Below on Left (driver) side, front of block just under cylinder head.
W = Windsor, Ontario Plant (318-340-360).
P = Premium Fuel Recommended. ✠ = .001″ Undersized Crankshaft Journals (Oversized Bearings)
Decoding Additional Symbols & Stampings:
A = .020″ Oversized Cylinder Bore
B = .010″ Undersized Main & Rod Bearings (Oversized Bearings)
C = Special Crankshaft & Pistons
E = Cast Crankshaft
H = Standard 4 Barrel Carb
HP = High Performance
LC = Low Compression
OS = .005″ Oversized Valve Stems
P = Premium Fuel Recommended
S = Service Engine (found on Warranty Blocks)
sP = Special Engine use Premium Fuel (found on T/A 340 Engines)
WT or
TW = Water Tested (normally found on Hemi’s & Warranty Blocks)
X = Oversized Valve Guides
2 = Second Shift
♦ = .008″ Oversized Tappets
✠ = .001″ Undersized Crankshaft Journals (Oversized Bearings)
✠+X = .010″ Undersized Crankshaft Journals