??? Iron Block and Aluminum Heads, ISSUES ???
??? Iron Block and Aluminum Heads, ISSUES ??? 
12-21-2004, 08:58 AM
#3
Originally Posted by 777
umm that is how all the recent iron block engines are setup...iron block aluminum heads....that is what the lt1 is...there won't be a problem
Obviously, the co-efficient of iron and aluminum are different and the expansion and contraction rates vary proportionally. I am wondering what the longevity of these setups are on the street with stop and go driving in a daily commute......
12-21-2004, 11:58 AM
#4
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Originally Posted by 777
umm that is how all the recent iron block engines are setup...iron block aluminum heads....that is what the lt1 is...there won't be a problem
12-21-2004, 02:55 PM
#5
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I am seeing a log of iron and aluminum combos now adays. Look at all of the new GM trucks. They all have an iron block and aluminum heads. I would think they are not having any problems. My budys truck has 150k on it right now it is an 01 6.0 iron block Aluminum heads. He has all bolt ons for the truck, Headers, TB, I think UDP, it is holding up good. You also have to remember that the ls1 is an iron sleved block.
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12-21-2004, 03:32 PM
#8
While I certainly don't think it is ideal, there are some smart enginerds that figured out how to make this combo work, and it has worked pretty well. If I had the money, and wanted a big cube motor, I'd personally get an LS2 block, and if not, have the LS1 block resleeved. If I was on a budget, you can't beat the price of an iron block with a stick.
12-21-2004, 07:36 PM
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i blew the head gaskets on my lt1 before 100k........there will always be more of a chance to blow a gasket between two different metals, but they've got the gasket size/material and the tolerances for head/block surfaces down to nothing now........as long as you don't overheat your combo you should be fine
12-22-2004, 12:05 AM
#12
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whats funny is cars have been pumped out of factorys with just that combination of head/block material for 30+ years.....yet it might be different with an ls1?
