68-69
H=383
P=340
1970
H=340
I see! You meant the 5th digit...
1970 Codes:
First digit = car line
B - Plymouth Barracuda ("E" Body)
C - Chrysler Newport, 300, New Yorker ("C" body)
D - Dodge Polara, Monaco ("C" body)
J - Dodge Challenger ("E" Body)
L - Dodge Dart ("A" Body)
P - Plymouth Fury ("C" body)
R - Plymouth Belvedere, Satellite ("B" body)
V - Plymouth Valiant, Duster ("A" body)
W - Dodge Coronet ("B" body)
X - Dodge Charger ("B" body)
Y - Imperial Crown, LeBaron ("C" body)
Second digit = Price class
E - Economy
L - Low
M - Medium
H - High
P - Premium
S - Special
K - Police
T - Taxi
N - New York Taxi
Third and fourth digits = body style
21 - 2 door sedan or coupe
23 - 2 door hardtop
27 - Convertible
29 - 2 door sports hardtop
41 - 4 door sedan
43 - 4 door hardtop
45 - 6 passenger station wagon
46 - 9 passenger station wagon
Fifth digit = engine
B - 198 1-1BBL 6 Cylinder "G" engine
C - 225 1-1BBL 6 Cylinder "RG" engine
E - Special Order 6 Cylinder engine
G - 318 1-2BBL 8 Cylinder "LA" engine
H - 340 1-4BBL 8 Cylinder "LA" engine (High Performance)
J - 340 3-2BBL 8 Cylinder "LA" engine (High Performance)
K - 360 1-2BBL 8 Cylinder "LA" engine
L - 383 1-2BBL 8 Cylinder "B" engine
N - 383 1-4BBL 8 Cylinder "B" engine (High Performance)
R - 426 2-4BBL 8 Cylinder "RB" engine (Hemi)
T - 440 1-4BBL 8 Cylinder "RB" engine
U - 440 1-4BBL 8 Cylinder "RB" engine (High Performance)
V - 440 3-2BBL 8 Cylinder "RB" engine (High Performance)
Z - Special Order 8 Cylinder engine
Sixth digit = model year
0 - 1970
Seventh Digit = Assembly Plant
A - Lynch Road, Michigan
B - Hamtramck, Michigan
C - Jefferson, Michigan
D - Belvedere, Illinois
E - Los Angeles, California
F - Newark, Delaware
G - St. Louis, Missouri
H - New Stanton, Pennsylvania
R - Windsor, Ontario, Canada