Re: Rochester 2GC info
 

T ketels.....that's the one!!!!!! They work "super" with a little prep
work...... Not like the work that has to be performed on the 50 plus year old rochester (if you can find a good one)....

Re: Rochester 2GC info
 

Click the bar at the top of the picture for full size.

http://classracer.com/classforum/att...9&d=1443654414
http://classracer.com/classforum/att...8&d=1443654362

Re: Rochester 2GC info
 

Looks like the throttle shaft is machined away.They won't be approving that!

Re: Rochester 2GC info
 

Tim, can you please verify that the carb's in the pic's truly have "sleeves" and also send me the carb. Numbers off the bowl's
please. You may have to scrape off the factory painting to reveal them..

I made a copy of the picture looking down the top for reference
as i've never seen sleeves in stock marine carb's, then went to the shop where we have two being built...look'd the same, perhaps it's a reflection or a shadow from the camera.

Just curious, and making sure i haven't missed something along the way...... Thank you for your time......norm

Re: Rochester 2GC info
 

Mark, if your refering to the throttle shaft where it exit's the passenger side of the carb., marine carb's do not have a thru hole like the rochesters. It's a blind hole in the casting to keep out the salt water and a occasional spilled adult beverage !!!!!

Rochester's we pressed in a small soft plug for the above.....

OOPS, I JUST SAW WHAT YOU WERE TALKING ABOUT, MARINE CARB. SHAFTS ARE MOUNTED UPSAIDE DOWN (FLAT SURFACE UP, MAKING IT LOOK LIKE IT'S BEEN INTENTIONALLY MACHINED)
THROTTLE PLATES ARE SANDWICHED BETWEEN THE SHAFT'S UPPER AND LOWER HALF, LIKE THE ROCHESTER AND RETAINED WITH BRASS SCREWS LIKE THE ROCHESTER.......

Re: Rochester 2GC info
 

Here are a few more pictures of the marine 2G. You are correct, the throttle shaft is slabbed which would definitely not pass tech!

Re: Rochester 2GC info
 

Ok, here we go on the two marine carb'.....in question.

Photo #1with bowl marking of 06082a-1 s/b "8"o682a-1 (probably still covered by paint). Any way, this p/n has been superceded by 3310-807312-1, so i'm told....

Photo #2 shows the bottom of the venturi hsg. And yes this early style carb. Originally came with venturi inserts and a detachable baseplate off a rochester carb. M/marine pluged the
two original idle screw holes, then tap'd the front middle vac. Hole for the "one" idle application. Then machined the base plate idle channels to intercept with the original channel that feeds the idle circuit and the transission slot. Sorry, i was unable to find the venturi spec's, maybe the originator of the post could measure and report.

Photo #3 shows the roch. Baseplate that attaches to the venti
hsg. With "3" screws. Shaft is like the roch. Flat is on the bottom, radius is on the top countersunk for the attaching screws.

Remember this is the "old style marine" not the one that is presently available and dimensionally meets the published spec.

Re: Rochester 2GC info
 

Dwight southerland, pm sent......

Re: Rochester 2GC info
 

I have a mercury marine 2gc that's 1 3/8 casting no sleeves no bore marks. Number 7044185

Re: Rochester 2GC info
 

The 6th digit of an 8 indicates it's a non gm part. It's truly a merc. Marine carb. Installed on a 4.9 liter motor. Venturi should be large bore (1.375) and 2 idle screws under the float bowl

check the booster leg to see if it has the good booster #38864,
if it does, then it's a good start for maybe a stocker.

Re: Rochester 2GC info
 

Does anyone have contact info for Mike Town? Thanks in advance.

Re: Rochester 2GC info
 

You can find Mike on Facebook or PM me your Name and Phone# and I will forward to Mike

Re: Rochester 2GC info
 

This is a timely thread. I'm about to give the 350/230 a try in a car I built. I have a bunch of big 2 barrel cores, both venturi sizes, but the booster with the number is the kind of info I need. These are a pretty simple carb, there were a ton of 350's out there with them at one time, it should work. I had a 250 horse 348 when I was about 40 years younger,it was in an Impala with a 4 speed( broke more than a few third members with it, chucked a few 2 pc drive shafts, spent a lot of time fixing it again, but that was during the years this goofy state required you to install a retro NOX device to disable the vacuum advance, and it came with instructions on how to readjust the car's idle speed and mixture so as to attempt to reduce idle emissions, but all those devices did was reduce gas mileage and cause hard cold starts and stalling at idle. It seemed that factory multiple carbureted engines were exempt, so I got a complete 348 tri
power set up with intake,carbs,fuel lines,linkage and air cleaners for next to nothing and rebuilt the three carbs and installed it. I still had to disable the vacuum advance, but we had a Sun distributor machine in the place where I worked, that and a distributor curve kit with lighter springs and heavier weights made up for that. A co worker had a very nice 389 4 speed '64 GTO, we had to trim power that thing as well. The 64-65 had the large secondary carbs and the center one was a small 2GC,the '66 had three large 2 barrels. We got pretty good at making those things work,but that was a lot of years ago. This thread brings back some good memories,but that was then,this is now. Technology has improved a bunch as well. I'll be referring to this thread a lot in the coming weeks,maybe we can all compare ideas and get something done here.

Re: Rochester 2GC info
 

PM sent to G Anderson

Re: Rochester 2GC info
 

Anybody have one or two of that good booster,#38864 you'd sell me? PM or email chevellegreg7376@hotmail.com.

Re: Rochester 2GC info
 

Easier solution is just leave the power piston in place, and plug off the power valve it's self... Take an Old Power Valve (or new), knock the pin & guts out of it... Turn it over and pound 3/16" lead shot into it... Now put the gasket back on it and reinstall into the bottom of the bowl... Jet to application.

Re: Rochester 2GC info
 

Seems to me, I soldered one shut on the tri-power setup.Heated it up on the stove,since its brass,it tinned up and soldered up real well.

Re: Rochester 2GC info
 

Mike, I agree its interesting stuff, but the circle track 2GC`s are more modified than NHRA allows. Learn what you can and have fun.
Mike A114