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Correct, the spark plug seals will be replaceable. They will use Viton O-rings in its place. They are doing a group buy on them, they need 10 sets sold to make them happen. First set will be the test set, then the remaining sets will be full production run, just so they can get pricing to where they have it now. Otherwise it's like 3k just to make one set standalone.
Ive seen people powdercoat stock ones .. 1300 for valve covers? I would spend money somewhere else
Definitely overpriced. I understand all these companies have to make money somehow. But the past 10-15 years aftermarket prices on everything has doubled, tripled, quadrupled and it isn't needed. Anything even simple differential assembly. I remember I bought a 8.8 31 spline eaton LSD for $200 new in 2005. I don't even want to price a LSD now. Billet is a great lightweight strong material, love the stuff. Wished we had more manufacturers for interior pieces like the the GM/Ford guys have.