Re: 2-bbl vs 4-bbl carb test
1130 GM forged crank
Eagle featherweight 550g H-beam 6.125" rods
SRP 138085 444g pistons with Casidiam coated pins
Camcraft Cams solid roller cam 269°/269° advertised, 240°/240° @ .05, .410 lobe lift, 110° LSA, 106° ICL, Isky Red Zone lifters, 210° 3/8" pushrods
old AFR 195's angle milled to 56cc with 1.5 Jesel Sportsman rockers
GZM vacuum pump, 8" vacuum in the crankcase
MSD 6AL, 31° total timing on 91 octane, up to 40° at 8000'
1-5/8" x 40" headers with 2-1/4" merge collector
2-1/2" Dr. Gas X-pipe with Magnaflow mufflers, over the axle tailpipes
We've tested the 2-bbl setup with a JDR 2-bbl with 1-3/4" throttle plates, and with a C&S Specialties 890 cfm 2-bbl. The C&S carb requires the Vic-2V intake to be enlarged, as the throttle bores are larger than the intake. The JDR carb was a high altitude setup, so it didn't do much better than the 4412 on a sea level dyno, about 355 rwhp.
The C&S is also set up to run from 6000 to 8000' and is quite lean on the dyno, but managed 365 rwhp. At altitude it really runs well, we always get compliments on how clean and crisp the car runs while other guys are having mixture problems and blowing black smoke.
The 4-bbl makes more power at all rpm's, but really starts to separate above 5000 compared to the 4412.