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Are there any differences between an aluminum Genesis block and an aluminum Shelby block?
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Aluminum Genesis block hasn't been cast yet. Won't be for a while. The Aluminum Genesis piece will look like a sideoiler and have sideoiler oiling pattern; from what I've heard. The Shelby Aluminum block is ONLY available in Aluminum and isn't a sideoiler (important to some). The Genesis block, if painted, could be passed off as a regular 'ol iron sideoiler if you were of the mind to do so. I believe the Shelby block has dual crossbolts standard, whereas the Genesis block would have single crossbolts (though again, from what I've heard, dual crossbolts might become an option).
Biggest difference right now, is you can actually buy an aluminum Shelby block and expect delivery fairly quickly. Can't say the same for the Genesis aluminum block. On the other hand, you can actually buy a Genesis iron sideoiler block (check with Keith Craft) but there are NO Shelby iron blocks available.