Quote: After my cast block cracked I have been thinking the ole dart should have one.
So are there any cons to a aluminum block?
You had a stock RB block and cracked a main web?
The scarcity last Summer for the World blocks made me look at an aluminum block for my 540 build. The only real downside I heard was that unless they were filled the bores would not stay round and true. I can also tell you that a filled alum block with a race size radiator will get pretty warm if you are just driving around at 45 MPH in 3rd.
My World 572 B1/MC motor although it a race set up, leaks down at less than 1%. So, I don't agree.
