Valve Timing on a 3 litre Turbo

[PJMARKOW]

Well I've got all my bits back ready to assemble the top end and do the valve timing. My cams are now 964 spec, and the Porsche machine shop where I had the work done recommends I time the cams at 1.68. Now this sounds a lot further advanced than what I've seen recommended on this forum for 964 spec cams. The Porsche mechanic said that because my engine is a 3 litre, to trust him on this spec as it will give me a heap more top end. The rest of the engine spec is K27 hiflo turbo, GHL headers, JE 7.5:1 pistons and EFI. What do you guys think?

Cheers

[ChrisBennet]

I'm no expert but if you advance the cam timing the valves open earlier but they also close earlier. I thought advancing the cam timing helped low end and retarded helped the top end?
If your machinist is wrong, it will help your bottom end and that's good too in a Turbo car.
-Chris