NEWS PARTS JEEP & 4x4 ATV & UTV

Re: 258 blocks

285 Views 2 Replies 2 Participants Last post by GeeAea, Jan 11, 2000

Discussion Starter · Jan 11, 2000

Re: 258 blocks

Are all AMC 258 short blocks the same? I know that the heads changed in 1981, but are they different except for the valve cover? I want to build a 258 engine with the 4.0 head and was wondering if certain 258 blocks are more desirable than others to build on. I know where I can get a early 70s 258 engine from a Gremlin cheap. Is this lowerend as good as any other? Thanks for any help.

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CJ7Taz

· #2 · Jan 11, 2000

Re: 258 blocks

I replaced an '80 with an '83 that I rebuilt. The '80 had 1/2" head studs, the '83 had 7/16". As far as the
lower end, I think they all had seven main bearings.

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GeeAea

· #3 · Jan 11, 2000

Re: 258 blocks

You might want to check out here http://www.monsterslayer.com/jeep/ .......I'm not sure that it covers the block end of things......but it's a pretty thorough write up on the 4.0 head convertion. It's my understanding that the blocks are virtually identical with the exception of motor mount and oil filter locations.

GeeAea

Figures don't lie ....... but liars sure do figure.

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