4:1, and Additionally, it arrived with new pistons that contributed to the improve from the compression ratio. The next generation utilised a small camshaft by using a throttle of about 60mm. The commonest problems:head gasket might are unsuccessful pretty early, it's important to vary timing belt on time, no lifters. https://b16engine55431.fitnell.com/73384027/the-5-second-trick-for-jdm-honda-engine