Lifeguard, My tests with lumps/ no lumps were on a dyno. That was with stock valve sizes and only the lump to modify anything. There was no power gain. Bigger valve and port work, then your talking. Power gain.
That's right, you mentioned no power gain with stock valves and lump, but you didn't have flow bench results for that combo, just dyno.
I know you guys want to sell lumps, but for those of us building a 250 for the street on a budget, what's the difference between a valve job with bosses on the stock valves versus 1.84/1.6 with valve job and bosses? Does the bigger valves make a difference with the bosses in place or are they they only useful once you remove the bosses and put the lumps in.
