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From Sallee Chevrolet. http://www.sallee-chevrolet.com/PriceList/group2.041-3.726.html

01103952 - Distributor, Late model HEI F/I, small cap. This complete distributor is used on late model V8 engines with fuel injection and computer controls. = 168.92 ( Does not say hardened gear or for roller cams )

01104060 - SBC Distributor Assembly, for Ram Jet 350. This complete distributor is used on the Ram Jet 350 port fuel injection engine. - 176.09 (RJ350 has a roller cam, but does not say this has hardened gear. so what is the diff. in this one and the one above? )

01104067 - HEI HO Distributor. This distributor has the melonized cam drive gear P/N 10456413 for steel roller camshafts. This distributor is required on all crate engines and roller camshafts that are made of steel. If engines are assembled not using this gear, it may affect your engine warranty. Use connector wire P/N 8917052 to ignition. Used with all small and big-block V8 High Output engine assemblies. Technical Notes: Components in these groups are interchangeable with small-block Chevrolet V8s. GM Performance Parts distributors cannot be used with "tall deck" Bow Tie block P/N 14044808. - 227.41 ( only one that says it's for roller cams, but this is a large cap HEI ).


10456413 - Distributor HEI Gear, large cap. You must use this gear with the new roller cams. This is a hardened gear. This distributor gear is used on all Chevrolet small and big-block engines, including steel roller camshaft engines. - 22.88

10469459 - Distributor HEI Gear, small cap. You must use this gear with the new roller cams. This is a hardened gear. Also fits some Mallory distributors. - 23.74
The bottom of a Chevrolet distributor housing can be and SHOULD BE! modified to spray pressurized oil onto the distributor drive gear. The extra lubrication will reduce distributor gear and camshaft gear wear. This is especially important when the gear is used to drive non-standard accessories, such as a high volume oil pump, or a magneto that puts additional loads on it and the cam. <P>When the distributor is installed, the bands at the bottom of the housing are designed to complete the internal right side lifter galley on all small and big block Chevrolet V-8’s and 90° V-6 engines. If you hand file a small vertical groove .030" wide x .030 thats the diam. that crane recommends Ive always used the larger .050 wide groove with no problems, deep on the bottom band (above the gear), pressurized oil running between the two bands will be directed downward onto both the gear and the cam This procedure is recommended for all Chevrolet engines no matter what material gear (cast or bronze) or what type of camshaft (cast or steel) you are using
keep in mind the groove MUST be lined up with the cam gear when the distrib. is installed
 
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