GENIII

Finally ordered the cam for my 408CI from Comp cams will arrive in two weeks, would anyone like to guess what the rwhp will be on the specs below, have I left anything out thanks. The engine will be in a Commodore in Australia.

Iron block 6L +30thou 408CI
4.000 steel crank
scat 6.125 rods
ARP main studs
forged flat top pistons -4cc
25% pully
Comp cam 244/248-613/615 @50 LSA 112
Comp 850 lifters
dual chain
ported LQ4 heads 72cc
cometic gasket
comp cam pushrods
stainless valves 2.05 int 1.60 exh
PRC dual valvesprings
titainium retainers
yella terra roller rockers
Racetronic injectors 42lb
Fast 90mm manifold
Fast 90mm TB
diff 4.11:1
6 speed manual
stage 3 clutch
compression 10.7:1

SS1875

iTrader: (34)

I'll guess 525 RWHP. That may be a little conservative depending on your tune. Good luck with it.

Ferocity02

iTrader: (60)

I am interested to see how the YT's hold up with that high lift above 5500rpm.

I would also guess in the 500-550rwhp range, with a good tune of course.

Beast96Z

iTrader: (21)

It really depends on who ported the heads and how good of a job they did. I to would ditch the yella terra's and replace them with the stockers. YT's are to heavy over the nose and cause valve float at high rpm's. There's no need in making your valvetrain unstable when you don't have to.

ArcticZ28

iTrader: (14)

Damn, almost the same setup I am about to put in. Except I have the stock LQ9's, stock rockers, an LS6 intake, and my lift numbers are .635/.627. So, my CR is at ~11:1. Would be sweet for you to pull 500+

BLK02WS6

iTrader: (2)

Similar to mine as well. I have locally ported heads with 2.055/1.60 valves and 66cc chambers. My pistons have a small dish, so I am at 11:1. My cam is 248/254, 614/612, 113. I am using stock rockers. I have an LS6 intake and ported TB (for now). Haven't gotten the tuning/dyno done yet, but I'm through a TH400, so I'll be lower than you M6 guys. 500rwhp would be cool, but I'm more interested in the track numbers

GENIII

Thanks guys, I have heard a few times now with the concern regarding yella terra roller rockers what problems do they have in my setup, would stock rockers handle my valve train and cam, or is it better going to other rockers, what is recommended. thanks.

Beast96Z

iTrader: (21)

People have ran the stock rockers on set ups ten times more stout than yours. You shouldn't have any trouble out of them. The yella terra's are to heavy on the valve side of the rocker, which is where you don't want extra weight. The added weight causes valve tain instability and valve float, espeacially with bigger cams with harder ramps.

slow trap

iTrader: (22)

i'd say low 500s rwhp also.ditch the terras and put the stockers back on.