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Actually VW retarded spark to #3 on most distributors'(I would say all but I'm not certain). I don't know why #3 runs hotter on all VW engines but the only engines that send hot air from the oil cooler to cylinders 3 and 4 are Pre 71 types 1 and 2. This is why it's important That you don't switch the plug wire positions to make a retrofited distributor work. Move the distributor drive gear instead. The late bus ignition you refer to is my favorite system. I believe this only came stock in California. Luckily I live there and raid Wrecking yards for them. All of them are over 20 years old and they usually work perfectly. How many people do you know who have run an aftermarket electronic igition for 20+ years? Another bonus is that many spare parts can be found on jettas, golfs ect. As for the 010, 019, 009 issue my understanding is that the 010 was being sold as a performance part when bosch changed the design of their distributors. The 009 superceeds the 010 and has a similar advance curve. In the early 70's Bosch changed the design of all of their VW distributors Exept those for cars with D-jet fuel injection. My guess is It was a cost cutting move as the quality of the early distributors is exellent. Everything from the case to the cap and rotor to the advance mechanism is different. I always thought The 019 was designed with the slow advance to match a 36 hp bus. I thought the 010 was a porsche distributor, But if they were to make a faster advance for the bus 60 may have been a good year as the 40 horse became standard and I believe the 1500 option became available. Hopefully this info will be of some use or interest or use to some of you. Josh Brooks ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org