258 vs 232 6 cylinder

What was the difference between the 258 and the 232 6 cylinder jeeps?

anything significant?

 

just displacement as far as I know..

BUBBA

 

Stroke. Different rods. Different crank. The same otherwise.

 

BTW prior to 1971 there was no 258, but there was a 232 (as well as a 199). That 232 is different from the 258, since it has a different bellhousing pattern and a different deck height. In 1971, Jeep unified the bell pattern between their small block V8s and the I6s, and discontinued the 199. The deck height also changed, and the 199 rod became the 232 rod, while the 232 rod became the 258 rod.

Probably more than you wanted to know

 

thanks

 

Tim, I never knew all that, were did you learn that at? A prior to 71 232 rod will work in a 72 and later 258? That simple? Just asking out of curiousity. Learn something new everyday, got this day done early!!

 

bout 10~15 HP and 30ft lbs of torque stock.

 

I think the observation about the deck heights and rod lengths came from D1ck Datson's AMC performance book. The 199 used a 6.125" rod, and the early 232 used a 5.875" rod. This makes sense, since the stroke for the two engines is 3" and 3.5" respectively. The 258 has a 3.895" stroke, which isn't as nicely symmetric as the 199-232 difference, but may still be ok with the right piston design. I'll have to check what I remember.

The old 232 has been discussed a few times on IFSJA, and is important to owners of 232 FSJs (66-70). Some of them imagine they can easily drop in a 258, which they cannot.

 

The old 232 has been discussed a few times on IFSJA, and is important to owners of 232 FSJs (66-70). Some of them imagine they can easily drop in a 258, which they cannot.[/QUOTE]

I also did not know that. Interesting.