Is the 232 block the same as a 258 block?

[gp_frk]

I have a line on 232 engine fairly cheap and was told that the only difference there was in the two blocks is the stroke is different. Can anybody validate this for me? It would be greatly apreciated.

[Crazy_Jeepman]

232 Bore 3.75" x Stroke 3.50"

258 Bore 3.75" x Stroke 3.90"

[gp_frk]

Any body got any thoughts on this

[Cecil14]

The blocks should be the same. The crank and rods are the only differences I know of.

Anthony

[gp_frk]

So if I stroke a 232 it equals a 258 then correct?

Also would the heads match up on the blocks?

[ January 17, 2003, 02:59 PM: Message edited by: gp_frk ]

[Cecil14]

yup. You would use a 258 crank and 258 rods and you'd have a 258. That's how they made it actually. Same thing they did when they went from the 290/343/390 to the 304/360/401s. They just gave them longer strokes to make more cubes.

Anthony

[ January 17, 2003, 02:59 PM: Message edited by: Cecil14 ]

[Cecil14]

Heads should be identical for the same era/year motors. They changed them in I think '80 or '81...

Anthony

[gp_frk]

thanks anthony it was 80 i beleive

[FSJeeper]

What he is trying to do is use a 232 bare block as a core to rebuild his 258 at the shop with a cracked block. I used to run AMC 6's and if I remember correctly, the blocks are the same, the parts will interchange. The thing I remember was the the 232 head was crap and the 258 head was a major upgrade.

So, anyone know for sure if he can use a bare 232 block in good shape for his 258 rebuild?

[gp_frk]

uh yeah what Da Man said... :D

[RustyJeep]

From everything I have ever read...yes

[gp_frk]

What has to be done to lengthen the stroke on the engine? Or do the parts just bolt in?

[ January 17, 2003, 03:33 PM: Message edited by: gp_frk ]

[mdill]

"yup. You would use a 258 crank and 258 rods and you'd have a 258. That's how they
made it actually. Same thing they did when they went from the 290/343/390 to the
304/360/401s. They just gave them longer strokes to make more cubes"

304 small bore
360 big bore same stroke as 304
401 bigger bore biger stroke.

304 - 360 shared crank, different blocks

401 all different.

Mike D.

[jeepsr4ever]

a 290 crank and rods are wayy different from a 401 the main sizes ARENT the same, the rods are forged in a 401 and the crank, the rods from a 290 would grenade in a 401, remember that each amc v8 uses a different balance so the cranks are not the same but can be used if machined, and the 304 360 cranks arent identical either they are balanced for the rods and pistons to each respective engine, but their are alot of myths out there, like a friend of mine told me YUP YOU CAN PUT 401 HEADS ON A 290 AND MAKE A STROKER....what a joke man........ smile.gif

[PAJEEPER]

Only difrence in heads I know of is early 232's had shaft mounted rockers instead of the 258 style bridged ones. I actually liked my 232 better than my 258 when I had my 6 powered FSJ's. The 232 seemed to rev up quicker due to the shorter stroke. The 258 seemed like a slug but it was very tired so who knows.

[Cecil14]

I wasn't trying to say that the V8s used the same parts guys. I said they stroked them. All they did was take the 290/343/390 and give EACH of them a longer stroke to make their later counterparts. No, the separate V8s don't share parts but the concept is the same.

As for making the 232 a 258 just use the 258 crank and rods and whatever pistons you need. If you have to bore it get bigger pistons. If not use stock 258 pistons.

Anthony

[Panther]

Gary,
Is the 232 the other block you have or is this another one?
Sounds like a good way to go, use the 232 block with the 258 crank.
I'll just be glad when it's FINALLY FINISHED :D :D :D
You patience is to be commended though my friend.
Lee

[thejum57]

My 76 J-10 had a 258/6 when I bought it. It was junk, I replaced it with a "crate" engine. The guy asked if it was a 232, or a 258. He said they are basicly the same, just a bigger bore...not that Jeep motors are boring. I wish I knew that before he had the old 258, because I have a 232 I would have givin him for the core, and kept the old 258! Jim

[FSJeeper]

Come on guys,

The 232 and 258 have the same bore and the reciprocating assemblies will exchange. Is there any other reason this won't work for one of our club members?

If it will work, I will buy the 232 long block for our dedicated member. This guy has a sweet j-20 and lets get him going.

[gp_frk]

btt any body else got any insight as to the negatives attributes of a 232 block. Panther thanks for the props. But my patience is wearing thin. Not goin anywhere but I'd really like to drive this thing before the first anniversary of buying it.

[gp_frk]

btt FSJeeper check your PM's

[gp_frk]

well as of right now it looks like they found me a usable 258 block