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Rocker Arm Ratio:....................................................................................... 1.81:1
Oil Capacity with filter:................................................................................. dry sump
Oil Pressure (Minimum, with hot oil):........................................................... 6 psig @ 1000 RPM
........................................................................................................... 18 psig @ 2000 RPM
........................................................................................................... 24 psig @ 4000 RPM
Recommended Oil:...................................................................................... DEXOS1 5W30 or Mobil1 15W-50
Oil Filter:...................................................................................................... AC Delco part # PF64
Fuel: ........................................................................................................... Premium unleaded-92 (R+M/2)
Maximum Engine Speed:............................................................................ 6600 RPM
Spark Plugs:................................................................................................ Chevrolet 12642722
........................................................................................................... AC Delco # 41-128
Spark Plug Gap:.......................................................................................... 0.037–0.043" (0.95–1.10 mm)
Firing Order:................................................................................................ 1-8-7-2-6-5-4-3
Information may vary with application. All specifications listed are based on the latest production information available at the
time of printing.
LT4 Engine Installation
TITLE
19332703
IR 12AU15
PART NO.
12
40
SHEET
OF
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