John Bange wrote: > I think the only changes between the 1.9 head and the 2.1 were > structural. According to the Pro Training Manual, the 2.1 simply has a > 7mm longer stroke (94mm piston, so 4.7 * 4.7 * pi * .7cm * 4 cyl = > .195 liters). Toward the bottom of the page in the following link, Ken Lewis talks about the effect on Compression Ratios Using 1.9L Heads on a 2.1L Engine. http://neksiwel.20m.com/custom.html Seven years ago I bought a new AMC 1.9 head but they've since become NLA. 2.1 heads will work on a 1.9 but offer a slightly lower compression ratio. Mike |
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