SGTJHALL Posted October 20, 2011 Posted October 20, 2011 Looking for: 258 Rods 258 Crankshaft I have looked every where for these and they have been selling on Ebay for extremely expensive of late. No junkyards in my area even carry motors this old, so anybody that can help please let me know thanks
hick92 Posted October 21, 2011 Posted October 21, 2011 i wish i new that i could use them for a stroker
Geonovast Posted October 21, 2011 Posted October 21, 2011 258 was used in the YJ up through 1990. They have the snout already machined for a serpentine belt too.
Geonovast Posted October 21, 2011 Posted October 21, 2011 The older 258 cranks will work, but the snout has to be machined down to fit the harmonic balancer for the serpentine belt. Also, there are lightweight and heavyweight 258 cranks. I'm not sure what vehicles had which, or which one is better for the stroker.
Geonovast Posted October 21, 2011 Posted October 21, 2011 nevermind that sounds like it will cost alot Machining that snout would be an incredibly small percentage of the money that should be spent on a stroker. Stroking a 4.0 is something you don't do cheaply or half-assedly if you expect it to last any amount of time, or even work.
hick92 Posted October 21, 2011 Posted October 21, 2011 okay cause my cousin has a old 285 that just lost compression
SGTJHALL Posted October 21, 2011 Author Posted October 21, 2011 I have heard that some later models like 87-90 have a 258 crank that the snout is already shortened and will fit the 4.0 without any issues, is this true? Also the weight is different on these crankshaft, will that mater when building my stroker. I also was wondering if all the 87-90 cherokees had this same crank or only certain ones?
FrankTheDog Posted October 21, 2011 Posted October 21, 2011 87-90 XJ's are a 4.0 EFI. 87-90 YJ's are a carbed 4.2. You make a stroker by taking the crank out of the 4.2 and putting it into the 4.0. Plus a bunch of other work.
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