Hey guys, apart from the obvious aluminium vs cast iron difference and bore diameter, can anyone name any other differences in the block design?

I’m planning on building an ls1 (which I have) but using a cast iron lm7 block (1000+ Hp with boost) and just wondering if I’ll run in to any other anomalies between the two blocks. Thanks guys.

 

External dimensions, bolt holes, thread patterns, all the same

 

Thanks for a quick reply sir! oil galleries, oil path etc. the same do you know?

 

Identical. They are the same basic design all the way through.

 

Same minus one bolt hole on the front of the block where the alternator bracket goes I think. The bracket will work without it but you could get the block drilled and tapped just in case.