235 pro action heads they told me they flow 330 280 that doesnt sound write to me but are they any good
Prior to the RHS buyout, they were definitely an impressive piece. Worked over they can flow some impressive numbers. But, I don't think 280 on the exhaust is right. I know mine were 363 on the intake side at .700 lift and 261 on the exhaust side respectively. Even at that, one exhaust port had to be repaired because it got into the water jacket, so 280 seems to really be pushing it.
And as others have said, the spark plug angle sucks on them. More than likely, you will have to grind away part of the header flange above the plug.
Prior to the RHS buyout they were a good peice????? that statement is incorrect. Before RHS acquired Pro Topline, the PTL quality control left alot to be desired, they shipped any "finished" product out the door. Also, the valve seats always cracked between valves. Since RHS bought them, they have changed the tolerances on locations, seat installation specs. The spark plug location is 100% same as PTL. The angle plug heads fit very well with a header designed for an angle plug. The straight plug has some issues fitted some of the more inexpensive "universal" headers. The problem is that the tip with the plug wire is close to the header tube. All in all it is a good as cast cylinder head. I use a bunch of them. Later JW