68 383 with 750 carb. Runs rich

I'm new to all this. But during replacement of my exhaust system, I had a bung welded into each header collector. And added an AFR sensor and gauge. Now I can tune like a ****. I don't know how anyone having tuning issues can live without an AFR gauge. The ole Scamp, while not a big monster power machine, runs like a top. A cool local auto / hot rod type of shop did an alignment on the ole Scamp. When I got it back they said, "that ole Scamp sure runs good." They had to drive it to confirm the alignment.

Prior to the AFR gauge and new exhaust, I always thought I was flooding the 360 when starting. Turns out, I was never giving it any fuel. It would take me forever to get it to start, it could be very frustrating. I would rarely pump the throttle after an initial pump or 2 because I assumed I was flooding it (this was with the rusted out previous exhaust system). It acted and smelled just like it was flooded.

After being able to see what's going on with the AFR gauge, I wasn't flooding it at all. I was starving it. And now I can tell that the first few pumps (after sitting for a few days) are not really doing anything but priming the pump well area of the carb.

There's one thing I can tell ya … an LA 360 likes fuel. I didn't read all the replies but I realize you're running a 383. But if it is at all possible, get an AFR gauge running on your set up … you will NEVER regret it. I believe you when you say it is rich. But how rich? How do you know it's good, when it's "good?" :D

One of the cool things is that WOT is easier to tune, than is just cruising and normal accelerating. I've got the ole Scamp hitting and hovering right at 12.2 AFR at WOT. So, even though it's not a power king, it's doing all it can do when it's at WOT. All I can get out of it, and safe. I can't express how awesome an AFR gauge is.


7milesout