Blueprinting a distributor

I was talking to an old fella and he has worked on tuneups his whole career. He specializes in carbs and distibutors. I have a 51 fleetline with a 216 and I have an edmunds dual intake for holly 94s. I want this old fellow to do my carbs because he has done alot of multi setups but he said that I should bring him my distributor and blueprint it as well. My question is, how do you blueprint a distributor, I see he has a vintage sun machine as well.

 

Distributor blueprinting means verifying at which RPM your advance mechanism kicks in and how far; then performing alterations (springs, advance travel, weights) to suit your engine combo, without any guesswork.

 

Ok so on these old distributors they dont have weights on them how do you bluprint them?

 

PM GMC Bubba

http://www.jalopyjournal.com/forum/group.php?do=discuss&group=&discussionid=419

http://www.jalopyjournal.com/forum/group.php?do=discuss&group=&discussionid=2526

He even has a Class in Feb...

 

Its just your basic tuneup with a little more finess. For it to be blueprinted it would have to be dead nutz factory spec.

 

i check every distributor on my machine before installing

 

They have centrifugal weights, you just can't see them because they're under the point plate.

 

HOTFLINT...and yes they should have weights allready in them. but i would up grade the dist. to h.e.i. from mallory or m.s.d. man you realy don't won't points in your dist. i'am sure the mechanic means well, but technoligy has moved in lightyears. and i don't mean that in a bad way...POP.

 

You can modify a later Chev 250 six cylinder HEI distributor to work. Do some searches on the HAMB, this has been discussed.

 

And more.......this isnt a gm six but prety well describes the process.........

http://www.lindertech.com/bhrs/flathead_crab.htm

We then use the factory chart to "blueprint" the unit.
Sometimes a different curve (advance) is needed based on mods to the car like gear ration, air fuel, camshaft etc......