TRex is history
TRex is history talked to geoff at thunder, he said he would exchange my TRex for a TRak cam. I was thankful for the exchange since the TRex wouldn"t fit. Now I see on here that I need 7.450 push rods unstead of the 7.400 that I have and I need 921 springs instead of the patriot extremes i have and alot of shims to get the coil bind clearance. C an it be any harder to get a cam to work in a car!?!?!?
keep in mind the difference in those cams, and the trex is quite a large cam which of course requires the different parts. itll all be good once u get the new cam in and u mash that throttle!! 
I don't see why you can't use the extreme duals with the TRak cam. It's not any more aggressive than the MS4 or Torquer V3 and most of those are running with the PRC Duals, which are the same springs as the Patriots. As far as shimming is concerned it wouldn't be a bad idea to do that with any spring you choose, but probably 90% of us don't. The best thing to do for pushrods is to measure with an adjustable pushrod length checker to see what you really need(7.45 sounds long to me).
I don't see why you can't use the extreme duals with the TRak cam. It's not any more aggressive than the MS4 or Torquer V3 and most of those are running with the PRC Duals, which are the same springs as the Patriots. As far as shimming is concerned it wouldn't be a bad idea to do that with any spring you choose, but probably 90% of us don't. The best thing to do for pushrods is to measure with an adjustable pushrod length checker to see what you really need(7.45 sounds long to me).
Keep the Patriot Extreme Duals! Also, I use 7.45 per Patrick's recommendation.
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Anyone running these big cams (MS3, MS4, trex, etc...) should really be flycutting their piston tops to ensure they have safe clearances, yet most people are too lazy to do this crucial step.
Lift does not determine piston to valeve clearance alone, its a combination of both duration and lift. The point where piston to valve clearance is the closest is at the low lift side of the cam lobe anyway, not where max lift occurs..
