten many parts from Glenn and he's an upright guy.

Anyone needing one of these for a restoration might grab it.



http://www.ebay.com/itm/GM-Chevy-Rochester-Q-jett-carburetor-/181757818279?hash=item2a519c35a7&vxp=mtr

REELAV8R

Funky number. 1705 denotes 76 through 79. Fifth digit is a 4 though, which would indicate a 74? Then the Julian date indicates 85th day of 79. what am I missing?

Shark Racer

It's most definitely a 4M (68-74), not an M4M (75-80). The quickest hint is the shape of the boss behind the choke flap. A single round boss = 4M. M4Ms have a wider, more rectangular boss with the round boss at center. I've seen some 4Ms with the wider boss, but not very common at all.

The lack of an APT access hole and the shape of the area between the front carb-to-intake mounting bolts is also clues as to 4M vs M4M.

Regardless, I'm happy to see commander_47 passing along deals.

Revi

This carburetor has a part number of 17054930 and used on 74-77 Chev /GMC/Truck .

http://www.carburetion.com/CarbNumbe...umber=17054930

jnb5101

See how clean that sucker is? Somebody has been there and done who knows what to it. The best carbs to buy from the bay are the dirty disgusting ones that have been on a shelf or an unused motor for 30 years.

commander_47

Something does seem quite odd though.

The Julian date code is 0859. That would denote the 85th day of 1979.

We know the 1705 means 76-79. Is it possible it was built in 69? I don't see how.

This is apparently some sort of refurb/replace.

Revi

With some carbs the "1" indicates an "over the counter" part, also with some carbs there is a triangle block casting on the front drivers side that isn't present on factory installs. I believe this carb is an "over the counter" replacement built in 1979 or 89.

commander_47

I happen to know this was on a 79 corvette.

If its a replacement, its a good one.

I dont believe it could be 89 simply because the first 4 numbers would be 1705.

A 1704 would not be made in 89 or 69.

Im sure it is numbered for an automatic chevy. M4 series.

If its a replacement they matched it pretty good.

Shark Racer

From the top, a 79 carb would look like this one (this is a 78, 17058204):


79 baseplates had idle mixture screws capped, whereas if you look at this one they're pretty well exposed.

An early carb will fit a later car pretty well, you'd have to bend the fuel line just a little bit closer to the filter as the later fuel filters stick out further.

Late last year I did a swap the other way, 79 Camaro carb on 1970 'vette w/ a 496. Only mod for fitment was trimming the fuel line shorter.

Revi

Part #17054930 is not a Corvette carb. It will work on one, but it was not originally installed on one. http://corvettec3.ca/carb.htm

commander_47

I believe ya.

CanadaGrant

If it was a 69 it would not start with a "1" As an example my 69 is a 7029215. 17 would denote 70's or later.

lars

It's a Service Replacement (SR) carb for a 74-77 Chev/GMC Truck built in 1979. Properly set up, it will run fine on a Vette or any other car, and it has the physical appearance of a 1974 Q-Jet.