I have recently bought a Mallory Distributor for my Y block (272) and wanted to know a bit more about it.For starters it's a YC336HP, searched the web and found nothing!
I see people with YC311HP, is there much difference?
Any info will be appreciated, thanks. Trev.

I looked at both the #311 and #336 Mallory distributors that are sitting here and they look identical to each other. The distributor caps and breaker points are also the same which seems to be a nuance between some of the other models of Mallory distributors.

Lorena, Texas (South of Waco)

Thanks for checking that out Ted.Could just be the year of production???

Hi Ted, I asked over on the HAMB for info as-well and GMC BUBBA said there could be difference in the drive gear and oil pump shaft.

He also said the 336 is more suited to the 312.

Could you check if there are any differences please? Trev.

Trev. I looked through my stash and find no fewer than (2) #311’s and (5) #336’s. They all have 14 tooth gears and use the standard Y hex shaft for the oil pump. For all intent and purposes, both the 311 and 336 models will fit and work in all 1955 and up Y engines. There are some subtle differences in the housings on all these distributors but that’s likely just a ‘year’ thing during the life of the production run for those distributors. There’s always a chance that there is a difference in the advance curves between the two models but the advance curves in those dizzys were easily changed once the breaker plate was removed so that shouldn’t be a big deal. I've no old Mallory catalogues to reference which might help to discern the actual differences between these two models.

Lorena, Texas (South of Waco)

As Ted suggests it might be, my guess would be the default spring/bushing setup.

Might Mallory have the info about it on file?


Lawrenceville, GA

Thanks for checking them out for me Ted, I really appreciate the effort.
I slotted the old cam in my block with the 336 yesterday and it all turned with no problem, even the old hex rod was a nice tight fit.

Trev.