BORE & STROKE FIGURES
|
Engine |
Year produced |
Bore |
Stroke |
| 223.4 L-head straight 8 | 1933-1935 | 3 3/16 | 3 1/2 |
| 208 L-head straight 6 | 1935-1936 | 3 3/8 | 3 7/8 |
| 232.3 L-head straight 8 | 1936 | 3.25 | 3.50 |
| 222.7 L-head straight 6 | 1937-1940 | 3 7/16 | 4.00 |
| 248.9 L-head straight 8 | 1937-1949 | 3.25 | 3.75 |
| 239.2 L-head straight 6 | 1941-1954 | 3 9/16 | 4.00 |
| 268.4 L-head straight 8 | 1950-1954 | 3 3/8 | 3.75 |
| INDY FOUR 194.5 (1/2 389) | 1961-1963 | 4.06 | 3.75 |
| 215 overhead valve 6 | 1964-1965 | 3.75 | 3.25 |
| 230 Overhead Cam 6 | 1966-1967 | 3.87 | 3.25 |
| 250 Overhead Cam 6 | 1968-1969 | 3.88 | 3.53 |
| 287 V-8 | 1955 | 3.75 | 3.25 |
| 316 V-8 | 1956 | 3.94 | 3.25 |
| 347 V-8 | 1957 | 3.94 | 3.56 |
| 370 V-8 | 1958 | 4.06 | 3.56 |
|
326 V-8 |
1963-67 |
3.781 |
3.750 |
|
350 V-8 |
1968-77 |
3.875 |
3.750 |
|
389 V-8 |
1959-66 |
4.063 |
3.750 |
|
400 V-8 |
1967-79 |
4.120 |
3.750 |
|
421 V-8 |
1961-66 |
4.094 |
4.000 |
|
428 V-8 |
1967-69 |
4.120 |
4.000 |
|
455 V-8 |
1970-76 |
4.150 |
4.210 |
|
V-8
firing order 6-cylinder Straight
8 |
|
Distributor
|
400
428 455 engine ID
This is a quick block ID
for junk yard hunting, etc. You must find the date
code at the back LH side of the block first. The letter is the month, next 2
digits are the day and the last digit is the year. Here are 2
examples:
A249
code "XE"
A
= January - 24 is the 24th day - and 9 is 1969
The
block is a 69 428.
Another example is:
K109
"WA"
K
= October or November - 10th day - 9 = 1969
The
block is a 70 455 4 bolt.
These
motors usually have a large "70" at the rear of the block.
*Note
- blocks with only 2 mounting holes or pads (for the motor mounts) per side is
from 1969 and older blocks with 5 or 3 mounting holes or pads (for the motor
mounts) per side is from 1970 and newer blocks with 2 freeze plugs per side is
1966 and older blocks with 3 freeze plugs per side is 1967 and newer certain
blocks for 4 bbl carb usage have scallops in the
cylinders at the deck for unshrouding the intake
valves. Most 1967 and earlier
blocks place these scallops at approx
400
|
67 400 FULLSIZE: |
XA XB WA WB WM WN YA YB YC XV YD XU YU YV XC YE XW YF XX YX WD XT WE WY XY XZ YL XH XJ WF |
|
67 GTO 400: |
XM XL WT WW YS XE WS WV YZ YI (RAM AIR) XS YR XP |
|
67 FIREBIRD: |
WZ WU YT (RAM AIR) WQ XN WI |
|
68 FULLSIZE: |
YA XA WA WB YC ZR YE YF XZ XH |
|
68 GTO |
XM WT YS (400 HO) WS YZ (RA I) XS XP (RA II) WY XW |
|
68 FIREBIRD: |
WZ YT (400 HO) WQ YW (RA I) WI XN (RA II) WU XT |
|
69 FULLSIZE: |
WA WD YA YB WB WE YC YD XZ WX XH YF 69 GTO WT YS XM XX (RA III) WS YZ (RA IV) WW XP |
|
69 FIREBIRD: |
WZ YT (RA III) WQ YW (RA III) WH XN |
|
70 FULLSIZE: |
WE YD YB XZ WX XH |
|
70 GTO & FIREBIRD: |
XX XV WT YS (RA III) WS YZ (RA IV) WW XP |
|
71 FULLSIZE: |
WS XX YS |
|
71 GTO, GP & FIREBIRD: |
XX WT WK YS |
|
72 ALL: |
YX YZ ZX WS WK YS YT |
|
73 ALL: |
YP ZK Y4 YX Y1 ZX YZ YT XK ZN WS YF WP Y6 YG YN ZS YY XX X5 Y3 YS XN |
|
77-79 TA 6.6 (W72 option) |
casting number 481988 XX is cast on the valley area and externally |
428
|
67 |
WG YY YH Y2 XD WJ XK YK Y3 |
|
68 |
WG YH WJ YK |
|
69 |
YL YH WG XK XE XJ WJ YK WF XF WL XG |
455
|
70 FULLSIZE: |
YH - 2 BOLT WG XF - 4 BOLT |
|
70 GTO: |
WA YA YC - 4 BOLT |
|
71 FULLSIZE: |
WJ YC WG YG - 2 BOLT |
|
71 OTHERS: |
HO (4 BOLT) WL WC YE |
|
72: |
2 BOLT YH YC YA ZH |
|
72: |
4 BOLT (HO) WM YB WD YE |
|
73: |
YK X7 YD XM WW WT YC XE YA XL ZC ZA (SD) ZJ XD |
|
74: |
Y9 Y4 Y6 A4 Z4 Z6 YY YU YX AU ZU ZX YW ZW YR (SD) W8 Y8 |
|
75: |
YW YU ZU ZW WX |
|
76: |
Y3 Y4 Z3 Z4 Y8 ZB WX |
Service Replacement (SR) blocks do not
always have a code stamped on the front of the engine. They do,
however, usually have a casting number. This casting number is usually on
the RH side of the rear portion of the block - where the transmission bolts up.
Here
they are:
400
castings
|
67 |
9786133 |
|
68 |
9790071 |
|
68 Ram Air |
9792506 |
|
69 |
9790071 |
|
69 Ram Air IV |
9792506 |
|
70 |
9799914 |
|
70 RA IV |
9799915 |
|
71 to 74 |
481988 |
|
75 |
488986 (early) 500557 (late) |
|
76 |
500557 |
|
77 to 79 |
568557 |
|
78 to 79 (TA 6.6) |
481988 xx |
428
castings
|
67 |
9786135 |
|
68 & 69 |
9792968 |
455
castings
|
70 |
9799140 |
|
71 |
483677 (early) 485428 (late) |
|
72 to 74 |
485428 |
|
73 & 74 Super Duty |
490132 |
|
75 & 76 |
500813 |
