10.5:1 Pistons for '66 273 Block w/ '67 920 Heads

/6 for webers or SU? Just make your own. Get some flanges off Ebay and some 1.5" pipe and start welding. The runner length will be whatever fits, the shorter the better for I.R. style intakes. You can buy intakes from Oz or specialty retailers but the cost is unreasonable plus the cost of the side draft webers, might as well EFI it from parts off a M series BMW with its I.R throttle bores. There is a guy somehwere here or .org that has 6 Mikunis off a slant, says the pedal is pretty heavy with 6 return springs. I think Argentina had an intake that used 6 Briggs and Stratton lawnmower carbs (no kidding!) something about using in country parts for a racing class.