258 Rods for stroker

jimmydaux · May 1, 2009

Ive been looking at starting my stockpile of stroker parts. I remember being able to find reconditioned connecting rods on ebay that have been weight matched and such but cant find those anymore. Do any of you know a good source to get rods as a set for a decent price?

Would I be ok using ones out of an old engine that aren't "reconditioned?"

userbmx1315 · May 1, 2009

you get ones out of a motor and have them straitened and shotpeened (sp)

jimmydaux · May 3, 2009

Is that the best route to go for rods? Cheapest?

RCP Phx · May 3, 2009

http://www.hesco.us/

wolfpackjeeper · May 3, 2009

I got mine off of ebay because I lucked out and found them ready to go. You can get used rods out of a running motor and just shotpeen, and re-machine them. Then destress and heat treat or cryo treat them and be good to go.

hot_rod_hooligans · May 3, 2009

jimmydaux said:
Is that the best route to go for rods? Cheapest?

Not really, the 4,0 rods are a better choice.

whitneyj · May 3, 2009

they are a better choice but require a considerable amount of more machine work to get them to work

wolfpackjeeper · May 3, 2009

my 258 rods are working just fine.

jimmydaux · May 4, 2009

Dont I have to have custom pistons made to make the 4.0 rods work? I dont think ill have too hard a time sourcing 258 for the crank and rods. Is it better to just buy a reman crank from a local autoparts place, or have the 258 crank ground and balanced?

If I come accross a 258 somewhere, what are some things to look for that wont be corrected by normal rebuild machine work? If a rod spins a bearing, does that cause irreparable damage?

Talyn · May 4, 2009

You don't need custom pistons for the 4.0L rod on the 258 crank. Keith Black makes forged pistons for this application. KB944 or KB945 depending on your desired compression.

As for the 258 rods, used will be fine.. shot peen them and polish them if you like. Installation of ARP rod bolts is also a good idea.

whitneyj said:
they are a better choice but require a considerable amount of more machine work to get them to work

huh?

jimmydaux · May 4, 2009

If the stock Jeep 4.0L 6.125" rods are used, expensive custom forged pistons with a shorter pin height than stock (1.380") are required to achieve zero deck clearance.

Thats from http://www.ajeepthing.com/stroker-motor.html

That would be awesome to be able to use my existing rods! You may have opened my eyes to the light talyn

jimmydaux · May 4, 2009

Holy Hell theyre expensive,,, Im leaning towards closing my eyes to the light again

seanyb505 · May 4, 2009

Yeah the info from Dynos site has been there for a couple years, the new KB piston has been on the market for about 6mos it seems. Keep in mind if you get new ARP bolts youll need to get them reconditioned, as the process will make them slightly out of round.

Talyn · May 4, 2009

seanyb505 said:
Yeah the info from Dynos site has been there for a couple years, the new KB piston has been on the market for about 6mos it seems. Keep in mind if you get new ARP bolts youll need to get them reconditioned, as the process will make them slightly out of round.

Yeah, you can't just slap the ARP rod bolts in, you will also have to have the rods resized. Should run about $70 for the resize

Also, where are you getting your prices from? Some places have them listed as 8 pistons, and you can also get the kit which includes rings and pins.

258 Rods for stroker

jimmydaux

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userbmx1315

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