My Dad andI are restoringa 1975 F-100. It has a 360 FE Big block that we think hasgot some burnt valves, and we also think its in need of rings as well. It has a terrible smoke problem...and this is what we think may be the issue.

The Question is.....in research I have found that full cylinder heads are available for the engine, but i do not know if the stock heads from that era had smog tubes in them, or not.Any answers would be greatly appreciated.