...powervalve linkage is only mechanically able to lift the valve..
Right, but the powervalve mods that are done in conjunction with the big bore kit only involve cutting the valves so that they don't potrude into the cylinder and hit the piston; I think it would be hard to modify the valve to lift higher than it does in stock condition, based on how the job is done, but maybe worth looking into in the future. Regardless, it seems that the powervalve probably isn't the problem.All that (flapper fit etc.) is something that is advertised as being massaged as part of the big bore process.
Still laughing about that one!HHmm...'strength of materials' study. Anything over 5.0 is usually pretty good, tending toward a strong #1 hop (bittering). Watch your AAU% cuz this year's crop is a bit on the low side (chinook going from 17% to 10.8%!)
Not running race fuel isn't really what I meant: I would love to have the money and supplier to run race fuel all the time, but it's just not practical. What I meant was I wouldn't use an octane booster unless I absolutely had to; there are quite a few threads on why octane booster isn't good and race gas is, so I won't go into the reasons here. That said, it might still be a good test to try octane booster to see if it solves the problem (race gas would be even better); but I think it is important to make sure your jetting isn't too lean first. Race gas would probably prefer leaner jetting anyway, but I don't think octane booster would.I have no desire to run race fuel either, only thought it would be a good test.
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