Final Block Assembly
With the heads cleaned up and assembled with fresh hardware,
we are ready to finish the engine. All that remains is
to bolt the heads on the block, lay the intake manifold
in place, and then set up the valvetrain, install the
harmonic balancer and pulleys.
With the heads assembled,
we can bolt them to the block. Small block Ford
head gaskets only have coolant openings at the rear,
the front block openings get covered by the gasket.
Most head gaskets will have the end be marked "FRONT"
on one end. |
World heads, like many other
aftermarket heads, are made to be used on 351W blocks
as well, and therefore are drilled for the larger
windsor headbolts (7/16" thread). To use the
standard 1/2" 289/302 headbolts you'll need
to use these reducer bushings, or get special headbolts
with a 7/16" shoulder and 1/2" thread.
|
Install the headbolts with
silicone sealant on the threads, since they pass
through water passages. Torque the headbolts in
sequence, starting with the center bolts and working
outwards. Step the torque from 50 lb.ft. to 60 lb.ft,
ending with 75 lb.ft. |
Be sure to only use hardened
pushrods with guideplates. Proper pushrod length
will have the roller tip centered on the valve stem
when the valve is at half-lift. For our set-up the
stock 5.0 length pushrod was perfect (6.258").
An adjustable pushrod is the best way to check. |
The roller rockers go on
next. (We're using Harland Sharp 7/16" rollers.)
Based on our cam specs, we'll set the lash at 0.020"
and re-adjust after the engine is broken in. |
Finally the intake goes on.
Ditch the cork endseals and use silicone instead,
its seals flawlessly and allows for precise intake
port sealing. |
The motor is crowned with
the intake manifold. The tall plenum and large runners
will work well with the cam and heads we're running.
|
We'll start off running the
motor with a 750cfm Holley double-pumper carb. In
a future article we'll dial the jetting in at the
track for maximum performance. |
|
 (Installation
and Conclusion) |
| |
|
|
|
|
| Part
I Short Block | | Part
II Induction | | Part
III Installation | | Part
IV Dyno Testing |
| |
|
Build
Specifications
|
| Bore |
4.000" |
| Stroke |
3.000"
|
| Compression
Ratio |
9.4:1 |
| Piston
to Deck Height |
0.005"
below |
| Head
Gasket compressed thickness |
0.038" |
| Head
Mill |
0.030"
(59.5cc) |
| Intake
Mill |
0.020"
per side |
| Piston
to wall clearance |
0.003" |
| Piston
top-ring end gap |
0.026" |
| Main
Bearing clearance |
0.002" |
| Main
cap Stud Torque |
80
ft. lbs. (ARP lube) |
| Rod
Bearing clearance |
0.002" |
| Rod
cap Bolt Torque |
30
ft. lbs (ARP lube) |
| Rod
side clearance |
0.018"
|
| Crank
endplay |
0.004" |
| Head
Bolt Torque |
75
ft. lbs (ARP lube) |
| Piston
to Valve Clearance (0.020" lash, 0.038"
head gasket) |
int.
0.060"
exh. 0.165" |
| Valve
Lash |
int/exh
0.020" cold |
| Valve
Spring installed height |
1.812"
(0.060" hardened shims) |
| Valve
Spring Open Pressure |
145
lbs. (1.272") |
| Valve
Spring Closed Pressure |
354
lbs. (1.812") |
|
|
|
|
400HP
302 Parts List
|
| Short
Block |
1989
5.0 |
| Heads |
World
Windsor Sr. |
| Intake
Manifold |
Edelbrock
Victor Jr. |
| Carburetor |
Holley
750 Double Pumper (0-8156) |
| Cam |
Crane
Solid Roller (44SR00016) |
| Lifters |
Crane
Solid Roller (44542-16) |
| Retainers
/ Locks / Seals |
Crane
(99953-16, |
| Valve
Springs |
Crane
Dual
(99893-16) |
| Pushrods |
Crane
95615-16 (6.750") |
| Roller
Rockers |
Harland
Sharp 1.6:1 (7/16" stud mount) |
| Bearings |
Clevite
77Main , Rod, Cam Bearings (std.) |
| Pistons |
Keith
Black 281 4.00" |
| Piston
Rings |
Hastings
Powerflex 2M5508 4.00" |
| Gaskets |
Detroit
Gasket full set 55611FS
(Fel-Pro 1260 intake)
|
| Main
Studs |
ARP
154-5407 |
| Head
Bolts |
ARP
154-3701 |
| Rod
Bolts |
ARP
"Wavelock" 154-6402 |
| Oil
Pump |
Melling
68HV |
| Oil
Pump Shaft |
Ford
Racing M-6605-A302 |
| Oil
Pickup/Screen |
Clevite |
| Windage
Tray |
Ford
Racing M-6687-A351 |
| Timing
Chain |
Cloyes
True Roller C3057XSP |
| Harmonic
Balancer |
Fluidampr
715221 (50 oz.) |
| Waterpump |
Flowkooler
1681 (aluminum) clockwise rotation |
| Distributor |
1985
Ford Duraspark (steel gear) |
| Ignition |
MSD
6AL |
| Spark
Plugs |
Motorcraft
(0.040" gap) |
| Headers |
Hooker
Super Comp 1 5/8" primary; 3" collector |
| Flywheel |
1989
5.0 (50 oz.) |
| Clutch |
Centerforce
Dual Friction DF920830 |
|
|
| |
|
