Hi All
I recently purchased a parts lot that included this distributor. When I goggled it I found an ad on HAMB describing this as potentially fitting the 303-324 and 371-394 depending on which gear at the bottom is installed.
Can anyone confirm for me that this information is correct? Can you help me identify which gear this has on it? Please check out the photos and let me know if there's any other views that would help key it out. John

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http://www.ebay.com/itm/NOS-Mallory-...22c0ef&vxp=mtr

Here's one for a newer Olds engine 64-90. Notice how short the distance is between the flange that sits on top of the engine is and the gear. Yours is much longer so I'm leaning toward pre 64 for the engine family. I hope that helps.

 

X2 - that is one old unit. They were the distributor to have way back when.

 

Thanks guys. My first step is to identify it and then offer it up for sale. The one on HAMB sold for $250 so I was going to try for that as a shipped price.

John

 

A picture of the bottom of the distributor gear will help. D shaped hole is 324, hexagon shaped hole is 394, I forget which is for 371. I wonder why they plugged the vacuum advance.

 

If my memory hasn't gone bad I believe that a 394 looks like D on the bottom of the distributor gear.Give Toney a call at Ross Racing he would know for sure...Tedd .https://rossracingengines.oursafeserver.com/

 

Sorry Tedd hopefully it is the first thing to go, the 394 definately has a hexagon shaped hole.

 

A 1955 324 distributor looks just like what is shown gear and hole at the end of the shaft and all( i just went out and looked at one I have in the garage) Also there is no windowed cap on that distributor which would also be a 55 or earlier.. In 56 they started windowing the cap for ease of adjusting the points, none is shown on the pictures above. I know this is a Mallory distributor and may not have a windowed cap but the bottom sure looks like a early Olds distributor to me. The distance from flange to bottom of distributor shaft is 6 inches and a 1/16 if that would help I'm trying to down load a picture now but I'm having trouble for some reason but to me it is obvious that it is 55 or earlier distributor.......Tedd

 

49-64 are all the same size distributor, its just the bottom of the gear for driving the oil pump is all that is different. Yep, 6 1/16" is correct. I have the same model distributor but mine is a type 389A not 250B. I still havent cracked the Mallory codes

 

Yep, racerjohnson you are correct after I dug out the 50 year old petrified grease there was the D style hole. Sorry I was so contrary...Tedd