Re: capacity increase
Understand that balancing is key, and all reciprocating parts need to be dynamically balanced - they are assembled on a rig and then spun up. If the pistons are a bit lighter as well as the capacity increase that will help the response and the ability to rev a bit. You can also look at having the block 'decked' (skimmed) to raise the CR a bit which would work especially well if you use a programmable ECU like an emerald. We are in the middle of building up an 8v engine and the bottom end work -balancing, core plugs, rebore, decking was done by a place in Bristol (Padfields under Temple Mead Station ask for Will) which wouldn't be too far to go. Don't know abot flowing heads etc. depends if you want a one stop shop or get the machining work done an then assemble the engine yourself. Hope it comes together well.