One of the most popular swaps we see is LS.... I guess its the norm now, LOL. I have been toying with grinding a cam to fit the LQ4, LQ9 and LM7. Something to push the stock heads to the limit. After some parts gathering and way to much math, I found the end of the heads but made some nice power out of a CHEAP engine.
We started with a 125k mile LQ4 6.0. Checked it over and decided it was healthy enough to run. I have a stock dyno sheet shown for reference on what this engine should make stock. The other sheet has Pull 3 and Pull 5.
36 lb injectors
LS2 yellow valve springs
Same as above
My baby cam, springs, push rods.
At the end of the day we ended up with an engine that was 460/460. Not bad for a 300 hp stock engine with no real major upgrades. The most awesome thing was the power this thing made in Pull 3 with little upgrades.
I did grind a larger cam for a ported cathedral port head engine and we did test it with non ported heads..... It fell under pull 5 until 5k then it ran out of air and fell flat. All the heads we ran were 317s and 243/799s. Even the slight compression bump wasn't an improvement worth noting.