Good numbers! Time for me to invest in an LQ4

You have data from the run(s) with the Proform ?

looks like my 550 hp guess was very close.you did loose some weight from the bilge.

One thing about the stock, car engines, is they have an engine management system. My 6.4L hemi is 10.9:1 stock. It also is very sensitive to octane, air temperature, fuel mixture etc. Could see some short term knock retard just from going from one gas stations 93 to another brand. It runs great, thanks to a modern engine management system that as many failsafes working nonstop to prevent detonation. Basically, they run it on the edge from the factory , and "tuning" doesnt do a whole lot for them. The engines run near peak performance thanks to all those sensors.

That beIng said, prob not where id want to be with a carburetor setup and basic ignition setup. I don't think 11:1 compression is "mild" by any means, for a pump gas boat engine. Id say its a bit closer to borderline , and a bad tank of gas away from knocking itself to death. LS or not, detonation doesnt care what you name the engine. Id keep a close on that tune . What kind of egts were you seeing from cyl to cyl?