[wboss429]

we have a 50,000 mile street 460 that we spray, cast pistions,7200rpm a lot,if u want ur 460 to live forever 6500id say is safe, 6000 the heads r not even working,if u have cj,scj,or truck rods, there go 7500 at a lot of clycles,detanation is what kills this stuff,