Well a stock cam has .444 lift, not sure on the duration. I had to take a additional .050 out of my 89 H.O pistons to fit my cam.
What was your piston to valve clearance when you assembled the motor? With any cam swap it is best to re-check piston to valve clearance, it is the only true way to know how close it is, and with the 2.02 valves in the Srs you would not be able to go over .509 lift, 220 duration with out the valve hitting on the outside of the eye brow. The manufactor of your 10:1 psitons should be able to tell you what lift the valve reliefs will take with your valve size, try them.
The difference between a .444 lift cam with low duration to a .550 lift cam with 228+ duration is huge, they are totally different is every aspect. It could mean 30hp plus, the cam is the heart of the motor.
With you 1.7's you would only need a cam with .520 lift to acheive .550
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D/R 10108 NMRA Drag Radial, 25.5 chassis, F1R
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