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Unread 03-14-2012, 11:48 PM   #1
JeepJesus01
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Engine Size

Is there a relatively easy way to find what size my engine is?

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Unread 03-15-2012, 12:03 AM   #2
BagusJeep
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You believe you have an AMC304 V8. I take it you have no reason to believe it is not a V8 so is the question about checking the capacity it was made with or the capacity it is now?

I believe, and someone can correct me if wrong, that it is on the side of the block near the engine mount, says 304 or 360 or whatever. From 304 to 401 they all were made from the same block casting, there is no small or big block in an AMC (too tight fisted maybe).

The engine number is on the front top right near the end of the valve cover. I beleive this is a sequenetial number.

If you can find the engine identification it should be something like 212H05 The 2 would be 1982, the 12 would be December and H a 304ci. the 05 would be the 5th day of the month.

If you want to check the VIN it should start something like IJCHM>>>>>>. The H is for the 304.

If you check all this and you are finding that H in the engine serial number than you had a 304 originally.

If you REALLY want to know then you will have to take the head off and measure.
engineblockdsside.jpg   engineblockid3.jpg  
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Unread 03-15-2012, 07:36 AM   #3
mopar408
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look between the two front freeze plugs on all V-8's.......[IMG][/IMG]
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Unread 03-16-2012, 01:44 PM   #4
JeepJesus01
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Alright I'll look at it, thanks. And the only thing I'm worried about is because right on the top of the grill it says it's a 258 but the guy I bought it off of said it was a 304.
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Unread 03-16-2012, 02:00 PM   #5
hp_lovecraft
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Its a pretty easy swap, so its not uncommon. I've had many Jeeps over the years, and NONE came with its original engine.
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Unread 03-16-2012, 04:00 PM   #6
Cherokeester
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Ummmm.. 258 is an inline 6, 304 is a v8 you should probably be able to tell the difference.
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Unread 03-16-2012, 06:23 PM   #7
mopar346
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Quote:
Originally Posted by mopar408 View Post
look between the two front freeze plugs on all V-8's.......[IMG][/IMG]
JUst to clarify my brother's statement all AMC V8s. Mopars small blocks are in the rear (shown here), the rest to my knowledge do not have the displacement cast into the block.
copy-0718001701.jpg  
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Unread 03-17-2012, 01:54 AM   #8
hutch1200
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Split the difference...it's a 281!
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Unread 03-20-2012, 10:43 AM   #9
JeepJesus01
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Yeah well I'm only 16 and just got my jeep 2 months ago so I'm new to this and my dad is out of town so that's why I'm asking here.
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Unread 03-20-2012, 11:39 AM   #10
1986cj
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Check out the spark plugs wires. Do you have 6 on one side? or 4 on one side and 4 on the other side? I think 1981 was the last year for a 304 in a CJ but anything could be swaped in.
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Unread 03-20-2012, 01:21 PM   #11
CSP
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AMC V8


AMC Inline six cylinder (258)
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Unread 03-20-2012, 06:07 PM   #12
JeepJesus01
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Haha thanks a lot man, the photos really helped. There's a huge difference between the two! Im just glad it's a 304 lol.
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Unread 03-20-2012, 06:11 PM   #13
mopar346
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Once again, I prove I'm shameless. Mine's purdier.
dscn2140.jpg  
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Unread 03-22-2012, 10:12 AM   #14
JeepJesus01
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Yup it defiantly is! Haha
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