Whats stronger? Iron block bored out to a 441ci or just using my stock LS1 block
bored out with Darton sleeves to a 454ci. The thing is i want to try and stay away from using a iron block and adding the weight.
What do you guys think?

 

Also whats the biggest bore you can go on a iron block without sleeves?

 

How do you plan to bore to 441ci?

 

I think 427 is as big as it gets.

 

I would think no matter what the iron block will be stronger.

 

I'm sure the Darton sleeves have their fair share of strength but can't see it being better then the iron block.

 

lsx iron block for sure. rated to 2500hp. 4.250 max bore.

 

what block are you planning on boring... and depending on your access to a machine shop i'd think if iyou are going ot go with an iron block.. i'd go with the Lsx block that will be avail. very shortly.

 

Cast iron blocks are made not for their strength but for their low cost to produce.

Ductile iron is much stronger than cast iron.

Cast iron usually has a tensile strength of 30,000 psi to 50,000 psi.

Darton's ductile iron has a tensile strength of 100,000 psi to 150,000 psi.

 

Iron is always stronger than aluminum.

 

 

So if an iron block has a tensile strength of 30,000 psi to 50,000 psi and the darton sleeves have a tensile strength of 100,000 psi to 150,000 psi that would make the sleeves stronger. Think about it nascar uses darton sleeves along with top fuel dragsters and i'm not going to be pushing nearly as much power as they do.

 

I believe your only solution is the new LSX block. And whats keeping you from being at "nascar levels" if youre starting with a 44x cube?

 

Thats what i hear maybe i should just wait and spend a little more for the LSX block. there saying it going to be in the price range of 1800$- 2000$ is that right or a little more?

 

cast iron block over an aluminum one would be roughly a 1% total increase in car weight

 

so maybe 80lbs heavier then a aluminum block tops?