http://www.highperformancepontiac.com/t ... index.html
http://www.highperformancepontiac.com/t ... index.html
455 DynoTest Part II - The Devil Is In The Details
1974 Pontiac Lemans Front View
Here's the 463-cube power-plant back in the bay. Even with the A/C removed, the A-body checks in at 4,200-pounds without the driver.
455 DynoTest Part II - The Devil Is In The Details
1974 Pontiac Lemans Front View
The next step was to try a 1-inch Wilson tapered four-hole carburetor spacer. Jim Taylor decided to go back to his Holley carburetor for the spacer test since the fuel curve was more aggressive than the untuned Demon (we only made a jet change). Wilson claims its spacer will lean the engine out slightly, and since the Holley had No. 83/No. 80 jets, there was plenty of room for tuning with the assortment of parts we brought along.
55 DynoTest Part II - The Devil Is In The Details
1974 Pontiac Lemans Front View
Satisfied with the performance of the engine, Mark Erney switched over to the customer's Demon 850-cfm carburetor. The tune that was in the carburetor was for the engine combo prior to the upgrades. As expected, it was found to be too lean, and the power dropped to 456.5 hp (ignore the jet numbers handwritten on the carb float bowls).
Dyno Results
Each pull was backed up by another to verify the results.
Test 1
Notes: Jim Taylor Holley 850 DP, No. 83/80 jets, 36 deg timing
RPM Corr. HP Corr. Torque
4,000 371.7 501.5
4,100 389.3 498.7
4,200 399.7 499.8
4,300 411.2 500.3
4,400 421.0 500.0
4,500 428.3 497.9
4,600 437.6 496.9
4,700 443.7 495.6
4,800 453.2 493.9
4,900 461.3 494.0
5,000 469.4 490.1
5,100 472.9 486.2
5,200 475.8 477.7
5,300 477.7 472.3
5,400 483.7 468.1
5,500 483.6 461.5
5,600 482.7 442.2
5,700 483.5 434.7
5,800 481.5 427.6
5,900 478.0 417.0
Test 2
Notes: Speed Demon 850, No. 88/94 jets, 36 deg timing
RPM Corr. HP Corr. Torque
4,000 379.4 502.2
4,100 392.4 501.4
4,200 402.2 500.8
4,300 410.8 501.2
4,400 420.0 499.9
4,500 428.5 500.1
4,600 438.4 496.9
4,700 444.5 495.3
4,800 454.1 493.6
4,900 461.8 492.5
5,000 467.8 490.2
5,100 472.5 482.9
5,200 477.2 479.9
5,300 479.9 474.1
5,500 482.6 459.2
5,600 481.2 451.1
5,700 483.4 443.5
5,800 481.3 432.1
5,900 479.3 424.2
6,000 476.6 416.1
Test 3
Jim Taylor Holley 850 DP, No. 83/80 jets, 36 deg timing, 1-inch Wilson spacer
RPM Corr. HP Corr. Torque
4,000 395.4 516.6
4,100 402.4 515.1
4,200 410.5 512.6
4,300 420.3 512.4
4,400 429.4 511.9
4,500 441.5 512.5
4,600 449.2 512.5
4,700 459.0 510.7
4,800 468.3 510.5
4,900 473.5 505.8
5,000 479.1 501.2
5,100 485.0 497.4
5,200 490.1 492.6
5,300 492.7 485.6
5,400 494.7 478.8
5,500 496.8 472.0
5,600 497.0 464.4
5,700 498.5 457.7
5,800 500.3 451.8
5,900 496.5 441.5
6,000 493.6 430.4
High Performance Pontiac
Engine Buildup Worksheet
Engine Displacement 463ci
Bore/Stroke 4.185-in bore, 4.210-in stroke
Bottom End
Block Description '73 455
Deck Height 10.215-in
Crank '70-'73 Pontiac nodular-iron
Balancer BHJ PO-IB7-S
Rods Crower Sportsman forged steel, 6.625-in
Bearings Sealed Power HD
Pistons JE/SRP forged, flat-top with valve reliefs
Piston to Deck Height -0.005-in
Piston Pins JE full-floating with double spiral locks
Rings Total Seal TS1 gapless, low-tension oil rings (14-lb pull)
Fasteners Crower connecting rod bolts, ARP head bolts
Balancing By Hoffman Machine
1974 Pontiac Lemans Front View
With the Torker II manifold, the engine performed best with the 1-inch Wilson tapered spacer, picking up just under 17 hp and approximately the same amount of torque. The Pontiac now produced 500.3 hp.
