Purple Shaft 280/280 cam

to fishy68.
What i am saying is initial timing is not really a performance setting.
YES it will give you all the things you said \\ better mpg \\cleaner plugs\\
smoother idlle.UNDER LIGHT THROTTLE ONLY.
But i am a little confused by your statment that your motor will have spark knock with at anymore then 35 degrees total timing???
Yes i understand your motor suffers from spark knock at 35,but how is hooking up your vacume advance with 18 MORE DEGREES of timing going to take the spark knock away???
Your motor has too much cyilinder presure,thats why you can't go past 35 degrees total.
You said this happens when you run your motor with the distributer vacume advance system not hooked up.(less timing=more knock Please explain, you lost me there.)
I was saying that a motor properly tuned will not need anymore then the total timing set to run really good as far as drag performance goes.
THE WAY YOU HAVE YOUR CAR SET UP WILL BEAT MINE IN THE ECONOMY DEPARTMENT FOR SURE.I am trying to make a faster car and not a gas saver.:) I say that with no disrespect
The part i was saying about the vacume advance when not hooked up can affect your timing at high rpm's(over 5000 grand)is that it does move and is part of the distributers timing system and will affect your timing.
People that run high rpm motors will take the hole vacume canister right off the distributer and put a lock out rod in there.
GO TO MANCINIS SITE AND YOU WILL FIND THIS LOCK OUT DEVICE, EVEN FOR MSD DISRIBUTERS THAT HAVE A VACUME CANISTER.

Everyone knows when they time a stock distributer motor and rev it past 5000 you will see the timing marks start to shake and become not a single line anymore.This is because the stock distributers internal parts start to move and screw with your timing.
When you use a stock distributer ,for a performance DRAG CAR\STREET CAR ,the list of performance improvments go's like this:


1)CHANGE THE ADVANCED WEIGHT SPRINGS \\ JUST LIKE THE MOPAR THE PERFORMANCE DISTRIBUTER.
2)TAKE OFF THE VACUME ADVANCE CANISTER AND LOCK IT OUT.

3)LOCK OUT THE ADVANCE WEIGHTS

4)GET A MSD OR BETTER DISTRIBUTER CAUSE YOU DON'T NEED A FACTORY ONE ANYMORE.

I did not get my info from 30 years ago and i never even talked about what vacume port to hook a vacume advance up to for it to work correctly and yes the shop rags do talk to me and i have a name for each one.:-D

P.s.|||phisy68 waiting for your reply about how more timing helps you with your spark knock:-k
BUY THE WAY I LIKE YOUR CUDA \\IT'S COOL
Everyone has there own way of doing stuff and thats what makes it fun.