Cam tight in F4R head

[Matt Cole]

Chaps,

Has any one come across a cam that's quite tight to spin by hand? I have a clio head and the exhaust cam is stiff to turn even with no cover on. I ve tried 3 cams even the original one and all are the same. :scratch: the inlet moves freely with little force. With the cover on, torqued up and no valves etc, I can just about turn it with the pulley. Also no tight spots, its the same through 360 deg. What you reckon?

[michael tierney]

if the head has overheated or warped at some point this will happen to any OHC head :(.........the camshaft is true but the head is no longer true!

[Matt Cole]

I bought the head second hand with bent valves.:crap: really struggled to get one so took a gamble. Really peed off! Can it be rectified at a machine shop that line bores?