[fostereast]

The stock 427 block weighed aroung 200LB or less. The Aluminum blocks weigh as much as 130 or so. For a 427 Iron block, the sideoiler is not heavy, check out Chevy's, and others. As far as I know there was no Iron manifold make for a street/race 427, so the most you will save by going all aluminum is around 100-130LB.

The new iron blocks are heavier, but the originals were not that heavy.