Allstar Performance ALL90000 User Manual

Aluminum Gear Drive

1. Allstar gear drive for small block Chevrolet V8’s is the ultimate in precise cam timing. Heat treated
and case hardened gears eliminate timing chain stretch and harmonics. Camshaft and ignition timing
remain accurate at all engine speeds – and that means more horsepower!

2. Cam timing is innitely adjustable to allow maximum performance from any prole. Camshaft for­ward and rearward movements are controlled with needle bearing thrust washers.

3. Gear drive ts under most 2 pc. timing chain covers and the cam and cam gear can be removed
for inspection without dropping the oil pan. Allstar gear drives deliver maximum performance and reli­ability.

• Eliminates Variations In Valve And Ignition Timing

• Controls Camshaft Thrust

• Allows Fine Tuning Cam Timing

• Simplies Inspection And Maintenance

• Gears Can Be Inspected Or Removed Without
Dropping Oil Pan

Gear Drive Kit Contents

Qty. Description

1

1 Cam Gear
1 Crank Gear

4

5

1

1

1

Main Adapter Plate

With Idler Gear Assembly

1/4" Dowel Pins,
(2 = 1" Long, 2 = 1-1/4" Long)
Offset Bushings - 0 Deg.,
1 Deg., 2 Deg., 3 Deg., 4 Deg.
Small Diameter Thrust Bearing
With 1 Thick And 1 Thin Race
Large Diameter Thrust Bearing
With 2 Thin Races
Thrust Plate With 2 Bolts, 2
Spacers, And 10 .005" Shims

Allstar Performance 8300 Lane Dr., Watervliet, MI 49098

Phone: [phone] Fax: [phone] www.allstarperformance.com

Form 1005 Page 1 of 2 Rev. 071012

Installation Instructions

1. Remove front timing chain cover locating dowel pins

with a claw hammer. Extract dowels in same manner

as pulling a nail. Install new dowels (furnished in kit)
so that dowel protrudes 1/2” out from face of block.

Use care driving dowels in place. Be sure they are

straight.

2. Lower oil pan. Place gasket between main adapter
plate and block. Install main adapter plate leaving idler

gear assembly in place. Put all cover bolts in place

and tighten, being sure that the main adapter plate is
seated flat with the block face.

3. Remove crank sprocket and install crank gear. Align
marks on crank and idler gear.

4. Shorten dowel pin in camshaft so that it does not

protrude beyond flange face of cam gear if using fuel

pump drive.

5. Coat small diameter needle thrust bearing and thrust

washers with a heavy grease, and install on back

of cam gear (washers must be on both sides of the
bearing). Install cam gear on cam using concentric

bushing. Install cam in block, using extreme caution to

prevent thrust bearing and washers on cam gear from
falling out of place. Align marks on cam and idler gear.
Caution: the thick thrust washer must be installed after
the thin washer on the bearing. See drawing.

6. Once all gears have been installed, degree the cam­shaft according to the manufacturer’s specifications.
Coarse adjustment of the timing can be made by index­ing the cam gear one tooth. This is equal to 10.28 cam­shaft degrees. Fine adjustment can be made by install­ing the concentric or eccentric bushings in a centered,
advanced, or retarded position. Bushings install from
rear of gear. Do not assume that timing is correct with­out checking with a dial indicator and a degree wheel.

7. Loosen the three idler gear retaining bolts. Using

a dial indicator, adjust between .006" and .008" total

backlash between the idler gear and the crank gear.

Once backlash is adjusted, tighten the three idler gear

retaining bolts to lock placement of idler gear then
remove each of the three idler gear retaining bolts

(one at a time) apply Loctite to threads and re-install.

8. Coat the large diameter thrust bearing and two thrust

washers with a heavy grease and install in front of the

cam gear. The washers must be on both sides of the
bearing. Caution: Be careful the front washer does not
fall out of place.

9.

Install the cam thrust plate on the main adapter with

the countersunk holes facing away from the block.

Put one spacer ring and five spacer shims on each
side between the main adapter plate and thrust plate.
Check cam end thrust using a dial indicator. Install or
remove shims to arrive at a total end thrust of .002 preload

to .002 clearance. Use Loctite on the two mounting bolts.

Allstar Performance 8300 Lane Dr., Watervliet, MI 49098

Phone: [phone] Fax: [phone] www.allstarperformance.com

Form 1005 Page 2 of 2 Rev. 071012