Oiling System
Windage Tray Pontiac 455
Oil Pan Moroso 8-qt
Oil Pump Melling M54D, Moroso pickup
Heads
Casting Number 6X
Chamber Open/Closed Open
Head Mods Ported
Combustion Chamber Volume 90cc
Maximum Flow at 28 Inches of Pressure 255/179 cfm at 0.550 in
Compression Ratio 9.6:1
Valves Ferrea SS, 2.11/1.66-in
Angles Used in Valve Job 30- to 65-deg int, 45-deg exh
Retainers Comp Cams titanium
Keepers Crower jumbo locks, 10-deg with lash caps
Valve Guides K-Line liners
Valve Seals Corteco all-Teflon
Rocker Studs ARP Pro Series 2-in
Rocker Arms Crower full roller, 1.65 int/1.5:1 exh
Pushrods Smith Brothers seamless chromoly 0.083x5/16x9.150-in
Cam
Brand Crane solid roller
Duration at 0.050 252/256-deg
Lift 0.598/0.560 gross, 0.578/0.540 net
Lobe Separation Angle 112-deg
Installed Position Degreed to cam card by retarding 4 deg
Lifters Brand Crower roller
Valvesprings Comp Cams dual with damper
Seat Pressure 165 psi
Open Pressure 425 psi
Timing Chain Rollmaster -0.002-in, double-roller prestreched
1974 Pontiac Lemans Front View
The big heavy LeMans nose comes up on launch as the drag radials dig in.
Induction
Dyno Carb Holley 850 4781
Dyno Jets No. 83/80
Mods Notched rear float, jet extensions
Intake Manifold Torker II single-plane
Mods Port-matched only
Ignition
Distributor MSD Pro-Billet
Amplifier MSD 6AL
Coil MSD Blaster 2
Wires MSD
Total Timing 36-deg
1974 Pontiac Lemans Front View
Screaming toward the top end at Atco, the LeMans ran high-11s on this unseasonably warm 70-degree November day at the Pontiac Fall Nats.
Exhaust
Dyno Headers Hooker 1.75-in primaries, 3-in collectors
At The Strip
Once the engine was bolted back in the LeMans, Bill returned to the track. Though the Pontiac was quick at Atco Raceway where we photographed it, the best pass came at Bill's home track--Old Bridge Township Raceway Park in Englishtown, New Jersey. Footbraking to between 1,500 and 2,000 rpm, Bill matted the gas pedal on the last yellow. The 1-2 and 2-3 shifts were made at 6,000, and at the traps the clock showed 11.78 at 113.15. This was a substantial performance improvement.
Before And After Drag Test Results
Best Old Combo New Combo Improvement
60-ft 1.70 1.62 .08
¼-mile 12.54 11.78 .76
Best trap speed 107 113.15 5.15
4 LeMans Sport Strip Specs
Ancillary Engine Components
Air Cleaner K&N
Carburetor 850 DP set up like dyno carb
Jets No. 82/84 at track
Spacer Wilson 1-in aluminum tapered
Fuel Pump Mallory 140
Lines -10 from tank with sump, -8 to reg, -6 to carb
Regulator Mallory set at 7 psi
Headers Hooker 1.75-in primaries, 3-in collectors
Exhaust Kooks 3-in x-type pipe, Spintech mufflers
Timing 36-deg
Drivetrain
Transmission Ford AOD, done by FB transmissions in Long Island, NY; SFI bellhousing to mate Ford trans to GM
Converter Pro Torque 10-in, 3,500, (flash to 3,800 rpm)
Shifter B&M Pro Ratchet
Rear Factory 8.5-in, 3.90:1 gears, Detroit locker, Mark Williams axles
,Chassis and Suspension
Brakes F/R SSBC caliper, slotted 11-in rotors/stock drum, ABS Power Brakes master-cylinder electric accumulator
Wheels F/R Weld Rodlite 15x6/15x8
Tires F/R Goodyear Aquatred 215/70R15/M/T 275/60-15 Drag Radials
Tire Pressure F/R 35 psi/20 psi
Suspension Fr Stock with 90/10 drag shocks
Suspension Rr Dick Miller Racing bolt-on 4-Link, pinion set at 2.5-deg neg., adj QA1 set at 3 soft
Chassis Mods Six-point bar
Conclusion
Was this project successful? The 12.56 e.t. 4,400-pound LeMans now runs 11.78. According to Bill, "I feel a big difference in power on the track and on the street, but it drives like a stocker around town. It idles well and doesn't run hot. I feel like I could drive this car across country." Sounds like Bill got what he desired from the new JTES combo. Follow the plan outlined here and you can, too.
