mega blocks are a little harder to find now unless your just talking about the newer world blocks.

Weight doesnt exactly matter for our application.

With the koleno you get some real good customer service which goes a long way sometimes. I think the Koleno from the factory is a MUCH higher quality then any of the Mega block stuff. The priority oiling in the Koleno is also a nice addition.

If I had the chance to buy a block when I was building my all out 500ci years ago it would have been with the Koleno.

What heads are you planning on using? Send me a Pm on your progress:)