Irrespective of Other folks assert of a 20HP or even more enhance- on modified heads by itself, this is solely extremely hard with no camshaft or pistons improved. Toyota has casted and machined all their 4 valve heads to really close and accurate tolerances for street (and rally) use. Up https://lorenzouwyyv.affiliatblogger.com/78885476/detailed-notes-on-4age-20v-blacktop-for-sale