6 Pack Issues...
Hey guys,
I need to pick your brains and beat another dead horse. I have a 340-6 pack that is an absolute fresh build, just ten years old. 372 ci, edelbrock heads, 10.25 Weisco pistons, ,530 Hyd Roller, MP 6-pack and ignition. Other than the dyno break in, I have just now started running the engine some since my car is almost finished. Other than running just a tad rich (carbs are out of the box and not adjusted properly) I had noticed that the accelerator pump had started leaking, probably dried out over time, so I decided to go ahead and change it and the front bowl gasket just to be safe. After all was said and done, I cranked it this afternoon and the choke engaged as should but the idle was higher than usual. I rapped the throttle to release the choke and it backfired from the rear carb. After checking, I had left a vacuum hose off. I reconnected it and fired it up again, it immediately started loading up and I noticed that when I put my hand over the air horn of the front carb, no problem, but when I put my hand close to the air horn of the rear carb, it would suck my hand quickly. Could it be that it busted the power valve on the rear carb when it backfired causing the excess vacuum and running rich on fuel? PS the picture is not today, it was a while back.
Martin
Hey guys,
I need to pick your brains and beat another dead horse. I have a 340-6 pack that is an absolute fresh build, just ten years old. 372 ci, edelbrock heads, 10.25 Weisco pistons, ,530 Hyd Roller, MP 6-pack and ignition. Other than the dyno break in, I have just now started running the engine some since my car is almost finished. Other than running just a tad rich (carbs are out of the box and not adjusted properly) I had noticed that the accelerator pump had started leaking, probably dried out over time, so I decided to go ahead and change it and the front bowl gasket just to be safe. After all was said and done, I cranked it this afternoon and the choke engaged as should but the idle was higher than usual. I rapped the throttle to release the choke and it backfired from the rear carb. After checking, I had left a vacuum hose off. I reconnected it and fired it up again, it immediately started loading up and I noticed that when I put my hand over the air horn of the front carb, no problem, but when I put my hand close to the air horn of the rear carb, it would suck my hand quickly. Could it be that it busted the power valve on the rear carb when it backfired causing the excess vacuum and running rich on fuel? PS the picture is not today, it was a while back.
Martin
