Q Banga GTS

Hi, i'm building a LQ9 408cu motor for my 1973 HQ GTS Monaro (Australian muscle car), 1400kg's, T56 magnum 6 speed 3.7:1 diff, 27" tyre. it wont be a drag car, just a tuff streeter, weekend car. I know block will be heavy compared to a Alloy, but I can get Lq9 block cheap, and not many LS2/LS3 alloy blocks around here. Car had Iron Holden V8 and Iron heads.
I just wanted some opinions if i'm on the right track with my combo. Also what Carb should I run with this?
LQ9 crate motor, 408 stroker kit, 11:1 comp with 68cc Gm CNC LS3 heads. Victor Jr manifold & carb. Comp cam 281LRR HR13 part number 54-469-11
•RPM Range: 2000-7000
•Advertised Duration (IN/EX): .281" / .297"
•Duration @ .050" (IN/EX): .231" / .247"
•Valve Lift w/1.7 Ratio Roller Rockers (IN/EX): .617" / .624"
•LSA: 113°
Heads Flows
LIFT (inch)INTAKE EXHAUST

0.039 27.612 21.037
0.079 60.714 44.679
0.118 87.3 75.053
0.157 124.341 103.872
0.197 161.414 127.083
0.236 195.628 147.451
0.276 223.566 167.097
0.315 251.641 186.501
0.354 275.218 206.322
0.394 294.406 222.84
0.433 311.917 234.353
0.472 327.475 242.617
0.512 340.917 247.045
0.551 348.538 249.514
0.591 351.323 252.371
0.630 359.135 255.246
0.669 365.137 257.451
0.709 361.738 259.69
0.748 364.504 260.962
0.787 369.196 262.666
Thanks in advance,
Cheers,
Wes.

speedtigger

iTrader: (16)

With heads that big and an open plenum intake, I think most cam gurus are going to tell you to tighten up the lobe separation angle and advance the cam some. With a 3.7 rear gear, maybe something that looks more like low 230s intake, low 240s exhaust on a 108 to 110 LSA and a 106 to 108 ICL. If you are willing to go to a 4.1 rear gear a little bigger.

Q Banga GTS

Was thinking of going 3.9 rear end. Might look into a different cam.

dogsballs

give nick from njc lsx in melbourne a call. he's doing a L98 carb/dizzy on e85 for me. he stocks iron blocks and might even have a short engine on the shelf. porting ls3 heads is still hit and miss.

but as above, for carb needs 108-110 lsa. your cam is an efi cam.