I'm curious ,what are you putting this in and what did it come out of ?Hopefully not a bravo drive !You'll spend more time working on the drive than the engine,i speak from personal experience ,i learned the hard way! On alum heads,if they are the exact copies of cast iron heads ,the cast will make more HP.The cast iron keeps more heat in the combustion chamber,thus more energy.The obvious advantage of alum is the weight,and a lot of options on runner sizes and valve sizes. Here again i would not pay extra just to get an alum block,but if the total package is a good price and an alum block happens to be included great !

I think it came out of a cat,..Eliminator maybe
considering putting this in a 28 Pantera.
XZ drive

Ilmor? Aluminum block, 200 lbs lighter, 625 to 700 HP, reliable. Call Bob Mason at Ilmor.
734-456-3642
Good luck. Quent

Only drawback I've ever had.

I've seen the SAME thing happen last summer on a chevy bow/tie tall deck block.

Excellent examble what you can do with an aluminum block.With a good welder and a new align bore, i bet that block could be put back in service !