problem, an additional gear can be added to the main shaft as an option. This will drive a power steering pump.
While the heads will allow enough air to flow with the engine spinning at 12,000rpm, if you do want to reach those sorts of revs, you will need to upgrade a substantial amount of other components. But what’ s remarkable is that you don’ t have to, just to get the heads to fit.
Swindon’ s four-valve Porsche heads are available for anyone to buy
Spring 2026 The Engine Rebuilder 41