BuckeyeROC

iTrader: (7)

Just wondered which springs you guys were running with the T-Rex? What is the difference between the Comps and Cranes recommended for this cam? Does one last longer than the other? Are the Comps worth the extra $?

JackZ28

Just get the patriot duals, and save yourself some heartache.

Stu'sWS6

iTrader: (3)

I would install whatever Thunder recommends for the cam-either Comp 921's or the Crane duals.

BuckeyeROC

iTrader: (7)

Anyone else? I'm going to call Thunder tomorrow and see what they say before I buy it. Just want as many opinions as possible.

JDPZ28

iTrader: (3)

I have the Crane's with a much smaller cam and have valve float at 6300 rpm's.
I plan on upgrading to the Patriot gold's soon.

ss rally red

iTrader: (8)

I have the same problem as you at 6500, either Crane 921's or gulp Patriot golds.

BadAndy

Would you say it's more a of a ramp rate problem or a lift problem? Do the patriot Golds require any head modification?

BuckeyeROC

iTrader: (7)

Are these dual springs the Patriot "Gold" springs?

http://www.texas-speed.com/item_deta...ProductID=1150

If so, then I should get those springs from TSP, then the T-rex, pushrods, and gasket kit from Thunder. A double roller timing set, ported LS6 oil pump, and ARP rod bolts. Anything else? Also, as asked by Badandy, do these springs require head modification?

I'm thinking the motor will have to be pulled for everything. Is this so, or is there a way to do all this with the motor in car? I read another post about using an engine hoist and dropping the k-member. Comments?

Jason99T/A

iTrader: (21)

I have used three different springs with the TReX cam. I have found the Crane duals work the best. I would recommended installing a .030" shim under each to get the pressure up and get the springs closer to coil bind. These are available through Thunder Racing as well.

Jason

BuckeyeROC

iTrader: (7)

Thanks Jason. Out of curiosity, what were the 3 different springs you tried? Do all the dual springs require head modification? How long can you expect any springs to last with this cam?

slow14U

From what TSP told me, the Patriot golds have the best seat pressure and are made of a better material then the crane duals which helps maintain that seat pressure for longer. You won't have to do any head work, i.e. machining, with crane duals or the patroit duals. I know this because my buddy just installed his crane duals and I just installed my patriot duals. I'm not sure about the comp 921's. Patriot's are only 295 for everything and cranes cost like 375 or something close to that.

haole_boySS

iTrader: (1)

None of those 3 springs require head modification. They are all stock diameter.