GM Performance GM12498772-7 Chev 383 Cu Crate Motor 420Hp

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GM Performance

GM12498772-7
$8,981.50 AUD
$8,981.50 AUD
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GM Performance GM12498772-7 Chev 383 Cu Crate Motor 420Hp

Item Description

  • 4 bolt main 1pc rear seal block with drivers side dipstick only
  • Square and parallel decked
  • Align honed main bearing bore
  • Cylinders honed on computer controlled machine to within .0002" straightness and roundness
  • Cylinders are sonic tested for thickness
  • New cast steel crankshaft
  • Flat top Hypereutectic pistons
  • Chevy heavy beam rods with 150,000 psi bolts
  • Hastings Moly rings
  • Balanced rotating assembly
  • Melling high volume oil pump
  • Flat tappet camshaft
  • Long slot, stamped steel rockers
  • Heavy duty double roller timing set
  • Blue Print aluminium cylinder heads
  • 195cc
  • 1.25" diameter valve springs
  • Hardened retainers and springs
  • 2.02" swirl polished intake valves
  • 1.60" swirl polished exhaust valves
  • Hardened push rods
  • 10 to 1 compression
  • New chrome valve covers
  • Brass freeze plugs
  • Dyno tested - and shipped with results
  • CAM: .480 Int / .486 Exh & 229 Int / 230 Exh duration @ .050
  • Ignition timing: 34 degrees total (at 4000 RPM)
  • This engine requires a 400ci weighted harmonic balancer, and late 350ci weighted flexplate/flywheel.


Manufacturer Information

  • Manufacturer: GM Performance
  • Manufacturer Part Number:
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  • Please Note: Images are for representation only and may differ than the actual product - please contact us if you require an exact photo

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