I'm thinking of getting 270 cams also and have been speaking to Peter Burchill on Facebook about it.
He says it's best to fit 270 cams with standard 180 pulleys and cam timing on a road car.
Anyway, Peter would be a good person to contact about 270 cams.
As a reference for you, my 180 dyno'd at 195BHP (corrected).
Spec was: standard 180 heads/cams. ITG Maxogen, Janspeed manifolds, Janspeed sports cat and custom built "Longlife" stainless exhaust.
Rolling road and remap was done at "AMD" in Thurrock, Essex. (They run a BTCC car!)
I'm about to upgrade to ported heads with 270 cams.
It's a shame you live so far from me, as I have a VIS tester.
I'm near Chelmsford, Essex.
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