6/1 & 10/1 heads

[akghound]

Just need to know. Is a 6/1 head the same as a 10/1 head? Also, I need IDI heads.
Ken Gardner

[Crofter]

Just need to know. Is a 6/1 head the same as a 10/1 head? Also, I need IDI heads.
Ken Gardner

The bore is larger on the 10-1 (listeroid) and possibly the valve diameter too. The margin of the valve is very close to the gasket and side of the sleeve so I think it would interfere with the smaller 6-1 bore. It is possible the in head chamber volume is different too. Different piston to deck height is specified. I dont think you can assume they are the same.

[JohnF]

A 10/1 head will not fit on a 6/1, the valves hit the top of the bore.  Go on - just ask me how I know!  Valves are different sizes.  I suppose it MIGHT be possible to put a 6/1 head on a 10/1 cylinder but the smaller valves will give you breathing problems.  Also, I don't think it would seal too well.  You certainly cannot go the other way.