Plus if turbocharging a factory 4-valve head for about 4hp per CI at 7500, I think one can use mostly stock components of some popular 4-valve head platform. For example, I think that a destroked modular Ford could use well selected production heads with stock valve sizes, a production “boss” type intake manifold, etc. The main aftermarket components would be custom rotating assembly for less stroke and the selected compression.hoffman900 wrote: ↑Thu Nov 02, 2017 5:39 amAt that rpm peak, you’ll want 4 valves. If you’re not limited by rules, you’ll want 4 valves per cylinder. Makes for a much wider power band.
A higher budget route would be to find a wrecked AMG car and use the MB/AMG M178 which makes over 600hp in stock form from 4L V8 with somewhat restrictive breathing into the compressors and out of the turbines. That might be a fun thing to “turn up”.