Rochester 2GC info

T Ketels · 10-01-2015, 07:20 AM

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

NORMAN BARNARD · 10-01-2015, 03:05 PM

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 Any way, this p/n has been superceded by 3310-807312-1, so i'm told....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.

NORMAN BARNARD · 10-02-2015, 04:06 PM

Dwight southerland, pm sent......

outlaw · 10-09-2015, 10:40 PM

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

NORMAN BARNARD · 10-10-2015, 11:24 AM

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.

10-09-2015, 10:40 PM	#4
outlaw Member Join Date: Aug 2008 Posts: 137 Likes: 80 Liked 132 Times in 52 Posts	Re: Rochester 2GC info I have a mercury marine 2gc that's 1 3/8 casting no sleeves no bore marks. Number 7044185

10-10-2015, 11:24 AM	#5
NORMAN BARNARD Member Join Date: Mar 2006 Location: EL PASO, TEXAS Posts: 156 Likes: 0 Liked 2 Times in 2 Posts	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.

10-01-2015, 07:20 AM	#1
T Ketels Junior Member Join Date: Jul 2005 Location: Dyersville, Iowa Posts: 52 Likes: 0 Liked 0 Times in 0 Posts	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! Attached Thumbnails __________________ SS/MA 5017

10-01-2015, 03:05 PM	#2
NORMAN BARNARD Member Join Date: Mar 2006 Location: EL PASO, TEXAS Posts: 156 Likes: 0 Liked 2 Times in 2 Posts	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.

10-02-2015, 04:06 PM	#3
NORMAN BARNARD Member Join Date: Mar 2006 Location: EL PASO, TEXAS Posts: 156 Likes: 0 Liked 2 Times in 2 Posts	Re: Rochester 2GC info Dwight southerland, pm sent......