Question about KR cylinder porting
Posted: Tue Jul 05, 2016 11:55 pm
Hi everyone,
I have a quick question about the porting in this pair of KR cylinders recently purchased.
In the following photo you can see the the valve guide has been trimmed down to be flush with the curve of the port, rather than protruding into it.
Whilst the guides do extend proud under where the valve cover would sit, what are your thoughts on this shortening of the guide within the port?
I have seen guides "smoothed" or better profiled in the port before, but not cut down like this.
Would it provide sufficient "guidance" or support for the valve stem, or do you think it was done at time of porting just to achieve a smooth curve
around where the guide would normally extend? I assume new guides will need to be installed anyway, but wondering whether or not doing the same again would be advisable.
Note I am likely to eventually run these with single springs and K covers - likely on a tuned motor for the street - so assume I would need to remove the guides to fit the upper covers anyway.
I have a quick question about the porting in this pair of KR cylinders recently purchased.
In the following photo you can see the the valve guide has been trimmed down to be flush with the curve of the port, rather than protruding into it.
Whilst the guides do extend proud under where the valve cover would sit, what are your thoughts on this shortening of the guide within the port?
I have seen guides "smoothed" or better profiled in the port before, but not cut down like this.
Would it provide sufficient "guidance" or support for the valve stem, or do you think it was done at time of porting just to achieve a smooth curve
around where the guide would normally extend? I assume new guides will need to be installed anyway, but wondering whether or not doing the same again would be advisable.
Note I am likely to eventually run these with single springs and K covers - likely on a tuned motor for the street - so assume I would need to remove the guides to fit the upper covers anyway.