GEAR DRIVE INSTALLATION INSTRUCTIONS

APPLICATION GUIDE
20310, 20311 Chevrolet Small Block Engines:
V6 200, 229, 262 V8 262, 265,267,283,302,305,307,327,350L,400 (Except with Factory Roller Cam)

20315, 20316 Chevrolet Small Block Engines: (with Factory Roller Cam) V6 262 V8 305,350

20320, 20321 Chevrolet Big Block Engines: V8 396, 400, 402, 427, 454

20325, 20326 Chevrolet Big Block Gen VI Engines: V8 454, 502

20360, 20361 Chrysler Big Block Engines: (with 3 Bolt Cam) V8 383, 400, 413, 426 Hemi

20330, 20331 Pontiac Engines: V8 287, 316, 326, 347, 350M, 350P, 370, 389, 400, 421, 428, 455

20340, 20341 Ford Small Block Engines: V8 289, 302, 5.0L 302 H/O, 351 Windsor, 351W H/O

20345, 20346 Ford Engines: V8 351C, (2BBL & 4BBL), 351M, 400

20350, 20351 Ford Big Block Engines: V8 429, 460

1. Remove stock timing cover. Rotate engine to top dead center of cylinder #1 so that the timing marks on the original crank and cam sprockets are directly lined up with each other, i.e. the mark on the crank sprocket will be at 12 o’clock (straight up) and the mark on the cam sprocket will be at 6 o’clock (straight down).
2. Remove sprockets and chain.
3. Install desired offset bushing from enclosed set. Set selection provides 0-Gray, 2-Gold, 4-Copper, 6-Silver, 8-Black, Camshaft Degree Options.
4. Install cam and crank gears.
5. Torque enclosed cam bolts with washers to the factory spec of 21 ft/lbs.
6. Bend lock plate tabs over bolt heads to lock cam bolts.
7. Install camshaft thrust bearing assembly.
8. CAMSHAFT THRUST BEARING COVER CLEARANCE TEST With camshaft endplay at max rearward travel, place clearance putty over front face of the camshaft thrust bearing assembly. Install timing cover with gasket. Hand tighten cover bolts. Remove cover and check putty.
9. Grind camshaft thrust bearing face as to provide the required .005”-.010” endplay clearance.
10. Install dog bone idler assembly as in figure 1.

Notes: Power Idler (large gear) must be installed on left hand side as shown (when you are facing engine). Crankshaft gear will force Power Idler (large gear) into tight mesh with camshaft gear as crankshaft rotates clockwise. Reverse Idler (small gear) should have free vertical movement of .005”- .075” when drive idler gear is in solid mesh with cam and crank gears.

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