Who is BS'ing who?

Who is BS'ing who?

cuda67, I'll help you cut through the BS and get to the "factual" information. Here goes

cuda67 said
I really don't care, if I wanted mileage I would have gone to a 6 cyl.

Agree. I did not build my 408 for mpg. But I did build it to be street driven, and driven distances (measured in hundreds of mile). The "rules" I set for my build were: great torque (torque is king on the street), good horsepower, and it had to look old school. For me old school meant that I was going to use an LD-340 (dual plane), mechanical fuel pump, stock appearing ignition (used FBO system) and my 1991 360 with 308 heads.

cuda67 said
Wow, what stories are being told here about gas mileage. I have read with much interest the reported 12-18 mpg with 408 strokers and 360's, I say caca to this. I just like to put out factual information to other folks that may be interested or curious as to MPG in a certain drive train and engine and not fantasy.

Okay cool, you like factual information, me too. So why dont we turn your rant into some facts so others who are looking to build their motor have a basis in fact.

cuda67 said
I now have about 250 miles on the new Mopar crate 360/380 magnum with a 770 Holley street avenger, Mopar M1 intake, 904 tranny, 323 sure grip and 3000 stall and the mileage is 8mpg not 12 or 15 or 18 as some people claim.

My proposal; Ill outline my engine build and drivetrain specs, and you post your info right next to mine for comparison. Then we can let folks analyze the factual differences between our builds. I believe we both built fast street cars so this should be a good comparison.

For everyone else; If you compare your build to mine remember I did not build this car to be a race only car or motor. Yes, I know I could have gotten more horsepower/torque if I had only (you fill in blank). So go back and read my rules for my build. Lets keep it in line with cuda67s original premise that decent performance and livable mpg cannot co-exist.

Are you game? Here goes:

Car:
1972 Demon
4-speed (close ratio gear set)
Rear: 8.75 with 3:55 Sure Grip
Rear Tire: Nitto Drag Radial 275/50-15 (25.75 dia.)
Exhaust: TTI step header and full 2.5" with X-pipe
Speedo pinion: 35
Speedo calibrated by Redline Gauge Works
Highway mpg 15.46
This was a 500 mile trip averaging 60 MPH with normal driving (no drag racing). I stopped every 150-170 miles to top off the tank (because at that point I was down to 1/4 tank) and to give my tailbone a rest. The route was from the east coast of Virginia to Roanoke using two and four lane roads (Rte 5, Rte 106, and Rte 460).

Camshaft - Hydraulic Roller (Cam Motion)
Duration Intake @50 242
Duration Exhaust @50 248
Lift Intake: 570
Lift Exhaust: 562
Lobe Separation: 110
Centerline (Installed): 105.5
Valve Springs (Comp Cams: 994-16)
Rockers: Comp Cams Pro Magnum Roller Rocker Arms, 1.5 ratio
Roller Lifters, 1991 LA 360 Stock

Crankshaft, Cast (Eagle) Internally Balanced, Stroke 4.000
Pistons (Wiseco, Pro Tru Forged) PN: WISPT036H3
Bore: 4.030
Dish: 20cc
Compression Height: 1.460
Compression Ratio (Based on head gasket that is .039 thick with a 4.180 bore and a piston deck height of .0040)
Static Compression Ratio: 9.84:1
Dynamic Compression Ratio: 8.85:1
Dynamic Cranking Pressure: 179.26 PSI

Heads casting #4448308
Combustion Chamber Volume: 65cc
2.02" Intake (CFM)
1.60" Exhaust (CFM)
Flow: (Intake/Exhaust)
0.100 Lift 64 50 78.12
0.200 Lift 132 98 74.24
0.300 Lift 184 136 73.91
0.400 Lift 226 175 77.43
0.500 Lift 254 189 74.41
0.600 Lift 247 196 79.35

Carburetor (Pro Systems Pro Series - XE)
Holley 4150 HP Main Body
Jets: 75/85
Power Valve: 6.5/plug
Accelerator Pump: 50 cc/30 cc
Vacuum @ 1000 RPM: 11"

Distributor: FBO Mopar Electronic Ignition A688
Initial Timing: 18 Degrees
Total Mechanical @ 3200 RPM 16 Degrees
Vacuum Advance (@ 10 inches) 12 Degrees
Timing set @: 34 Degrees

Engine Dyno results: (with el-cheapo 1-5/8 headers because TTIs wouldnt fit on dyno)
Peak Torque @ 4100 RPM: 460
Peak horsepower @ 5800 RPM: 443