Help needed on Y Block distributor??

[BUBBAS IGNITION]

I have a customer needing to convert from the loadamatic ( vac only ) distributor to a mechanical advance style AND his present unit is a spade type drive on the lower end.
What is the first year for the mech advance distributor etc ??????
I have some Y block mallorys but they seem to have the hex oil pump rod drive etc......

[thunderbirdesq]

57 is first year for non-loado dist, Spade drive oil pump is '54 only, you need to rebuild the oil pump with a later kit for hex shaft, use a later hex shaft AND most importantly use the drive gear from his current dist on the new one. It's a different tooth count and will only work with a '54 cam. I did this swap on a '54 239 once. Been a few years, but I got a reman dist for '60 pickup from autozone for like $16. Worked like a charm.

[BUBBAS IGNITION]

Originally Posted by thunderbirdesq

57 is first year for non-loado dist, Spade drive oil pump is '54 only, you need to rebuild the oil pump with a later kit for hex shaft, use a later hex shaft AND most importantly use the drive gear from his current dist on the new one. It's a different tooth count and will only work with a '54 cam. I did this swap on a '54 239 once. Been a few years, but I got a reman dist for '60 pickup from autozone for like $16. Worked like a charm.

Thanks thats what i needed to know , will advise when i get er done........

[LOWRIDER]

If your still running the Holley 94 carb you wont have ported vacuum for your vac. advance. It can be modified but requires some drilling to the base. You can always run manifold vacuum to it if thats your choice.

[BUBBAS IGNITION]

Originally Posted by lowrider

if your still running the holley 94 carb you wont have ported vacuum for your vac. Advance. It can be modified but requires some drilling to the base. You can always run manifold vacuum to it if thats your choice.

that doesnt work very well as the loadamatic is adjusted in venturi vacuum and is very low vac ( lower than 3 inches ) .
Makes it almost impossible to adjust.
Full mechanical is the easier method to work with.....

[GREENBIRD56]

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Bubba - I think what Lowrider is refering to is that if you convert one of the early setups to a later dual advance set-up (mechanical plus vacuum) - the early carb won't have a timed port, it will either have tobe modified or use straight manifold vacuum.

[LOWRIDER]

Originally Posted by GREENBIRD56

Bubba - I think what Lowrider is refering to is that if you convert one of the early setups to a later dual advance set-up (mechanical plus vacuum) - the early carb won't have a timed port, it will either have tobe modified or use straight manifold vacuum.

Yes, thats what I was referring to.

[Y-Blockhead]

How to modify a Holley 94/2100 for vacuum advance... http://bit.ly/JA0h83

[BUBBAS IGNITION]

Originally Posted by LOWRIDER

Yes, thats what I was referring to.

Got it , thanks for the info.....

[scicala]

You Da'Man Yblockhead .