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NOTE: The flex plate does not use a locating pin for alignment and will not initially seat against the crankshaft flange, but
will be pulled onto the crankshaft by the engine flex plate bolts. This procedure requires a 3 stage tightening process.
1. Install the flex plate to the crankshaft. (figure 6)
2. Apply thread lock to the threads of the flex plate bolts.
3. Install the engine flex plate bolts.
4. Tighten the engine flex plate bolts (1–8) a first pass in sequence to 15 nm (11 lb. ft.).
5. Tighten the engine flex plate bolts (1–8) a second pass in sequence to 30 nm (22 lb. ft.).
6. Tighten the engine flex plate bolts (1–8) a final pass in sequence an additional 30 degrees.
Fig. 6
Pilot Bearing
You must install a pilot bearing in the rear of the crankshaft, if the engine will be used with a manual transmission. The pilot
bearing aligns the transmission input shaft with the crankshaft centerline. A worn or misaligned pilot bearing can cause
shifting problems and rapid clutch wear. There are two different Chevrolet pilot bearings for the LT4. 14061685 is for a long
input shaft transmission and 12557583 is for a short input shaft transmission. Verify fit prior to installing the transmission or
damage will occur.
Starter Motor
A starter motor is not provided with the engine. The following parts are designed for the LT4 starting system (Figure 7).
ITEM
DESCRIPTION
1
Shield-starter motor
2
Starter motor
3
Bolt-starter motor
4
Bolt-heat shield
Fig. 7
LT4 Engine Installation
TITLE
PART NUMBER
QUANTITY
12656132
12619241
11610787
11588711
IR 12AU15
1
1
2
3
19332703
PART NO.
8
40
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