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918 springs are good up to 600 lift, 921 and dual springs go even higher on lift. 921 springs are a lot more than the 918 springs..but better insurance for greater lift.
As mentioned a 224/228 cam will get you what you want.
Good luck
Anything in the 222-226 range will get you there easily. I have ported stock heads with a 221/221 cam, with cats and everything and I put down just under 410rwhp.
Anything in the 222-226 range will get you there easily. I have ported stock heads with a 221/221 cam, with cats and everything and I put down just under 410rwhp.
im at about 420rwhp on my stock heads with a 232/234 .595/.598 cam, this is in a Z06 though, great drivabilty and would recommend it to anyone, i didnt want to go in the 22X range because i knew i would want something bigger so from everything i read a cam in the low 23X is perfect
ive seen 22X cams make good power and sometimes more than the bigger cams on stock heads, but its the nearly 400rwtq that was the deciding factor on this cam, and i have over 350rwtq from 3500 up
With my current longtubes and PRC ported LS6 heads on an otherwise stock 2001 ls1 C5, what cam would give me a solid 410-415 rwhp.
Looking for something I don't need to change springs on every year hopefully.
Would it be TR224 or maybe a G5X1E
The TR224 would definitely get you into that range. I have a similar cam (224/224 .581/.581 on a 112LSA with 4 degrees advance). I'm at 410whp/390tq through Texas Speed's Stage 2.5 5.3L heads. The really, really nice thing about this cam is its broad torque curve; its at 350tq and up from 2,500rpm. That, and it's somewhat mild-ish (at least compared to what a lot of guys are running). I was looking for something that would be a significant jump above stock at all points from 2,000 up to 6,500. Here's my before/after dyno.
P.S. The G5X1E was my second chioce. I have seen several guys running that cam with AFR heads getting 450whp consistantly through LS6 intake manifolds, and a guy hitting 470whp through FAST 90/90. I wound up going with the 224 for the lower end...