I strongly caution you against buying anything made by World Products.
My brother bought a set of World products sportsman II heads brand new out of Summit. We installed them and the motor smoked bad!! We took them to the machine shop and the heads were so far out of spec that the valve seals wouldnt seal and were beyond repair.
We contacted world products before and after taking them to the machine shop. We told them what the machine shop had found and they said that there heads are engineered for racing and it is not un common for race cars to smoke and that they would do nothing for us.
Lesson learned for us we now have a $1,000.00 set of paper weights
World Products does not stand behind there products.
They Suck!!!!!! The machine shop said that those were the worst cast heads they had ever seen.
Consider yourself warned
