You had anwsered in one of my posts you were using a light spring and a heavy spring in the dizzy you were using for towing, I have a bunch of springs, im using a black spring and the original spring which came with the distro ( is is a bit long so it doesnt come in all at once), which springs are you using ?. thanks - jav.

 

Bump! Is this thing on?

 

the whole place has been a lil slow ???? flu ??? I got it I'm here... hot toddies and all LMAO!!!

 

Was out to the coast for a Fire Commissioners Conference ysterday and today. When I recurved, I first went to the 13° advance curve from the stock 18°. Would have go shorter but couldn't fine the 10° one I have somewhere. Tried to light springs in my kit (they are lighter than the stock light spring), but the advance was all in by 2500 and it rattle like crazy when towing, but it mpg'd well. The replaced one light spring with a the stock light spring and adjusted tension until max mechanical timing was 3500. You can adjust spring tension by bending the spring post to adjust the tension.

 

Thanks for the responce, That gives me a place to start

 

Well it's been an exciting few day's, I have replaced the 2v manifold on my 66 f100's 352 with a performer intake , Holley 1850 600 and 1 inch transdapt swirl spacer. I recurved the distro using the 10 slot and set the springs to full mech advance at 3500 RPM. I set inital at 16 BTDC and added 8 degrees of vacuum advance run on the ported outlet on the carb, after some burn in runs I have settled on #64 primary jets and a 7.5 powervalve with a orange cam set in the #1 pos. I can now do something I could never do befor, actually spin the tires from a standing start. , This is pretty good for a 8 something to 1 comp motor with a c6 and a 3.07 dana 44 locker rear with 29 inch tires. So all in all a pretty good improvment. I think im over carburated for this motor a 600 cmf, but I will be building a 390 in the future ( got the bug now ) and will want the 600 for that. For now would it be better to modifi the vacuum advance secondary to limit the amount the plates open to lower the CMF to say around 450 cmf ?
It would be easy to do and about that distro curve.
I run 55mph at 2100 RPM and 70MPH at around 2500 rpm, is this curve the right one for both performance and towing ?

Thanks - Jav

 

You can't do both at once. So the towing curve is what you have to live with if you are going to tow. Something you might do to help the mph is add in a bit extra vacuum advance, say 6° more. If this were a preformance set up only, the mechanical curve would be in by 2500 but then you wouldn't have 3.07 rearend either, it's not really good for towing either. Back in the day when I was racing FEs still, there was a trick with the dual point dist. You have 44° to 46° total mechanical advance available (racing/preformance it was in by 2500) in the lower gears and then only have 38° (damn we had good gas back then) in high gear so you wouldn't ping the motor to death. Holley makes a spring kit for the secondary vacuum unit to slow down the opening rate and even prevent them from opening all the way. The spring kit is part number 20-13 which will have 7 different springs to fine tune with.

 

I installed the taller gears to get better mpg on the highway, I only tow my bassboat which weighs around 3200 lbs loaded, it actually towed pretty good with the 2 barrol and old manifold, havent towed with this setup but it should be better. I also have seen a kit number 20-99 that has an adjustable ****
to limit the amount the secondarys open, it's for Braket raceing but the prencible would work for my applacation.
Should I get a heaver spring to delay the secondarys or just experament to see what happens.

BTW I sure apperate your help., - jav

 

Holley has good Tech Service and their on line Tech service will anwser most questions. Try here;

http://www.holley.com/TechService/

and here.

http://www.holley.com/TechService/FAQ.asp