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400 blk 3.75". rb crank. What part # (kb hyper) do I need to look at? Closed chamber heads & I would mill the quench dome to get ~9.5-10.1. thank you for your time.



Why bother with Hypers? I'm using KB823's (forged), with Stealth heads @ 84cc, I had the block decked to 0, provides about 10.4:1 with quench.

LemonWedge - Street heavy / Strip ready - 11.07 @ 120