I just splashed the Pantera after redoing the interior and getting the new DPM XR with oil cooler, filter and circulation pump and some other stuff.

I boost referenced the carbs and installed an AEM wideband lambda and I got 10:1 in a/f ratio from low to 3500-4000rpm... at idle it's at 12:1 but it drops very quickly to 10:1.

I started out with jetted at 86/96 and primary 6.5PV's that's boost referenced. I have 10-15mmHg (since it loopes from 800-1200rpm) in vacuum at idle in neutral and 5-10mmHg in gear.

I changed the jets for 78/89 (from 86/96) and got to 10.9-11.1:1 from "high" idle to 4000rpm on a 20minutes ride.

I went out for a couple of hours and a total of 70miles and I never saw the AFR above 10.6 from 1500-4000rpm. The EGT is at 1200F at 4000rpm in the SM Gen III end pipes.

The transom gets real black so I need to raise the AFR quite a bit.


The engine specs:
825HP@5800rpm / 815Ft-lbs@4000rpm
Block: Merlin II 509ci
Crank: Callies
Rods: Manley H-Beam
Pistons: JE blower pistons (757F)
Piston rings: Total seal TNT gapless top
Leak down (COLD): 1-3% on all 8
Cam: Marine Kinetics Hyd roller
242º/250º @ .050" / .646"/646" lift valve / 112LSA
Wot RPM: 5800rpm
Heads: GM 188 mildly ported chambers
Head gaskets: FelPro MLS
C/R: 8.3
Valves: 1.88/2.25
Valve springs: ISKY 8205 PLUS
Rockers: Jesel Comp Series 1.7
Intake: BDS Blower intake
Intercooler: Superchiller
Blower: BDS 8-71
Boost: 8PSI
Carbs: 2x Holley 9022 800cfm
Jetting: 78/89 2.5PV Boost referenced (NOW: 74/80)
Ignition: MSD 6AL (6k rpm chip)
Distributor: MSD 84891 Crab cap
Exhaust: Stainless Marine Gen III with 4.5" dry tails
Fuel: 93octane; The pickup tube has an id of 5/8", then AN-10 from there to the A-1000 pump and AN-8 to the fuel regulator. AN-8 to the fuel block and hard tubes to the carbs, AN-8 return with fuel cooler to the fuel filter. It should be steady through the rpms.
Fuel pressure: 8-9PSI