Regardless of Other folks assert of a 20HP or even more raise- on modified heads alone, this is just difficult with no camshaft or pistons adjusted. Toyota has casted and machined all their four valve heads to incredibly shut and precise tolerances for Road (and rally) use. Your browser isn’t https://toyota-4age-blacktop-engi08211.like-blogs.com/26623179/4a-ge-engine-for-sale-things-to-know-before-you-buy