2300 on i6 258

S

scouttwo73

New member
I have a 258 in a 73 Scout 2 it had a Holley 1940. I got an adapter to put a Holley 2300 and put the carb on and it starts and runs for a second and dies and backfires out of the carb. Does it need to be retimed? Is there any other things that can make it backfire like that?
 
Was the engine running before the carb swap? Did you make any timing or dwell adjustments along with the swap? If yes to the first and no to the second, it's all in your carb. A carb change only will have no effect on your spark timing.
 
Quote from sii73 - I made no adjustments and my truck ran fine with a one barrel 1940 the timing wasnt off the point gap might have been cause I cant find the gap for the 258 but still ran. Pulled the 2300 off a travellall that ran. Someone told me that the timing May need to be adjusted going from a one barrel to a two barrel

I went ahead and c/p'd this from the pm you sent me. Might as well just keep it public rather than private so that others can chime in with suggestions and maybe someone else can learn something too.

You're having a fuel delivery issue or possibly a vacuum issue. Adjusting the timing is not going to solve it. That 2300 was jetted and tuned to run on an IH v8 engine. As such, it May not be a simple plug and play setup for your amc mill. As I'm not familiar with those motors, I don't know what the fuel delivery demands are for them, but someone like Mike mayben will probably be able to shed more light.
 
scouttwo73 said:
I have a 258 in a 73 Scout 2 it had a Holley 1940. I got an adapter to put a Holley 2300 and put the carb on and it starts and runs for a second and dies and backfires out of the carb. Does it need to be retimed? Is there any other things that can make it backfire like that?
Click to expand...

If the carb is in good working order it should be close and especially be able to idle after a mixture adjustment.

I don't know what adapter you are using but make sure all gaskets are sealing properly and that you don't have a vacuum leak.


Definitely verify fuel delivery pressure and quantity.
 
You must log in or register to reply here.
Back
Top