@Piotrsko yeh it's possible, however, to do tranny swap to T50, W50, W56, and W58 variants. Adapters are not readily available, but its not impossible to fabricate one. However, space is limited. The distance between the handbrake lever and gearbox stick is rather too close for my liking. So, instead of going through the hassles that will later become burdensome, I sticked with the speed gear that I currently have.
Also, when I send the head for valve boss guide shaving, I make sure that the machinists did "valve bowl blending work" (pocket porting) on both IN/EX sides. The purpose is to limit turbulence, improve the A/F mixture quality and increase mixture flowrate entering and leaving the cylinder. The net result is a increased usable torque at lower rpm, which in turn increases fuel economy and "slightly" lowers emissions.
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