351 CJ Engine |
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unlovedford
Senior Member Joined: 17-December-2010 Location: Tennessee Status: Offline Points: 10142 |
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Posted: 05-August-2013 at 2:56PM |
My '72 CJ has the 4 bolt mains. My '74 CJ has the 2 bolt mains. 1973 was the last year for the CJ 4BM blocks, but like others have said, a 2BM block can stand a lot of HP.
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Joe
1972 Mom's Squire Wagon 1972 Torino Wagon 1976 Torino 1968 Cougar XR7-First batch 1972 Torino 460 1989 BroncoII/Jeeps/Titanimous Popeye and Brutus (Rams) |
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iangj
Senior Member Joined: 06-March-2009 Location: Fonthill, ON Status: Offline Points: 1019 |
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'73 still had 4 bolt mains. Smaller valves and a wee bit less cam compared to '72. The intake will have provision for the EGR port. Exhaust manifolds are the same. The rest is the same.
The CJ had a 4-6 degree retard built into the cam gear. This can be easily fixed with a good quality gear & chain replacement. Auto cars had single points, 4 speed had dual points.
Edited by iangj - 05-August-2013 at 11:09AM |
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Ian Glyn-Jones
Fonthill, Ontario, Canada Wish I had My Baby Back Montego GT Registry Forum; http://mmgt.forumchitchat.com/ |
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Robbdtme
Senior Member Joined: 06-June-2012 Location: Central WI Status: Offline Points: 765 |
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All 2 bolts can be tapped for 4 bolt mains. Blocks are identical. Some even claim the 2 bolt is better by not weakening the main caps with the extra 2 holes.
Other than heads exhaust and intake the 73 did not have the 4 degree cam timing delay for emissions yet like the 2v versions. |
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Johnny cash Special 74-75-76 freak. 77 XR7. 78 LTD II sport looks pretty but poop 302 in it.
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Scott
Senior Member Joined: 31-January-2012 Location: Versailles,Ohio Status: Offline Points: 216 |
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From what I remember a 351CJ was called a CJ because it had 4 bolt mains no matter what year???????Anyone?
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Robbdtme
Senior Member Joined: 06-June-2012 Location: Central WI Status: Offline Points: 765 |
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HEADS have 4 stamp, Block is likely a 2bolt in 73. All 351C's are the same so the CJ part you are basically buying the heads and intake. If it is complete maybe 500 as a good rebuilder
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Johnny cash Special 74-75-76 freak. 77 XR7. 78 LTD II sport looks pretty but poop 302 in it.
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Scott
Senior Member Joined: 31-January-2012 Location: Versailles,Ohio Status: Offline Points: 216 |
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I found a complete 1973 351CJ engine.Needs freshened up but did run when he pulled it.Does't have orig.carb but is complete carb to pan.How much is it worth? Any suggestions would be great.
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