Laptom Posted August 6, 2013 Share Posted August 6, 2013 Hi, I have 2 3.9 blocks sitting around. Just got me thinking I've got a 4.2 crank, but no connection rods (piston rods) for the 4.2. Are the 3.9 piston rods & pistons the same as for the 4,2? That is what I have heard, but is this true? Thanks Quote Link to comment Share on other sites More sharing options...
Landrovernuts Posted August 6, 2013 Share Posted August 6, 2013 Hi - Rods are the same, but pistons are different. I have heard of 3.9 pistons having some material removed from the crowns to be fitted in a 4.2, but unsure how long they last when this is done. Toby Quote Link to comment Share on other sites More sharing options...
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