461 Double hump heads. Appear to have never been surfaced or butchered in any way. Valves look new. They were on a 327 that was in a barn find 47 Ford that had sat for 30 years. The block is standard bore and the steel crank is standard, just for your information. The valve springs appear to be the HP type with an inner damper but are probably no good sitting open for so long. I know the cam had taken a bent shape so I had to beat it out.