Cummins 12V October 24, 2012 06:08AM
I was wondering what is the best year for blocks and best head combo for the Cummins 5.9 12 Valve.

I am looking for a good block ,crank and head for an alky combination the rest of the motor doesn't matter.


Any help would be appreciated.
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Re: Cummins 12V October 24, 2012 07:38AM
A block you want to stay away from is a "53" block. Most 53 stamped blocks were in the 24 valve configurations, but i have heard of some 53 12 valves. The 53 block is prone to cracking.
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Re: Cummins 12V October 24, 2012 07:49AM
Curious - where are u located ???
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Re: Cummins 12V October 24, 2012 01:04PM
Ran a 53 85 hooks going to bore it out and run it some more were they crack wont hurt them outside the block and nobody runs water mines full of fiberglass resin 270 566 2901 if you wont to call
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Re: Cummins 12V October 24, 2012 06:46PM
glad to hear you have had such good luck with your 53 block. If i were out looking for a block to buy, I would still stay away from it. Why buy something that is prone to cracking the water jacket? If it will crack the water jacket horizontally near the oil pan, it will crack in other places, possibly places you cannot visually see.
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Re: Cummins 12V October 25, 2012 12:30AM
I am from New York.
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Re: Cummins 12V October 26, 2012 03:48PM
No differences for what you are going to do.. Injection pump and flex plate vs flywheel.. Heat exchanger for the trans..
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Re: Cummins 12V October 25, 2012 12:44PM
Who would be doing your alky work?? Would love to do one in a light pro stock application....
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Re: Cummins 12V October 25, 2012 01:55PM
I do my work myself If your going to pour the 53 block dont be afraid of it mine was gave to me cracked when i built it pourd it and forgot it all 5.9 cummins heads are bad to crack something to think about If your not running water who cares
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Re: Cummins 12V October 26, 2012 12:44AM
Haven't thought that far ahead . Just gathering parts.
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Re: Cummins 12V October 26, 2012 02:21AM
Might be a silly question but I was offered a 1994 5.9 out of a pickup this morning with an automatic transmission.

I want the motor only plan on running a crower clutch. Is there any difference in the 5.9 automatic and 5.9 manual transmission crank.
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Re: Cummins 12V October 27, 2012 12:15AM
Id be looking for a 53 block. Your gonna fill it any way, simple minded people who kno it all !
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Re: Cummins 12V October 27, 2012 01:08PM
i no enough i pull with tractors that have more monney in there wheels tires and sheetmetal than i have in my whole tractor and ive got 3rd in points 3 years strait smart $$$$ i dont no it all but a 53 block cracks on the out side of the block along the water jacket hard block wont leak and my fiberglass aint never leaked
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Re: Cummins 12V October 27, 2012 10:17AM
Filled or not, the 53 is often still a weak block. Not all of them are but why play the odds on a high hp build.
The best block to build from is the ag block (often marked with a 56) it weighs in the neighborhood of 30-40 lbs more than a standard block. Beyond that, a 6.7 common rail truck block with a deck plate and pressed in sleeves is pretty much the best setup.
I am not a simple minded know it all, I speak from experience.


Chris Watson
Watson Motorsports
Batavia, OH
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Re: Cummins 12V October 27, 2012 04:19PM
I'm not referring to water leaking from a crack between along the freeze plug area.
I can show you plenty of pictures of 5.9 blocks with the top and sides blown completely out.
I'm glad that you have had success with your tractor and like I said not all 53 blocks are weak.
I just see it as an unnecessary risk to take.
It doesn't matter if you are building a two bedroom ranch house or a multi million dollar mansion, you should do it right and start with a good foundation.
On the other hand, if your existing foundation is cracked and leaking, and reinforcing and sealing it will get you by, then by all means do so.


Chris Watson
Watson Motorsports
Batavia, OH
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