thejim42 Posted December 14, 2015 Share Posted December 14, 2015 have an extra motor that needs to be rebuilt sitting on my garage floor and was doing some research on what kinds of things i can do to it. Does anyone have any information on using the 4.2 crank and rods in a 4.0. from what ive read it strokes the engine to a 4.5 or 4.6. Has anyone done this? Was planning on get a master rebuild kit with new pistons, having the block bored .030 over, and getting a new crank and cam anyway. Link to comment Share on other sites More sharing options...
cruiser54 Posted December 14, 2015 Share Posted December 14, 2015 Dino Sava has a great site covering all of this. Google "poor man's stroker". Link to comment Share on other sites More sharing options...
HOrnbrod Posted December 14, 2015 Share Posted December 14, 2015 Start reading HERE in the FAQS section. All you need to know. Link to comment Share on other sites More sharing options...
Eagle Posted December 14, 2015 Share Posted December 14, 2015 Many, many people have done this. What you need to be aware of is that there is a slight difference in deck height between the 4.0L and 4.2L engines. If you do the "budget stroker" using stock 4.2L connecting rods, using OEM replacement pistons results in a bump in compression ratio that usually causes detonation problems. At least one of the companies that sold shop-built stroker engines used 4.0L rods with custom pistons. Other people deal with it by doing things like polishing and enlarging the combustion chambers in the head, and running a cam with enough overlap to effectively lower the compression. I remember at least one person who ran two head gaskets to decrease the compression -- but I don't recall how long that held together. By all means, spend a lot of time reading Dino's web site. Zero in on discussions of "quench." Link to comment Share on other sites More sharing options...
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