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Old 06-19-2009, 02:40 PM
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Iron block vs Aluminum block

I am about to purchase a new dart big block for my malibu to take to the track. Can anyboy tell me some of the pros and cons of a iron block vs an aluminum block and which one is the better to get.

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Old 06-19-2009, 03:34 PM
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Quote:
Originally Posted by 55pitbulltank
I am about to purchase a new dart big block for my malibu to take to the track. Can anyboy tell me some of the pros and cons of a iron block vs an aluminum block and which one is the better to get.
The only upside to an Al block is it weighs less, might run cooler and can be repaired. Everything else goes to the iron block, IMO.
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Old 06-19-2009, 03:53 PM
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Aluminum: Lighter, less durable.

Iron: Heavier, more durable.
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Old 06-20-2009, 08:18 AM
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aluminum 30% less weight, 200% more cost.

Iron for me. Durable, cheap, strong.
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Old 06-20-2009, 09:19 AM
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Unless you are a high dollar racer or just want to spend $$$ there is absolutely no reason/need for an aluminum block. An aftermarket iron block will serve you best. My $0.02
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Old 06-20-2009, 09:41 AM
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One thing no one else has said is the iron block will also make more power. The cly. bores stay round better because of less block movement promoting better ring seal. The aluminum block also grows quite a bit more IE valve adjustment needs to be done cold and set .010-.014 tighter than when hot on most 9.800" deck BBC's I have worked on. A Hemi or 10.200" block is worse on growing. If you can't run a cooling system run an aluminum block but if it is a wet cooling system I would buy the iron Big M myself. And remember it is not much more to build a 598 than a 540 when you are starting with nothing.

Mike
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Old 06-20-2009, 09:52 AM
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Agreed

I agree with the above posts.

If you buy an aluminum block, make sure all threads have steel inserts. Aluminum threads are susceptable to failure.

If money was no object, I would buy the less durable aluminum block to improve weight distribution for cornering. I have no money; so I am happy with the durable cast iron block and heads.
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