Bitner Automotive
33 Old Olden Ave.
Trenton
NJ 08610 Wilson Manifolds
4700 N.E. 11th Ave.
Ft. Lauderdale
FL 33334
Jim Taylor Engine Service
120 S. 5th St.
Phillipsburg
NJ 08865
http://www.highperformancepontiac.com/t ... index.html
455 DynoTest Part II - The Devil Is In The Details
1974 Pontiac Lemans Front View
Here's the 463-cube power-plant back in the bay. Even with the A/C removed, the A-body checks in at 4,200-pounds without the driver.
455 DynoTest Part II - The Devil Is In The Details
1974 Pontiac Lemans Front View
The next step was to try a 1-inch Wilson tapered four-hole carburetor spacer. Jim Taylor decided to go back to his Holley carburetor for the spacer test since the fuel curve was more aggressive than the untuned Demon (we only made a jet change). Wilson claims its spacer will lean the engine out slightly, and since the Holley had No. 83/No. 80 jets, there was plenty of room for tuning with the assortment of parts we brought along.
55 DynoTest Part II - The Devil Is In The Details
1974 Pontiac Lemans Front View
Satisfied with the performance of the engine, Mark Erney switched over to the customer's Demon 850-cfm carburetor. The tune that was in the carburetor was for the engine combo prior to the upgrades. As expected, it was found to be too lean, and the power dropped to 456.5 hp (ignore the jet numbers handwritten on the carb float bowls).
Dyno Results
Each pull was backed up by another to verify the results.
Test 1
Notes: Jim Taylor Holley 850 DP, No. 83/80 jets, 36 deg timing
RPM Corr. HP Corr. Torque
4,000 371.7 501.5
4,100 389.3 498.7
4,200 399.7 499.8
4,300 411.2 500.3
4,400 421.0 500.0
4,500 428.3 497.9
4,600 437.6 496.9
4,700 443.7 495.6
4,800 453.2 493.9
4,900 461.3 494.0
5,000 469.4 490.1
5,100 472.9 486.2
5,200 475.8 477.7
5,300 477.7 472.3
5,400 483.7 468.1
5,500 483.6 461.5
5,600 482.7 442.2
5,700 483.5 434.7
5,800 481.5 427.6
5,900 478.0 417.0
Test 2
Notes: Speed Demon 850, No. 88/94 jets, 36 deg timing
RPM Corr. HP Corr. Torque
4,000 379.4 502.2
4,100 392.4 501.4
4,200 402.2 500.8
4,300 410.8 501.2
4,400 420.0 499.9
4,500 428.5 500.1
4,600 438.4 496.9
4,700 444.5 495.3
4,800 454.1 493.6
4,900 461.8 492.5
5,000 467.8 490.2
5,100 472.5 482.9
5,200 477.2 479.9
5,300 479.9 474.1
5,500 482.6 459.2
5,600 481.2 451.1
5,700 483.4 443.5
5,800 481.3 432.1
5,900 479.3 424.2
6,000 476.6 416.1
Test 3
Jim Taylor Holley 850 DP, No. 83/80 jets, 36 deg timing, 1-inch Wilson spacer
RPM Corr. HP Corr. Torque
4,000 395.4 516.6
4,100 402.4 515.1
4,200 410.5 512.6
4,300 420.3 512.4
4,400 429.4 511.9
4,500 441.5 512.5
4,600 449.2 512.5
4,700 459.0 510.7
4,800 468.3 510.5
4,900 473.5 505.8
5,000 479.1 501.2
5,100 485.0 497.4
5,200 490.1 492.6
5,300 492.7 485.6
5,400 494.7 478.8
5,500 496.8 472.0
5,600 497.0 464.4
5,700 498.5 457.7
5,800 500.3 451.8
5,900 496.5 441.5
6,000 493.6 430.4
High Performance Pontiac
Engine Buildup Worksheet
Engine Displacement 463ci
Bore/Stroke 4.185-in bore, 4.210-in stroke
Bottom End
Block Description '73 455
Deck Height 10.215-in
Crank '70-'73 Pontiac nodular-iron
Balancer BHJ PO-IB7-S
Rods Crower Sportsman forged steel, 6.625-in
Bearings Sealed Power HD
Pistons JE/SRP forged, flat-top with valve reliefs
Piston to Deck Height -0.005-in
Piston Pins JE full-floating with double spiral locks
Rings Total Seal TS1 gapless, low-tension oil rings (14-lb pull)
Fasteners Crower connecting rod bolts, ARP head bolts
Balancing By Hoffman Machine
1974 Pontiac Lemans Front View
With the Torker II manifold, the engine performed best with the 1-inch Wilson tapered spacer, picking up just under 17 hp and approximately the same amount of torque. The Pontiac now produced 500.3 hp.
