Twenty Valve engine is escalating in recognition as the choice of engine in rear wheel travel conversions in cars such as the AE86. Nevertheless it does have some further difficulties associated over a 16V in converting it to operate within a north-south way. We've been beginning to make some improvements https://toyota4ageblacktopenginef03793.blogs100.com/31815105/the-smart-trick-of-toyota-4a-ge-that-nobody-is-discussing