viewtopic.php?f=70&t=251&p=7986&hilit=+shiming+distributor#p7986
viewtopic.php?f=70&t=1186&p=4155&hilit=distrib+gears#p4155
viewtopic.php?f=54&t=2187
viewtopic.php?f=54&t=123&p=153&hilit=groove+distributor#p153
viewtopic.php?f=52&t=57&p=70&hilit=groove+distributor#p70
read the linked info
https://www.onedirt.com/tech/engine...fusion-out-of-distributor-gear-compatibility/
Cam gear or distributor gear wear is usually NOT caused by the high volume pump itself, but by insufficient internal engine running clearances.
Chevy V-8's, small block, big block, and 90? V-6 engines, all use splash lubrication to oil the distributor gear. Although higher RPM operation provides sufficient lubrication to prevent wear, low speed use can be a problem. The situation can become critical if a high volume oil pump is used. The high volume oil pump was developed for engines where bearing clearances were increased over stock. These work fine in racing engine applications, where extra clearance is provided in the short-block.
However, when a high volume oil pump is used in an engine with stock internal clearances, the increased volume of oil can't flow through the engine fast enough to relieve the back pressure created. This places an increased load on the distributor gear, and leads to accelerated wear.
Once the gear on either an 8620 steel cam or a cast iron cam is worn excessively, the cam itself must be scrapped! There is no repair for this problem, and the only option is to buy a new cam. To eliminate this annoying and expensive problem, we offer a simple, do-it-yourself way to help oil the distributor gear and reduce this accelerated wear in Chevy V-8 and 90? V-6 engines.
On these engines, the lower portion of the distributor housing drops through the oil gallery that supplies oil to the lifters on the passenger side of the engine. Two rings at the bottom of the distributor housing seal the top and bottom of this galley. Oil flows around the distributor, between the two rings.
Solving distributor gear wear is as simple as filing or machining a .030" groove in the bottom ring of the distributor housing. A three cornered file can also be used.
The distributor housing should be grooved in any engine operated for extended periods at low engine RPM. With the distributor installed in the engine - ready to run - the groove should face TOWARDS THE CAMSHAFT. This will provide a reasonable flow of oil to lubricate and cool the distributor gear and cam gear as they operate.
Remember to keep the groove facing the camshaft, and be sure to use the correct Crane high silicon, copper alloy distributor gear for best results.
Its smart to file a small groove in the lower distributor so oil spray from the oil passage constantly lubricates the distributor gear to cam gar contact point
you might find reading these threads above interesting
STEP #1 is ALWAYS verify TDC and your timing tab and damper reflect REALITY, and if you failed to get the cam degreed in it could be indexed incorrectly causing major problems
a few minutes reading links and sub links will help here!
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viewtopic.php?f=70&t=9921&p=38008#p38008