Oiling System
Windage Tray Pontiac 455
Oil Pan Moroso 8-qt
Oil Pump Melling M54D, Moroso pickup
Heads
Casting Number 6X
Chamber Open/Closed Open
Head Mods Ported
Combustion Chamber Volume 90cc
Maximum Flow at 28 Inches of Pressure 255/179 cfm at 0.550 in
Compression Ratio 9.6:1
Valves Ferrea SS, 2.11/1.66-in
Angles Used in Valve Job 30- to 65-deg int, 45-deg exh
Retainers Comp Cams titanium
Keepers Crower jumbo locks, 10-deg with lash caps
Valve Guides K-Line liners
Valve Seals Corteco all-Teflon
Rocker Studs ARP Pro Series 2-in
Rocker Arms Crower full roller, 1.65 int/1.5:1 exh
Pushrods Smith Brothers seamless chromoly 0.083x5/16x9.150-in
Cam
Brand Crane solid roller
Duration at 0.050 252/256-deg
Lift 0.598/0.560 gross, 0.578/0.540 net
Lobe Separation Angle 112-deg
Installed Position Degreed to cam card by retarding 4 deg
Lifters Brand Crower roller
Valvesprings Comp Cams dual with damper
Seat Pressure 165 psi
Open Pressure 425 psi
Timing Chain Rollmaster -0.002-in, double-roller prestreched
1974 Pontiac Lemans Front View
The big heavy LeMans nose comes up on launch as the drag radials dig in.
Induction
Dyno Carb Holley 850 4781
Dyno Jets No. 83/80
Mods Notched rear float, jet extensions
Intake Manifold Torker II single-plane
Mods Port-matched only
Ignition
Distributor MSD Pro-Billet
Amplifier MSD 6AL
Coil MSD Blaster 2
Wires MSD
Total Timing 36-deg
1974 Pontiac Lemans Front View
Screaming toward the top end at Atco, the LeMans ran high-11s on this unseasonably warm 70-degree November day at the Pontiac Fall Nats.
Exhaust
Dyno Headers Hooker 1.75-in primaries, 3-in collectors
At The Strip
Once the engine was bolted back in the LeMans, Bill returned to the track. Though the Pontiac was quick at Atco Raceway where we photographed it, the best pass came at Bill's home track--Old Bridge Township Raceway Park in Englishtown, New Jersey. Footbraking to between 1,500 and 2,000 rpm, Bill matted the gas pedal on the last yellow. The 1-2 and 2-3 shifts were made at 6,000, and at the traps the clock showed 11.78 at 113.15. This was a substantial performance improvement.
Before And After Drag Test Results
Best Old Combo New Combo Improvement
60-ft 1.70 1.62 .08
¼-mile 12.54 11.78 .76
Best trap speed 107 113.15 5.15
4 LeMans Sport Strip Specs
Ancillary Engine Components
Air Cleaner K&N
Carburetor 850 DP set up like dyno carb
Jets No. 82/84 at track
Spacer Wilson 1-in aluminum tapered
Fuel Pump Mallory 140
Lines -10 from tank with sump, -8 to reg, -6 to carb
Regulator Mallory set at 7 psi
Headers Hooker 1.75-in primaries, 3-in collectors
Exhaust Kooks 3-in x-type pipe, Spintech mufflers
Timing 36-deg
Drivetrain
Transmission Ford AOD, done by FB transmissions in Long Island, NY; SFI bellhousing to mate Ford trans to GM
Converter Pro Torque 10-in, 3,500, (flash to 3,800 rpm)
Shifter B&M Pro Ratchet
Rear Factory 8.5-in, 3.90:1 gears, Detroit locker, Mark Williams axles
,Chassis and Suspension
Brakes F/R SSBC caliper, slotted 11-in rotors/stock drum, ABS Power Brakes master-cylinder electric accumulator
Wheels F/R Weld Rodlite 15x6/15x8
Tires F/R Goodyear Aquatred 215/70R15/M/T 275/60-15 Drag Radials
Tire Pressure F/R 35 psi/20 psi
Suspension Fr Stock with 90/10 drag shocks
Suspension Rr Dick Miller Racing bolt-on 4-Link, pinion set at 2.5-deg neg., adj QA1 set at 3 soft
Chassis Mods Six-point bar
Conclusion
Was this project successful? The 12.56 e.t. 4,400-pound LeMans now runs 11.78. According to Bill, "I feel a big difference in power on the track and on the street, but it drives like a stocker around town. It idles well and doesn't run hot. I feel like I could drive this car across country." Sounds like Bill got what he desired from the new JTES combo. Follow the plan outlined here and you can, too.
Bitner Automotive
33 Old Olden Ave.
Trenton
NJ 08610 Wilson Manifolds
4700 N.E. 11th Ave.
Ft. Lauderdale
FL 33334
Jim Taylor Engine Service
120 S. 5th St.
Phillipsburg
NJ 08865