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Old 03-28-2008, 08:05 PM   #1
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stroking a 4.0...... input wanted

just as the title says, i'm getting a 4.0 and stroking it to repolace my ragged out old 4.0. the plan is is actually to get an old used motor, stroke it, replace mine with it (to minimize downtime) then rebuild the one i pull out of mine and sell it to try and make some of my money back. but thats got nothing to do with this thread..... what i'm lookin for is any and all hints, tips, advice, ideas, any input you have i'll take. thanks guys

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Old 03-28-2008, 09:24 PM   #2
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too much information to go on about. there's a handful of us here doing this, but no one is done yet. tell us where you need to start. i imagine you know you need to get crank and rods from 258 4.2L jeep motor. pretty straight forward fit. if your runnin 4.0 now 258 crankshaft is a little longer, can be machined down, or i think someone said something about spacers. you'll need higher flow injectors, mustang 5.0 injectors seem to be a common choice. only a couple choices in cam shafts, so thats not too dificult. let us know what specifics you need

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Old 03-29-2008, 09:57 PM   #3
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i've been doing a little reading and seems that just buy changing the crank and rods froma 4.2L i'll get a 4.5L, bore 30 over will make it 4.6L, and 60 over becomes 4.7L... will any stroker cuase me to have to use premium fuel? with gas prices i want to stick with regular gas. to my understanding its the compression ratio that makes that decision not the displacement.
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Old 03-29-2008, 10:05 PM   #4
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i don't think i've heard of one that will run WELL, on less than premo. i've heard of people getting lucky and no knocks, and others getting knocks in same setup. and i agree about compression, that's the issue. the cylinder bore just changes the displacement nothing about compression. there might be combos that make the quench height and all acceptable for less than premo, let me know what you find there.
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Old 03-29-2008, 10:16 PM   #5
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i'll do that. what era 258 crank should i look for, i think i heard something about 60's-70's have more weights on them that make them balance better and run smoother, this true?
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Old 03-29-2008, 10:34 PM   #6
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correction, looks like the 72-80 era crankchafts are the desired ones bc they have 12 counterweights compared to 4

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