The 260 horse 350 has a specified range of 4200-4600 but peaks at about 4400 on a dyno. What is the specified range for the 320efi, 5000-5400? I just meant that in real life on a dyno there probably isnt much gain from 5k to 5400 with that motor, maybe just a couple horse.
Be interesting to see what you find with the 21s

ok ill let you know maybe 2 weeks, boat is uncovered but still needs preseason, before going to the crooked. You on sebago?

I run mostly the kennebec and midcoast but have been to sebago

oh ok cool.

I have an 87 272 with the same 320efi engines but I am also running the AlphaSS drives so it's not a direct comparison. I am currently running a pair of 23 mirage and have no trouble spinning the motors above 5000 rpm. I'm actually looking for a pair of the mirage pluses to bring the rims down a bit and hopefully improve my slip some.

Have you checked your tachs to verify they are accurate? I have seen them off by as much as a few hundred rpm in the past. The reason I ask is your slip seems very low (which is great if it's accurate) but I wouldn't be surprised if your tachs are a bit off and your actually closer or slightly above 5000 rpm.

Oh. No
What would you recommend a method of checking the tachs?

Compare to tach on timing light.

Same method glenamy posted above. Get yourself a nice digital timing light with a tach output. Very useful tool.

Howdy, I thought you had 21's if I recall.. when you bought that boat last year? also didnt you junk the EFI? and go with carbs?

I have two tachs for each motor, I have the digital synchronizer and the VDO factory tachs they read the same... I just remembered
I will test with 21's soon a week from next sat. I did the full preseason yesterday finally.