well, it cant be the tank, i started with 1/2 tank, and ran it almost completly dry and didnt' have any low end loss untill i topped off the tank, adn got through 1/2 of that. so basicly, seams after about a full tank of run time, the engine gets hot, and starts to loose that low end power.
you can almost hear it struggle off the line. sounds rich, bogs and pops alot, but doens't stall.
also, on that 1st 10 mins of run time, 1/4 tank, whatever.. really ripped. once i noticed it started to bog down, and loose my low speed power, i topped off the tank, so it must be in the tune.
also, are these big block engines typically run for 1 tank full, before starting to get hot? is it best to give them a rest, or can you run tank after tank after tank?
after i let it cool down, 10 mins or so, start it back up.. 100% power again.
must be in the tune.. but can you run these big blocks 2 hours straight with respectable head temps?