Poor gas mileage with 225

Well I got the new intake mainfold gasket, and carb. Well . . . I think that I am 180 out. As far as the carb is conserned, how many turns should the needles be out for the motor to run at idle? Right now I am at 1 1/2 turns, as a starting point.

 

FSM says turn in finger tight and then out one turn for preliminary adjustment.Warm up to operating temp. Set idle at 650 to 700 rpm. Adjust screws to obtain smoothest idle. Readjust idle speed as necessary.

 

Un fortunatly the last vacuum gage that was put on the motor. The gage was all over the place. I guess that I will have to pick one up? What is an FSM

 

That may have been a sign of problems with your engine, not the gauge.

 

231 Buick, balanced, bored .030, Isky cam, stock 2 barrel GM and manifold DUI distributor and small tube full length headers with turbos. Dana 44 front SM420 and Dana 60 rear ( in other words HEAVY running gear!) 4.56 gears and LTB 34/10.50/15 rubber.

IF,,,, (note that is a big if!) I drive economicaly I can better 16 to the gallon............That is contributed to good ignition, simple carbueration and an efficiently set up mechanicaly sound engine. The small tube headers also help.

 

Does anyone have the link to DUI?

 

Performance distributors I believe is where I found the DUI.

 

Tim Reese in post #19 is right on the money. Headers are designed to make the exhaust free flowing, but if they are not "TUNED HEADERS" they are worthless. Tuned Headers are distinctive by the shape of the tubes coming off the rear most cylinders. They usually have several curves in them for no apparent reason. The idea is to keep all of the tubes the same length before they go to the common collector. If all the tubes are the same length and they are the correct length, they will allow the exhaust gasses to escape without pushing back into the other cylinders. They also prevent the new gas mixture coming in as the intake valve opens right at the end of the exhaust stroke.

 

I just rebuilt my 2G carb and found some references said 1 turn out and some said 2 turns for preliminary adjustment. Mine were set at 1 3/4 before the rebuild.

 

The headers are from Hedman, wether they are tuned or not I am not to sure. Yes I have/had I hope have been sealed. I am going to start with 1 1/2 turns for now and move up from there.
$370.00 for a DUI distributor?

 

300- 320 for the odd fire dui

 

1. Ok . . . well I have put in a new re-manufactured 2 jet and intake gaskets . . . now the motor back fires up thru the carb going up a hill (means that it is lean) and BIG BANG thru the exhaust at either cruising speed or going down hill (means that it is rich) I can not see how it can be both? HELP!

2. I took the oil bath filter off the top and put a paper filter on.
3. On the old carb there was a vacuum inlet that came from the EGR valve is this needed? Will I have to make a spacer plate to replace this? Also, where the oil bath had a hose that went to the top of the filter is this needed? Or can I attach this to the EGR vacuum inlet?

This is really getting me frustrated in trying to fix these issues!!!
I can use some help!!!