djsilver wrote: You can add adjustable timing gears as long as you car doesn't already have variable valve timing. ...
Not true. You can change cam gears no matter the system. That being said, if you have variable valve/cam timing, why would you? It's a very small point, but don't want misinformation to get out there. :-)
I won't argue with you but I've pasted the relevant section of the 2011 rules below. Bolding is mine.
AA. Camshafts and related parts must remain standard except that alternate
cam drive pulleys or gears may be used to adjust cam timing
if no variable cam and/or valve timing system exists as standard.
Type of cam drive (chain, belt, gear) must remain as standard. Alternate
parts of the same general type (e.g. roller chain in place of “silent”
chain) may be substituted. Mating parts (block, heads, covers,
retainers, etc.) may not be altered. Vehicles equipped with a variable
cam and/or valve timing system as standard may use alternate
computer calibration to adjust cam and/or valve timing but may not
change or substitute cam drive components (hardware).
Hmmm, I see your point. I don't think that was the intention; I'll run it by the boys on the next SPAC call and see what happens.