Connecting rod pics

[dwg86]

These are the connecting rods I removed from a 2000 4.0, compared to the 258 rod. It looks like the 258 rods would be stronger. Notice the extra gussets at the big and small end of the 258 rods.

[dwg86]

more pics

[Alex22]

The 4.2 rod is already nicely polished to remove stress risers. The 4.0 rod looks strong enough, remember that these engines don't produce a whole lot of HP or reach high rpms (over 5500)

~Alex

[TurboTom]

i will be running stock 4.0 rods on my boosted motor... until the Internals become Externals

[Mgardiner1]

... until the Internals become Externals

[Alex22]

A properly prepped set of connecting rods should be able to hold up to a decent amount of HP. Polish, shot peen, nitride, install ARP or equivalent hardware and re-size. But when they let go they make some expensive paperweights.

~Alex