Apologies for resurrecting a thread from the past, but as it seems that at zero posts (and 6+ years of lurking after registering) I can't start a new thread, this might be the most relevant and least annoying way to do this.

In essence, I'm looking forward to building a large-displacement YB, tall deck alu block + stroker crank. I'm only aiming at between 500 and 600bhp, but I insist on having a broad powerband and good.. no, scratch that, great throttle response. Approximately 9-9.5:1 compression, twin scroll EFR7163 or 7670, E85 as a possibility. Probably with a (still experimental) diverting quick spool valve on a split (1+4/2+3) manifold.

What are my options for a 2.5l+, possibly even 2.6...2.7l bottom end? I know this won't be cheap when everything is said and done, but keeping it a bit more reasonable than writing an open cheque to a high-end engine builder sounds like a good plan at this point.