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Floyd Hand's 455 Fellow Pontiac enthusiast Floyd Hand made additional performance gains in 2002. Check out the changes made to his powerful 455. Technical Data |
| Engine Block: | 1973 Pontiac 455 with 2 bolt mains | |
| Bore and Stroke: | 4.15" x 4.21"; bored .030" to accommodate forged pistons with moly rings | |
| Heads: | #7K3 heads with TRW stainless steel 2.11" and 1.77" valves (ported by "Hand") | |
| Deck Height: | zero deck height (.000") | |
| Valve Springs: | Comp Cams 995 | |
| Rocker Arms: | Harland Sharp 1.65 rollers | |
| Retainers: | stock | |
| Keepers: | Crower 11/32" +.050 | |
| Valve Seals: | Fel Pro SS 70014 neoprene umbrella seals, intake only | |
| Lifters: | Rhoads variable duration, PN 9518 | |
| Push Rods: | stock | |
| Crankshaft: | stock turned .010/.010 with polished journals; all reciprocating parts are balanced | |
| Rods: | stock untouched except for resizing big ends | |
| Rod Bolts: | ARP | |
| Pistons: | TRW forged +.030 | |
| Rings: | moly--Sealed Power E 300K stock type | |
| Main Bearings Rod Bearings Cam Bearings: |
Clevite (Michigan) 77 | |
| Timing Gear and Chain: | TRW single roller | |
| Gaskets: | standard Fel Pro builder's set, except with custom header gaskets made from Mr. Gasket flat gasket material | |
| Camshaft: | Wolverine WG 5059--234/244 degrees intake/ exhaust duration @.050; advertised duration,300/310 intake/exhaust; .536" lift intake/ .561" lift exhaust with 1.65 rockers; 112 lobe separation angle; cam installed with intake at 107 degrees per manufacturer's recommendation. Smooth idle with Rhoads lifters, 13.5 vaccum in Drive at 750 rpm. (Note: rough idle with standard hydraulic lifters) | |
| Intake Manifold: | Edelbrock Performer RPM with secondary divider cut .50". Left divider intact for better low rpm throttle response | |
| Carburetion: | Q-jet built by Cliff Ruggles--.073" primary jet with tapered second step rod with .025" tips. Use from .030 to .044 secondary rods depending upon weather | |
| Fuel Pump: | Holley 802 pump and regulator set at 3.5 pounds pressure; 1/2" fuel line from tank to regulator, 3/8" to carb. 5 gallon fuel cell installed with cutoff switch between regular tank and cell. Installed Perma-cool 1 quart fuel filter between tank(s) and pump | |
| Exhaust: | Hooker Super Comp 1.75" four tube headers into 3" Dr. Gas Crossover through X but reduced to 2.5" out into two 25" Walker Ultra Flow mufflers exiting through Flowmaster's mandrel bent tail pipes out the rear | |
| Ignition: | stock HEI with GM 990 module, and external Accel coil on distributor. Stock type resistance spark plug wires from Auto Zone. AC R44TS plugs gapped @ .048. Mechancial advance in at 3000 rpm, and inital timing set at 12, for a total mechanical advance of 30 degrees, plus 15 degrees vacuum advance | |
| Oil Pump: | Melling M54DS, max of 60-70 pounds of pressure when warm, 20-30 pounds @ idle; 10W-50 synthetic oil | |
| Transmission: | TH-400 with Trans Go Shift Kit; manually shifted at 5500 rpm. High stall torque ratio Continental converter | |
| Rear End: | 3.42 gearing in 8.5" 10 bolt | |
| Suspension / tires: | Boxed lower control arms, front sway bar, stock type springs and adjustable rear shocks. Cragar Superlites--6" front with stock street radials, 8" rear with Mickey Thompson 10.5 x 28 slicks. | |
| Safety Mods | 6 point chrome moly roll bar with driver's swing out bar, drive shaft loop, Moroso long wheel studs with open nuts and fire extinguisher | |
| Vehicle Weight: | typically about 3775 pounds in race trim with driver. With listed weight saving steps, weight with driver is approximately 3750 in race trim |
Performance: 11.57@ 116.09, 1/8th time was 7.33 at 93.22 mph, 60' time
1.58 seconds. Conditions: excellent. Runs were made wth a DP Holly carb.
The following ET was with Q-jet: 11.76 @ 114.56, 1/8th mile time 7.48@92.48,
60' time 1.68 seconds.
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