I'm striking out finding anyone running an engine dyno in mid-atlantic with availability. Have two rather mild LS motors with Holley EFI to run and at this point I'll crate one and send it out, to where ever.

Maybe PM artcifriends on here.
See what he can do for ya if anything.

I'll have to work on getting my post count up because at the moment I'm not cool enough to PM anyone.

I think 10 is the magic number.

Looks like it's my lucky day

Are these going in a boat? What size, etc. Be interesting if it is. Always wanted a couple LS's to try due to sheer weight savings and more room in the compartment. Weight make so much difference in the feel of a boat. Be like getting rid of 3 peeps on the back!!

Let us know what happens if its in a boat.

After going back and forth with Smitty, these motors want a lot of PE and little timing at high load to keep from rattling. I'll burn 250 gallons per trip and restrict myself to 87. Something I should have done before now is take a peak at GM calibrations. On the 6.2, lamda in PE starts at .82 @ 3000, drops to .76 @ 4000+. There are a lot of single digit values on the low-octane maps at high load. It seems that with a low compression engine, one can expect 1 hp/cube with a high load factor scenario such as a boat. This is a 415 and I don't think that is going to cut it for me. I used the aluminum GM block here and it's 635 pounds wet--it is light.

It was fun piecing this motor together but I'm going to shelf this and go with big blocks

From most of the research I have done if you want decent power for a go fast boat and a LS/LT motor you need to Boost it.

Than you get into NA BBC power levels and more. Its hard to overcome the displacement loss.