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Originally Posted by race-rodz
ok...so somebody please explain why the iron block is gonna be a better choice?
im confused, thinking that a good alloy block will handle just as much power with less lbs compared to an iron block. where is the weak link in the alloy block?
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GM Offer several different versions for the aluminum blocks. The original aluminum block was rated at a max 750hp. They have a new version that can handle at least 1000hp.
Here is how Dan at DLS engine explained to me what happend with the Aluminum block that i had. You have 3 different metals in this block, Aluminum, Cast iron Caps and Steel Sleeve's. All which are affected by heat and heat cycle's diffently. The other problem that he has experience when reaching peak hp with this block is that the bottom end actually moves around. Since we agreed that i wanted to make this truck a true driver and not have any concerns he suggested that i either buy the new Aluminum Block $4200.00 or go with the cnc cast iron block $2600.00. The choice was simple for me to buy the cast iron block at this time however you never know i may change my mind and pony up the bucks and buy the Aluminum block.