Here is a list of engine codes for T1 blocks, credit to thesamba.
Type 1
Code Year Engine/Notes
1- Pre-Jan., 1956 25hp/36hp
1- prefix indicates Type 1 and is not part of the sequential engine number.
2, 3, 4, 5, 6, 7, 8, 9 55-65 1200cc, 36hp/40hp
D0 1966/67 1200cc
F0 1966/67 1300cc
H0 1967 1500cc
F1 1967 40hp
E0 1967 M240 low compression 37hp
L0 1967 M240 low compression 40hp
H5 1968/69 1500cc
B6 1970 1600cc - dual relief, single port
AB 1971/73 1300cc - dual port
AE 1971/72 1600cc - dual relief, dual port
AH 1973/74 1600cc - 8mm head studs with case savers
AJ 1975-1979 1600cc - fuel injected
Type 2
Code Year Engine/Notes
20- Pre-Jan., 1956 25hp/36hp
20- prefix indicates Type 2 and is not part of the sequential engine number.
2, 3, 4, 5, 6, 7, 8, 9 55-65 1200cc, 36hp/40hp
O 1963/64 1500cc - no cam bearings
H 1965 1500cc
HO 1966/67 1500cc
L0 1967 M240 low compression
B5 1968/69 1600cc - single relief
B5 1970 1600cc - dual relief
AE 1971 1600cc
CB 1972/73 1700cc - dual carb., manual transmission
CD 1973 1700cc - dual carb., automatic transmission
AW 1973/74 1800cc - dual carb.
AW 1975 1800cc - fuel-injected
AP 1974/75 1800cc - European only
ED 1975 1800cc
GD 1976/77 2000cc
CJ 1976-1979 2000cc - European only
GE 1978/79 2000cc
CU 1980-1983 2000cc - Vanagon style
CV 1980-1983 2000cc - Vanagon style
Type 3
Code Year Engine/Notes
O 1961-65 1500cc
K0 1966-1972 1500cc - 54hp
M0 1966-1972 1500cc - M240 low compression 52hp
P0 1966/67 1600cc - M240 low compression 50hp
T0 1966-1973 1600cc
U0 1968-1973 1600cc - fuel injected for USA
U0 1970 1600cc - dual-relief case
U5 1971-1973 1600cc - 7.7:1 compression - US/Canada M239 California fuel-injection
X 1972 1600cc - 7.3:1 compression - California
Type 4
Code Year Engine/Notes
V 1969 1700cc - 68hp
Z 1969/70 1700cc - 7.8:1 compression - 68hp, dual carb., automatic transmission
W 1971 1700cc - 8.2:1 compression - 80hp
EA 1972-1974 1700cc
EB 1973 1700cc - California only, fuel injection
EC 1974 1800cc
AN 1974 1800cc - 8.6:1 compression
AT 1974 1800cc - European only, dual carb.
Porsche 914
Code Year Engine/Notes
W 1970/71 1700cc - 8.2:1 compression - 80hp
EA 1972-1973 1700cc
EB 1973 1700cc - 7.3: compression, California only, fuel injection
EC 1974 1800cc - California only, 7.6:1 compression
AN 1800cc - 8.6:1 compression
GA 1973/74 2000cc - 7.6:1 comporession
GB 1973-1976 2000cc - 8.0:1 compresssion
GC 1975/76 2000cc - 7.6:1 compresssion
V0 1700cc - European-only
1800cc - European-only
2000cc - European-only
Replacement cases
These cases were VW engine cases that were sold from VW but never issued in an actual production vehicle. All are dual-relief cases with 100mm oil passages.
Example:
Information from a 5/73 USA service bulletin issued 5/73:
Engines with the re-manufactured symbol, a letter, a number and ending with X, indicates a VW Exchange engine. Before Oct., 1968 the X was not stamped onto the block.
From April of 1972 Shortblocks were sold with the VW remanufacture symbol followed by a letter. No numbers were used, you were to stamp in the old engine number.
F1 1300/1600
F2 1300/1600
DO 40hp if last digit is "X"
D1 40hp part
AD 1600
AK 1967-1974 1500/1600
AM 1600
AS Sometimes seen listed as Super Beetle case for 1973-onward
Exchange engines
These engines are normally marked with a VW recycle symbol and an X at the end.
Example:
Information from a 5/73 USA service bulletin issued 5/73:
Engines with the re-manufactured symbol, a letter, a number and ending with X, indicates a VW Exchange engine. Before Oct., 1968 the X was not stamped onto the block.
From April of 1972 Shortblocks were sold with the VW remanufacture symbol followed by a letter. No numbers were used, you were to stamp in the old engine number.
