Apology for slow reply. I'm wearing a few hats at the moment. Lol.

Our Race block is a maximum performance engine block. We made design revisions to best set us up for the future, taking full advantage of new developments that add to the strength of engines built with our blocks.

There are other options available in the market for anyone seeking a lesser option or looking to recycle existing parts. The orders we have already received for use with a 60mm cam, have been overwhelming.

Alternatively, our Dealers can machine one of our 'Pro' blocks for 55mm core camshafts. Important to where we position our HEMI, WEDGE and upcoming engine block products is that we never want them to be 'the almost strongest' engine blocks.