This is a great link regarding traction.
http://www.how-to-build-hotrods.com/tuning-4-link.html

I made it to Atlanta Dragway tonight.  It was a pretty inconclusive night.  No improvement.  In fact, it is slower.
It was very busy and I could only make two passes.  Both times I spun and had to let off, which killed the 60'.  My best run of the night had better 60'-1320' times than previous runs with similar et's, so maybe that means something.  I'm also think it was just spinning easier, which means I need to tackle the traction, and at least get posi before I go back.



Lawrenceville, GA

Haven't been back, yet, just documenting changes since the last run before I loose track.  Hopefully it will be enough little things to get me into the 14s.
No rear gear change, yet. Thought it might be worthwhile to tune some more.

Changed from 20w50 conventional to 15W40 synthetic blend oil.
Installed Innovators West Damper.
Installed smaller diameter water pump pulley.  This one hurts power.
Indexed spark plugs.
Corrected rocker geometry.
Increased secondary jets 2 numbers.
Changed carb spacer from 1/2" divided to 2" 4-hole.
Installed a 14" air cleaner assembly, which does not work with the K&N Stub Stack I have been using.



Lawrenceville, GA

Same tires, same track.  I guess it could be the tach or my memory.



Lawrenceville, GA

Charlie:Have you changed tire sizes since the earlier runs?  That'll change rpm.  Also, were the previous runs at the same track?  Clocks could be set up differently from track to track.

John - "The Hoosier Hurricane"

You forgot and shifted into 5th.

  Dennis in Lititz PA

Tachometer problem?

Frank/Rebop

Bristol, In ( by Elkhart) 

What do you mean?  I was shifting at 5500rpm.  I haven't tried higher but lower and it slows down.One thing I thought was weird is my previous, I was going through the traps at about 6200rpm but last night is was only about 5700rpm.  Since the mph was the same, I don't really get that. 



Lawrenceville, GA

That is great Charlie, what is your rpm limit?

Glen Henderson



Freedom is not Free

Letohatchee, AL

I got a new best tonight, 15.263 @ 91.08mph.  Also a best 1/8th and 60'.  It was busy and I got there late and only got two runs but both were better than before.
The changes since my last best are bringing the total timing in 800rpm sooner and disconnecting and plugging the vacuum advance.  I discovered the vacuum advance trick at Columbus last year but had not yet tried it with higher shiftpoints.  I shift lower at Columbus.Up next is a 4.11 gear.



Lawrenceville, GA