engine marking - JeepForum.com

 
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post #1 of 9 Old 05-09-2013, 10:15 PM Thread Starter
jeep16
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1990 YJ Wrangler 
 
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engine marking

just grabbed up an engine jeep. identification says 403c13... can anybody decipher that for me please.

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post #2 of 9 Old 05-09-2013, 10:27 PM
Old4X
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1990 CJ7 
 
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258 2 barrel built March 13, 1984

418 miles on 19 gallons of gas. Can't beat the BBD !
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post #3 of 9 Old 05-09-2013, 10:49 PM Thread Starter
jeep16
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will everything from my 1990 yj bolt up to it?
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post #4 of 9 Old 05-10-2013, 12:21 AM
JeepingJustin
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Yes it should.
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post #5 of 9 Old 05-10-2013, 09:31 AM
Old4X
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It depends on V- belts vs serpentine on your original engine.

I have a V belt 4.2, and everything I have would swap to the older motor.

418 miles on 19 gallons of gas. Can't beat the BBD !
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post #6 of 9 Old 05-10-2013, 11:08 AM
dtn8tr
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What about the difference in the early to mid 80s head bolts sizes?

1997 TJ, 5" IRO front with 4.5" HD IRO WJ rear, 35x12.5x15 Mickey Thompson MTZ, JKS disconnects
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post #7 of 9 Old 05-10-2013, 11:36 AM
Old4X
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Quote:
Originally Posted by dtn8tr View Post
What about the difference in the early to mid 80s head bolts sizes?
That is where it starts to get tricky. Also some valve covers will not swap over.

The head bolt size differences need researching if the OP is thinking of swapping heads.

I have long considered building a 258 using the old style fully counterweighted crankshaft. At almost 100 lbs stripped, it gives a very smooth idle and incredable low speed pulling without stalling.

But as to the original question, I thought external accessories were what was being swapped.

418 miles on 19 gallons of gas. Can't beat the BBD !
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post #8 of 9 Old 05-11-2013, 01:03 PM Thread Starter
jeep16
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yes external accessories. but i am also curious about this head thing now. will any 4.2 head work?
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post #9 of 9 Old 05-11-2013, 04:34 PM
Old4X
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Quote:
Originally Posted by jeep16 View Post
yes external accessories. but i am also curious about this head thing now. will any 4.2 head work?
some 4.2's used 7/16" head bolts and some used 1/2" head bolts, just depends what year engine you have. Looks like 81-87 used 7/16" bolts and 71-80 and 88-90 used 1/2" head bolts.

You would have to use sleeves with the headbolts on that block if you went to a head made for 1/2" bolts.

418 miles on 19 gallons of gas. Can't beat the BBD !
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