Despite others claim of the 20HP or more maximize- on modified heads on your own, this is simply not possible devoid of camshaft or pistons modified. Toyota has casted and machined all their 4 valve heads to pretty shut and accurate tolerances for Avenue (and rally) use. The substantial res https://jdmtoyota4a-ge94602.angelinsblog.com/26493569/top-guidelines-of-4age-engine-for-sale