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I don't know for sure about the "lead" question for the valves. On the recommendations of others, can't recall whom, I ordered the RedLine lead substitute from Summit (or was it Jeg's), and did use it. The valve seats are of '40's standards, and may be more protected with "lead". I just had...

There is about a four inch extension rod that attaches to the pinch weld tiny hole, the other end to the near end of the throttle spring. Otherwise, the spring is way too stretched. You can make one out of coat hanger wire. On my truck, the stock location of the spring/tiny "rod" had some...

After a six month engine removal, tear down, then three months at a machine shop with virtually all new internals, I put the motor back together with the guidance of the TM's, help on this and other forums, phone calls to M 37 experts, and after hundreds of hours of work, making all new lines...