I've been worrying about this harmonic balancing question ever since I'v gotten back on the road with my 62 TR4. I like to drive the car but see no need to wind it past 4 grand or so. Is it really the case that the crank extention serves as a harmonic balancer on the stock setup? I can find no referance to this in shop manuals. Also, I have a question regarding fans. Has anyone ever installed an after market flex type fan on the TR4? I would really like to get rid of the stock fan. It strikes me as a totaly over enginered inefficient relic from the past. Thanks KSD