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base circle is too big. will need solid lash adjusters if you chose to keep those cams.

most high lift cams have a smaller base circle than std. hlas should adjust for up to 2mm difference.

i'm quite suprized the fit in with an increase of 1.5mm base and 1.8mm extra of maximum lift. that's a big difference from std.

small07 wrote:Could anyone assist in some advice on why a high lift cam 280 deg 10mm lift holds open the inlet valve on base cirle off lobe, cam has base circle of 36mm, std has 33mm, would this be the cause, or has it got to do with std hydraulic valve lash adjusters?

Thanks
Small07

I hope your measuring with at least verniers, 36 seems bloody big!!!
When you fitted your cams did you remove and strip and drain the lifters??????
Cause if ya didn't the followers will have pump up when you removed the old cams, and are now holding the valves open!!!!Ask me how I know that one
I gather these cams are built up ones so maybe you'll need to have them redone on the base circle.

Terry