Which 304? - JeepForum.com
 
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post #1 of 11 Old 07-30-2009, 01:55 PM Thread Starter
LazarusCJ7
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Which 304?

I have been reading up on 304's trying to get my ducks to line up. My Jeep is an 80 model, but during the cleaning, I uncovered a re-manufactured sticker and an emblem painted on the block (4-star Engine builders) I think. (It's hard to read now) I am not sure now if this is the original engine 1980 or if the 304 is the pre '80 version? I am going to replace all gaskets etc when I button it back up, and the gasket kits seem to be listed as 1966-1979 and 1980-81. How can I tell which 304 I got?

I can provide pics, but was just wondering if there were tell-tale markings?


Gary

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post #2 of 11 Old 07-30-2009, 02:00 PM
SlikRic
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I think the 304 was dropped as an option in 78 or 79, not available in 80. Someone will correct me if I'm wrong.

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post #3 of 11 Old 07-30-2009, 02:02 PM
Curt Reinhardt
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Was an option in 1978 - don't know about 79.
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post #4 of 11 Old 07-30-2009, 02:27 PM
flaugher
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It was certainly an option in 1979. and "The last year of the 304 was 1981" - JeepWiki

1979 CJ-7, AMC 304
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post #5 of 11 Old 07-30-2009, 02:31 PM Thread Starter
LazarusCJ7
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from what I've read there were 2 version of the 304, better version (more HP) was available up to 79, then the 80 and 81 version was a dog. I am looking to find out how to tell the difference. Markings, serial number, etc?


http://www.jeeptech.com/engine/amc304.html

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post #6 of 11 Old 07-30-2009, 03:10 PM
Full Tank
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Your post got me thinking so I did some quick google research. It turns out the last AMC automobile produced with a 304 was 1979.

http://en.wikipedia.org/wiki/AMC_V8_engine

The Jeep brand continued using 304's thru '81.

So, one gasket kit covers both.

https://secure.pawengineparts.com/sh...8199&catid=247

Mystery solved.

FT

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Dana 30--AMC20--D300--T176--258

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post #7 of 11 Old 07-30-2009, 03:47 PM Thread Starter
LazarusCJ7
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Thanks Full Tank...I just checked my VIN number against:

http://www.jeepfan.com/tech/tech_vincj.htm

and my jeep originally came with a 258, code C, so its definitely not the original. One mystery left...the 304's that "jeep" put out (80-81) are not rated as high on HP. I wonder if it's just the smog junk. Which brings me to a different question.... (and maybe a new thread) What SMOG junk can be eliminated without sacrificing reliability?

Did I just hijack my own thread?

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post #8 of 11 Old 07-30-2009, 05:52 PM
jfwireless
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Take a look at the engine and head casting numbers, to see what you have. No telling where that 304 came from.

http://www.planethoustonamx.com/main...ng_numbers.htm

Jim
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post #9 of 11 Old 07-30-2009, 09:01 PM
fuzz401
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dont put a lot of faith in the HP numbers not much changed in the motors after 73

1978 cj-7 had since 1979
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post #10 of 11 Old 07-31-2009, 07:36 AM
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Everything I am finding supports the 304 died in 1979, at least as far as manufacture. This link has pretty good engine code information.
http://www.scribd.com/doc/7131539/AMC-Engine-Codes

Anything is possible if you don't know what you are talking about.
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post #11 of 11 Old 07-31-2009, 07:56 AM
Ziptie2k2
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The HP numbers aren't really reliable anyway. The SAE certification of HP was just getting rolling in the 70's because of bogus claims of HP. Who knows when AMC jumped on board if at all.

B.T.W. My 79 Golden Eagle came original with one.

1977 - CJ7.......1979 CJ7.......1981 - CJ8.......1986 CJ7 Cant get enough!

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