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Rockridge 4WD IS Taking Zone Offroad Suspension Lift Kits JEEP Gear Change Packages From ROCKRIDGE 4WD. We Are DIFFIron Cross Customer JK and TJ Wrangler Bumpers now at ROCK

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Unread 05-09-2013, 11:15 PM   #1
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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Unread 05-09-2013, 11:27 PM   #2
Old4X
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258 2 barrel built March 13, 1984
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418 miles on 19 gallons of gas. Can't beat the BBD !
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Unread 05-09-2013, 11:49 PM   #3
jeep16
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will everything from my 1990 yj bolt up to it?
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Unread 05-10-2013, 01:21 AM   #4
JeepingJustin
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Yes it should.
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Unread 05-10-2013, 10:31 AM   #5
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.
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Unread 05-10-2013, 12:08 PM   #6
dtn8tr
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What about the difference in the early to mid 80s head bolts sizes?
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Unread 05-10-2013, 12:36 PM   #7
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.
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Unread 05-11-2013, 02:03 PM   #8
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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Unread 05-11-2013, 05:34 PM   #9
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.
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