Floyd Hand's 455

The 462 engine in Floyd Hand's 1966 LeMans is very similar to Jim Hand's setup. Floyd says, "Why try to develop something different when Jim's engine runs so well at such a reasonable cost?" It has a very strong power range from idle to 5500 rpm and idles smoothly with Rhoads lifters. His LeMans is fully equipped with bucket seats and a custom floor shifter. It is painted Porsche red.

Floyd graciously provided the following information and photos to share with musclecar enthusiasts who visit the Pontiac Street Performance website. Thanks Floyd.

Floyd's mods in black existed in '97. '98 mods are noted in red. Check out Floyd's mods for 2002.

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: Wolverine WG-1524
Rocker Arms: Summit's 1.65 stock stamped steel rockers
Retainers: stock
Keepers: stock Updated: 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: stock 1970 cast iron with heat crossover removed; crossover openings in head sealed with aluminum plates; 1" partially open spacer installed under carburetor. Update: Edelbrock Performer RPM with secondary divider cut .50". Left divider intact for better low rpm throttle response
Carburetion: home built 800 cfm Quadrajet (Buick body and Pontiac base and cover); .074 primary jets with .041 rods; .036 secondary rods in cool weather, and .040 to.044 rods in hotter weather. 93 octane pump gasoline, no additives. Homemake cool air induction system with twin inlets to the firewall
Fuel Pump: Holley 802 pump and regulator set at 3.5 pounds pressure; 1/2" fuel line from tank to regulator, 3/8" gas line through metal Fram filter to carb. Gas tank level kept at least 1/2 full to prevent slosh away from fuel pickup point under hard acceleration. Update: 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: Cyclone 1 5/8" four tube headers (older style), 3" Dr. Gas crossover through the X but reducing to 2 .5" out of the X into two Walker Super Dynomax mufflers, and 2.5" Flowmaster mandrel bent tailpipes out the back. Headers modified to clear starter and to match the head ports. Update: Installed 25" long Walker Ultraflow type mufflers.
  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: 3.55 gearing in 12 bolt limited slip with "C" clip Eliminator package installed for safety Update: 3.42 gear in 8.5" 10 bolt
Suspension / tires: boxed lower control arms, , stock type springs and shocks. Cragar Superlites--6" front with stock street radials, 8" rear with Mickey Thompson 10.5 x 28 slicks. Update: Removed rear sway bar. Installed 165R15 tires in front
Vehicle Weight: typically about 3775 pounds in race trim with driver. Update: With listed weight saving steps, weight with driver is approximately 3750 in race trim


Performance: At Texas Multiplex, Ennis, Texas, on April 19, 1998: 1/4 e.t. was 11.86 seconds @ 112.9 mph, 1/8 time was 7.53 seconds @ 91.3 mph, 60' time was 1.69 seconds. Conditions: a typical Texas spring day with 75 degree temperature and moderate humidity. BP = 30.05. Note: Runs made with a stock cast iron intake manifold. Performance Update: Following runs made with RPM manifold: Houston Raceway Park, December 6, 1998; 11.76 @114.56, 1/8th mile times wer 7.48 @ 92.48, 60' time was 1.68 seconds. Cedar Creek Dragway, November 14, 1998; 1/8th mile, 7.39@ 92.14, 60' time was 1.60 seconds


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