Blew through 1600 miles of steep grades and hard highway running for the M&G 3 weeks ago and not a sign of a ping or knock. What I DO hear from time to time at lower RPM
is a little piston slap noise, but again, 4 1/2 inch stroke. Thatís a buttload of dwell angle on the crank, and these pistons arenít exactly useful as shop ashtrays for the skirt length. They canít be, because they have to clear some giant counterweights on that 42 pound crank. At 72K I dropped the bore scope into my cylinders for a peek and all is golden (an expression, not a color!) inside the cylinders. If you are actually pinging, something is off.
, a 42 flat slide wonít make even one more foot pound of torque come out of your motor and will in fact be less than ideal for frequent altitude changes. The CV carb
is self compensating for altitude by virtue of differential pressure actuation.