258 Crank and Rods

[jimmydaux]

Would $100 for a 258 crank and set of rods out of a "tired" 258 that started smoking be a good deal? Id suspect the crank would need at least a polish and obviously new bearings all around. Ill be able to inspect before purchase to see if there are any spun bearings or anything.

What are the chances of being able to just throw new bearings in when I build my stroker rather than having a machine show do a run over? Am I just asking for trouble by taking that chance?

[1990JEEPXJ]

if you do buy them i would have a shop go over things.

[jimmydaux]

Is that a fair price considering cost of bearings and potential machine shop expenses?

[whitneyj]

I bought a complete and running 258 with everything on it for half that. I've seen ads for people giving them away. I wouldn't pay $100 for them.

[jimmydaux]

Haha and I thought I had found a good deal. Maybe ill lowball him. How much would you pay for them?

[Dundy]

i got a short block 258 and a set of 258 crank and rods for free...guy wanted to get rid of them...waiting for $$$ to stroke my 4.0.

[cal]

$100 is about the going rate for a good 4.2 crank, now that strokers are getting popular. You can get them for less, but its like waiting for that $300 xj... how long do you wait?

I wouldnt go thru the expense of doing a stroker and NOT get the crank ground and balanced.. but I also wouldnt do it with 4.2 rods and cast pistons.

When you can get custom forged pistons for under $500, there's no reason to half ass it.

[SBrad001]

$100 is about the going rate for a good 4.2 crank, now that strokers are getting popular. You can get them for less, but its like waiting for that $300 xj... how long do you wait?

I wouldnt go thru the expense of doing a stroker and NOT get the crank ground and balanced.. but I also wouldnt do it with 4.2 rods and cast pistons.

When you can get custom forged pistons for under $500, there's no reason to half ass it.

Cast pistons (tighter tolerance and less thermal expansion) are better for durability and longevity than forged (looser tolerances to accommodate thermal expansion). Why would you need forged if you're not running some outrageous cam, +10:1 compression and trying to pump out +300 hp?

[cal]

Cast pistons (tighter tolerance and less thermal expansion) are better for durability and longevity than forged (looser tolerances to accommodate thermal expansion). Why would you need forged if you're not running some outrageous cam, +10:1 compression and trying to pump out +300 hp?



The custom being the more important part of that than the forged, really, athough anyone who's going to the trouble to build a stroker is going to put their foot into it.


Lets reprhase the question then, why go through the trouble to build a stroker and still have ~.080 quench, requiring high octane gas and still pinging?

[Milford Cubicle II]

Cast pistons (tighter tolerance and less thermal expansion) are better for durability and longevity than forged (looser tolerances to accommodate thermal expansion). Why would you need forged if you're not running some outrageous cam, +10:1 compression and trying to pump out +300 hp?

Wait hold up... did I really just hear you say that cast pistons are more durable and reliable than forged pistons??? :confused1

[SBrad001]

Wait hold up... did I really just hear you say that cast pistons are more durable and reliable than forged pistons??? :confused1

Um, you heard me say that cast pistons are better for durability and longevity. If you stick forged pistons in anything other than a motor built for power and speed, you will decrease the life of the engine due to the engine wearing out (not by piston failure). Forged pistons cause faster wear in the cylinders because they need 'looser tolerances' to accommodate thermal expansion of the pistons (have you ever heard an engine with forged pistons? You can hear piston slap until they warm up.) Cast pistons do not expand as much and there for are fitted to tighter tolerances.

Are cast pistons as strong as forged? No, but they can increase the life expectancy of a typical engine.