My question still stands what is the niche for the XR1? In my experience the R3 will handle anything you want to throw at it. Why not do them in aluminum? Didn't Ernie Elliott make a run of aluminum blocks? Does anyone know if they exist? Deck height, etc.
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Quote: Someone educate me on the benefits of the XR1 Ritter block over an R3. I understand the market for the XR2 to get a taller deck, larger cube P7 headed combo but I just don't see the need in the XR1. IMO if Kent would have had the XR1 done in aluminum he'd sell quite a few. I for one would buy one or two myself.
Mike Gray
XR blocks use all 5 billet main caps, fully sealed cam tunnel, & a true priority main oil feed that is seperate from the lifter galleys. It weighs more than the R3's & has different freeze plug diameters.... little different lifter boss design.... that's about the differences. They cost about $600 more than an R3 (without bushings) the one SST showed is an upgraded bushed block done by Brian Tillburg here in PA who is doing the bushings for Kent, which costs extra. The additional cost over n R3 is basically to offset the Billet main caps & ARP studs they come with.
I understand the market for the XR2 to get a taller deck, larger cube P7 headed combo but I just don't see the need in the XR1. IMO if Kent would have had the XR1 done in aluminum he'd sell quite a few. I for one would buy one or two myself. 
