Leaderboard

Mixing 28/28 and 28/32 is possible, but requires both lower and upper bodies. It also isn't an straight up bolt-on thing to do... I just assembled mine with 28/32 throats and butterflys and swapped the mechanical linkage so the secondary is also mechanical instead of the vacuum actuator. I used 170 secondary, 116 main, 51 idle and 60 size power valve. The venturis are also different in the 28/32 version. Don't know yet how this will run because the engine is still in parts. I had to modify the secondary shaft to adapt the bigger butterfly and also shorten it, because the carb body differs how the shaft is going through the other side. Had to make a fixture for the secondary return spring also. There's also no spot for the velocity flap in the secondary side in the bigger throat carb body, but at least the previous carb ran perfectly with the flap locked open all the time. Unfortunately it's winter time here in Finland, so can't test it out until late April. I did this upgrade since my 4K is being worked on. Honed, new pistons, 270deg cam with 10.5mm valve lift, 4-2-1 extractors, 11:1 compression to suit the cam, lightened flywheel, balanced everything, extensive head work done, pistons protruding block 0,3mm (~1mm quench clearance) etc.