I finally managed to get my 24 yr old mini mac to fire up and found some pics that may or may not be of interest. The port surface on the original looked nasty. Their ubeaut port borer must have gotten a bit wonky. Any way I cleaned them up and matched the to the green injector TB’s off something with the slightly next size up.
The TB’s themselves had the transition ramps elongated and angle reduced. ( conical ring above the throttle plate in pic) the result was an extremely touchy quick action affair, right on the edge of that’s too responsive. (No sneezing in corners 😄)
748 drop cam heads require change to ST4 belts.
Also standard 851 1990 header and ST4. One does work better than the other. 😄
