Thread: engine that takes leaded gas

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yep and seats can fall out crack and fail they can be put in were there cut to deep and weaken the head and you can cut in water with a head not made for a seat. weak valve springs beat in the ex side of the head as there more heat on the ex valve.BUT seats are cheap so cheap that i will not post what i pay for them in bulk theres good money to put in seats . if a older hard to find head i may not put seats in it has alot to do with how many miles its going to see . many heads are hard from the go if 1970 many were heat inducing the ex side of the stock head and there are very hard ..try cutting one out for a seat some time i have one other thing with seats they can hide a crack or repair thats ok if you know. that s not so good if your looking for cracks in the casting as a mag check will pass over whats hinding under a seat . the lead in fuel helped lube the Ex seats keeping the transfer of iron to valve face .most stock valves are a form of stainless steel this helps alot were the pulling of metal from the seat