CYLINDER
BLOCK
| Overbore |
090" maximum for early blocks
(identified by two expansion plugs per side) and
060" maximum for late blocks (identified by
three expansion plugs per side) |
| Cylinder finish |
Consult ring manufacturer |
| Cylinder bore |
.0006' maximum out-of-round and/or taper |
| Deck height |
+ .002" corner to corner
variation |
| Deck surface |
Flat within .002" |
| Align bore |
Straight within .001", 3.1885 +
.0005" bore diameter for 3.000" blocks,
3.4385' + .0005" for 3.2500"
blocks |
|
CRANKSHAFT
| Undersize |
.020" maximum for racing engines,
.040" maximum for street engines |
| Measurement |
2.9995" + .0005" for 3.000"
mains, 3.2495" + .0005" for 3.250
mains, 2.2492" + .0005" all rods. |
| Thrust |
.0035 - .0090" end play, 1.130"
width for 3.00" mains, 1.190" width for
3.250" mains |
| Stroke |
Within .003" of stock specification |
| Index |
Within 1 degree, all throws |
| Balance |
Stock is externally assymetrical in
flywheel/flexplate, can be balanced internally if
lighter then stock parts are substitued. Welding
of counterweights NOT recommended. |
|
BEARINGS
|
| CLEARENCE |
3.000 Mains |
3.250 Mains |
All Rods |
| Stock clearance |
.0002 - .001" |
.0005 - .001" |
.0005 - .001 |
| Ram Air/Super Duty |
.0015 - .0034" |
.0010 - .0026" |
.0013 - .0033" |
| Drag race only |
.0025 - .0031" |
.0025 - .0035" |
.0020 - .0035" |
|
PISTONS
| Piston-to-wall Nominal Clearence |
1959-1965 389 cast .001" , 1966-1967
389/400 cast .0025" , 1968-1971 350/400 cast
.0028" , 1972-1976 350/455 cast .0033"
, 1977-1979 400 cast .0029" , 1968-1970 Ram
Air forged .0058" , 1973-1974 Super Duty
forged .0064" |
| Top Ring gap |
326/389 .021 + .005" , 350/400
.019 + .010", -.005" , 428/455
.021 + .010", -.005" |
| Second Ring gap |
.015" + .010", -.005" |
| Oil Ring gap |
.030" + .020", -.015" |
| Ring-to-groove |
.0015" -.005" |
| Piston-to-head |
.030" with steel rods, .040" with
aluminum rods |
| Piston-to-valvue |
.100" minimum intake, .125" minimum
exhaust. |
| Pin fit |
.0006" + .0001" slip fit in
piston |
|
CONNECTING
RODS
| Center-to-Center |
6.635" |
| Bearing hole |
2.3745" - 2.3750" |
| Pin Hole |
.09789" + .0004"
(.0012" + .0004" press fit with pin)
.09810" + .0002" (full floating) |
| Side Clearance |
326/389 .017" + .005" ,
421/428 .016" + .004" , 400/455
.014" + .002" , 1963 Super Duty
.032" + .002" , 1973-74 Super
Duty .023" + .004" |
|
VALVES
| Intake seats |
1.88", 1.92", 2.11" 30 degree
seat, 29 degree face, 060" +
.015" width. 1.96", 2.11" 455 SD
45 degree seat, 44 degree face, .060" +
.015" width. |
| Exhaust Seats |
45 degree seat, 44 degree face, .060" +
.010' width |
| Seat runout |
.002" maximum |
| Stem-to-guide |
Intake .0014 + .0008", exhaust
.0018" + .0008" |
|
OTHER
|
| Valve Lift |
.842" Diameter |
| Lifter-to-bore |
.0020" + .0008" |
| Oil Pump |
.006" + .004" gear-to-plate |
|