11mm lift isn't excessive on an 18RG but you would want to check spring bind and piston/valve clearance.
I ran 282 inlet and 292 exhaust total duration and 10.5mm lift on the street running 45mm webbers with the same pistons you are running. Head was shaved a poofteenth so comp ratio was more like 10:1. i used Nissan double valve springs rated at 80lbs seat pressure.
It would ping sometimes on super but loved avgas. Ran a solid 112rwkw at 5000rpm the day it was dynoed...ignition was breaking down after that. Easy 180-200hp flywheel depending on timing and fuel used.
Wed, 20 April 2005 03:43
