9000rpm because that's what the data sheet for the HKS Step 2 2.8L stroker kit says it'll do - and the engine seems happy doing it 🤷♂️ N1 block, stroker kit, 272 cams, some mild head work, makes around 540awkw on E85. Engine's been solid, cops a beating with "2 stepping" and flat shifting sequential but it's getting retired to a more sedate street car life shortly to make way for a 10,000rpm 3.2L.