Saturday, November 17, 2012

Group 19 Imfo

Hi Bob,
Just thought i'd send you an e-mail regarding some of the info you show on the Group 19 Mallory dual point ignition kits. I've been doing a lot of digging lately as i'm restoring a '70 AMX and I am going for a bit of a 'day 2' feel - torq thrust wheels and some period speed parts in the engine bay. Long story short, I'm going the mallory route for distributor and coil.
About a year ago, a guy had a complete 448 7901 (with mechanical tach drive) for sale on e-bay ($1500 and no bids). Best thing was, he included really good images of all the items included. The distributor, 'coil' (its labeled as a 'transformer') and the street/strip switch are all identified as 'Rev-Pol Mark II' items and the dist tag,coil tag and street/strip faceplate are blue. The mallory part numbers are:
Distributor - ZC564AM (with mech tach drive) - I don't have the non-tach drive part number but the 3 digits would be different as that was how Mallory identified the different castings. ZC makes it a vacuum advance model - which it was, and the parts book diagram shows it that way as well. Mallory used YC on models with no vacuum advance. I was kinds surprised that AMC went the ZC way as 'no vaccum advance' was usually the way racers would go.
Distributor Cap - 4001 - was the part number for the complete 3 piece cap assembly. You can find these on e-bay (NOS for 'stupid' money!) and i'm sure at swap meets. There is a more traditional style of cap available for ZC's and YC's - I don't know if Mallory ever offered it - but Napa Echlin shows the MA5 (vented) and MA9 (non-vented) but i think they are starting to get a bit harder to find - i just ordered one of each and they were the last ones in the US warehouse.
Transformer (coil) - 28675A - so it has an added letter 'A' and it is identified as a transformer, not as a coil. So technically, it wasn't a Voltmaster, even though the case is identical. The case got a lot of use, I've got a copy of a Mallory bulletin from the mid-fifties that shows it as a Magspark Transformer and near the end of it's use there was even an 'Electronic' version.
Street/Strip Switch - 28700 - from what i have read, when you switched to 'strip', it would bypass the ballast resistor and supply full juice to the distributor. They also said not to use it all the time as it would fry the points.
Ballast Resistor - 700 - this is the new Mallory part number, i don't know if it is exactly the same but sure looks to be.
Condenser - 25010 - this is the original brass case one that isn't produced anymore.
To add to the confusion the 'Double-Life' distributor is basically a twin of the Rev-Pol, simply put, it's basically the way it's wired that makes it different. They both have dual points that operate on a 4 lobe cam in the distributor (thus the name 'double-life as the points only worked half the amount versus single points).
I've managed to find a used AMC Double-Life YC531HP (non-mech tach drive, no vacuum advance) that is in reasonable shape. To cover off replacement parts i bought a complete NOS big block Buick Double Life for $99 - everything except housing/shaft interchange. I really like the look of these vintage pieces, though i will more than likely convert it using an Ignitor II as that will work with the Voltmaster coil.
Hope this is of some help.
Colin Hillyard

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