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All 2.9s are the same, there were no "hot" versions as far as I know. I do believe the 88 (or 89?) and later engines had slightly thicker heads, and were a bit more resistant to cracking.
The only "hot" factory 2.9s were in Europe. Base 2.9 had 20HP more then the US version, and Ford even had a special 2.9 with DOHC 24 valve heads in Europe.
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- Ian
1987 Ford Ranger XLT 4x4 2.9
Needs a lot of work, including some rot on the body, but shes getting there.
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