What is your a/f ratio wide open?

i have a 8cyl egt and they r in the 1100 range

No O2 sensor in the collector?

no just egt probes

An o2 sensor would be nice. Most boat guys don't run egt probess except on the dyno due to water jacketed exhaust. But if you are blowing flames out the exhaust something else is wrong. Is the blower swap the only thing you did from running good to flames out the exhaust?

the exhaust is 24 inch long individual pipe zoomies i switched from 6-71 with 2 750 holley to 14-71 with 3- 750 thinking the 14 would need more cfm do u think i should add o2 to end of one pipe? thx for help

It would sure help. I don't understand if you are blowing flames out the pipes why the egts aren't off the charts high.

thats what has me confused it idlea good and sounds good just acts like it never cleans out down track looking at o2 sensors now

I'd say you have something else going on like weak/broken valve springs. I use the Innovate LM2 af meter which per my research is the most accurate.

The flames in the pipes is raw fuel burning . I'll bet if you check the oil it will be loaded with gas. It's acting like it won't clean out because it won't . You are putting way to much fuel in it and it's just blowing the fuel out the exhaust .