It's really not on that they don't give out the timing specs, every cam manufacturer does. We can work it out though, here is what we know: Piper make the “150” cam to Caterham spec (so the best starting point should be other Piper cams for the Sigma engine). The rocker ratio on the Sigma engine is 1:1. (ref newman cams: http://www.newman-cams.com/pdf/ford.pdf) It's a reasonably “hot” cam as it needs the valve springs changing. What we need to know: The lift & duration of the “150” cams. This is not secret information, the cams exist and can be measured, we need someone with some cams that aren't currently fitted to help out. As the rocker ratio is 1:1 then the lift is easy, just accurately measure the size of the lobe vs non lobe and the difference is the lift. Duration is not so easy to get accurately, but an estimation should be possible by holding them up against a timing disc in profile. Once we know lift & duration we should be able to find a similar spec and timing from one of the aftermarket manufacturers. Here is a load of info direct from Piper: http://www.pipercams.co.uk/pipercams/www/tech.php Cat Cams is also a good resource, http://www.catcams.co.uk/acatalog/Ford_Zetec_1600_16v.html Alternatively someone could just state the timing for these 150 cams.