[PeteLeathersac]

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Best confirm but if any help, most online info notes ‘66 L72 Pulley #’s as list below from this link…
https://www.detroitautomotiverestora...7-425hp-engine

~ Pete

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‘66 L72…
To complete the L72 engine package, below are the other unique parts for this engine (Some parts like the 3872444 Bell Housing are not shown because they were shared with the L35 396 and the L36 427/390HP engines):
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Distributor (non-transistorized) - 1111100
Carburetor Intake Gasket - 3881847
Air Cleaner, Dual Snorkel - 6421970
Air Cleaner Decal, 427 Flag - 3874904
Air Cleaner Decal, Horsepower Banner, TurboJet 425HP - 3880870
Air Cleaner Stud - 3869954
Air Cleaner Vent Elbow - 3868842
Air Cleaner Vent Hose - 3846122
Flame Arrestor - 3849856
Camshaft - 3863143
Pistons (11.0:1) - Standard - 3888342 - 0.030 over - 3888344
Crankshaft - 3869952, Casting # 6223
Oil Pump - 3876868 ( Replaced by 3904826)
Oil Pump Drive Shaft - 3865886
Vacuum Advance - 1115360
Vacuum Advance Tube - 3877640
Intake Manifold Gasket Kit - 3955527 (for Rectangular Port Heads)
8" Harmonic Balancer - 3860010
Timing Chain Cover - 3975941
Fuel Pump - 6416459 (AC Number 40358)
Fuel Lines - Pump to Tee: 3886151, Tee Block: 3886153, From Tee to Carb: 3886152
Valve Covers (Drippers) - 3877631 (LH), 3877632 (RH)
PCV Valve - 6423438 (CV691C)
PCV Hose - 3871298
PCV Hose Clip (at Base of Carb) - 3846117
Choke Coil - 3887148
Choke Rod - 3885070
Idler Pulley Bracket - 3878226
Water Pump Pulley - 3864480
Crank Pulley - 3869978 (casting number)
Alternator Pulley - 3844100
Alternator Fan - 3843346
Exhaust Pipe (LH) - 3866523
Exhaust Pipe (RH) - 3866524
Muffler (LH) - 3928215
Muffler (RH) - 3884800
Tailpipe (LH) - 3883697
Tailpipe (RH) - 3883698
Tailpipe Hanger (LH) - 3883693
Tailpipe Hanger (RH) - 3883694
Tailpipe Clamps - 1368195
7000 Tachometer (6000 Red Line)- 6412549
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If your L72 had Transistorized Ignition, here are some additional parts that are required
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7000 Tachometer (6000 Red Line) - 6412572
Distributor - 1111074
T.I. Module - 1115005
T.I. Coil - 1115210
42 Amp Alternator - 1100696
T.I. Harnesses, Main: 2988218, Extension: 6287841, Ignition Lead: 2986913


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