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Author Topic: Engines: 400 Horsepower 318 Builds  (Read 20503 times)

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Reggie

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Engines: 400 Horsepower 318 Builds
« on: January 26, 2008, 23:01:44 »

400 Horsepower 318 Builds

Below are the specifications for the infamous "400 HP 318" articles that are often referred to on many Mopar forums. 

"A Parts Book 400 HP 318" - Mopar Muscle - September 2004

This particular combo from an article in Mopar Muscle Magazine made 400 hp at 6,150 RPM and 382 lb/ft peak torque at 4,900 RPM:

  • Block: 1968 Plymouth Barracuda 318 block - zero decked (pistons flush with the block at TDC), line honed
  • Crank: Forged 273 crank
  • Rods: 73-and-up LA connecting rods with ARP rod-bolts.
  • Pistons: Keith Black KB 167 hypereutectic
  • Rings: Federal Mogul pre-gapped moly rings
  • Windage tray: Factory 318 police car windage tray
  • Heads: Magnum heads (59 cc closed chambers, 1.92" intake/1.625" exhaust, 1.6:1 rocker ratio)
  • Head gaskets: .040" head gaskets
  • Compression: 10:1 compression with Magnum heads, zero-deck short-block and .040" head gaskets.
  • Cam: Comp Cams 280H Magnum camshaft, single-pattern, 280* adv. duration, 230* duration @ .050", .512" lift with the 1.6:1 Magnum heads (normally .480" lift with 1.5:1 LA heads).
  • Pushrods: Comp Cams #7960 pushrods (7.650"
  • Intake: Mopar Performance M1 single-plane for Magnum heads
  • Exhaust: TTI 1 5/8" to 1 3/4" step headers
  • Ignition: MSD distributor, box and wires
  • Carburetor: Mighty Demon 750 CFM
  • Carburetor Spacer: Wilson 1-inch tapered spacer
  • Engine oil: Royal Purple 10w-30

"Junkyard Jewel: 400 HP 318" - Hot Rod - April 2003

This particular combo from a Hot Rod Magazine article made 406 hp at 5,900 RPM and 408 lb/ft peak torque at 4,700 RPM. This engine already had over 220,000 miles on it when the test was done. New rings and bearings were done at 120,000 miles.

  • Block: 1984 Dodge Diplomat police car 318 short block with around 220,000 miles. Pistons were 0.058" below deck.
  • Crank: Factory stock 318 crank
  • Rods: Factory stock 318 connecting rods.
  • Pistons: Factory stock 318 police hypereutectic pistons
  • Rings: Unknown brand moly rings - redone at 100,000 miles
  • Windage tray: Factory 318 police car windage tray
  • Heads: 4323302 castings, usually found on 1985 to 1991 318 2-barrel Fifth Avenues, Diplomats, Gran Furys, and Dodge pickups and vans. Stock chamber volume is 59 cc. The following head work was done:
    • Milled 0.050" reducing chamber volume to 52cc and raising the compression ratio to just under 10.0:1.
    • Machined to add 2.02/1.60 Milodon street valves
    • Fully ported, including gasket matching intake port runners to 360 size, and gasket matching exhaust runners to Fel-Pro header gasket size
  • Head gaskets: Mopar Performance P4349557 thin head gaskets
  • Compression: Slightly under 10:1 compression with milled 302 heads, factory pistons and Mopar Performance P4349557 head gaskets.
  • Cam: Comp Cams Xtreme Energy 268 camshaft, 224*/230* .050", 110-degree LSA, .477"/.480" lift
  • Pushrods: Unknown
  • Intake: Edelbrock 7576 Performer RPM AirGap
  • Exhaust: Hooker 5901 1 5/8" 4 into 1 headers
  • Ignition: Mopar factory spec electronic ignition
  • Carburetor: Holley 650 double-pumper core, ProForm 67100C main body
  • Carburetor Spacer: PAW TDP-2084 1-inch open spacer
  • Engine oil: Unknown

Related Topic:


Notes:

  • Despite all of the modifications to these engines, the torque figures for both builds were lower than that of a basically stock Dodge Magnum 5.9 (360) engine baseline dyno test done for a Mopar Muscle article (Magnum Muscle: Serious Bolt-On Power For Magnum Mills). The camshaft was the stock factory 5.9 cam used in Dodge trucks. The only modifications to the 5.9 were bolt-ons; a Mopar M1 single plane intake, a Barry Grant Mighty Demon 750 CFM carburetor and TTI headers. The 5.9 produced 345 HP at 4,600 RPM and 426 lb/ft of torque at 3,800 RPM - an average of 1,000 RPM lower than both 318 builds.

Sources:


« Last Edit: February 02, 2008, 15:21:37 by Reggie »
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