I have never heard of a 4000 that used one so I'm hoping someone will give us a answer.
Plain piston for the 4000 and 3700. Chrome on the 3400 and if I'm not mistaken so is the 3800. If that 3400 piston kit I got from LRB had been plated, I'd probably be still running it, but it was all for the best when I got a 3700 top end with crank that was in perfect shape for around $35.00. But what I didn't like was when I sent them (LRB) a message they never answered me back. Lost my business and confidence in them supplying parts that are hard to get.
Steve
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