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Discussion Starter · #1 ·
I am clearly a novice when it comes to timing issues..

My engine is running with a Mallory HEI with the vacuum hose disconnected. The timing @ 3000 rpms is 38 degrees which is perfect. Initial timing is at 25 degrees which I would like lowered about 10 degrees due to idle troubles.

So my question is: How do I do that? How do I lower the initial timing but keep the timing @ 3000 rpms @ 38 degrees? Do I change the springs or what?
Please help.

Thanks for a great forum.
 

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What are your idle troubles?
 

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Springs and weights will change the rate that the centrifugal advance is added.
Bushings determine total centrifugal advance. On my MSD is came with springs and bushings. Not sure on the Mallory. Check their website or find someone who can re-curve the distributor.
FYI I run 18 and 18 for 36 total.

EDIT: I found this on the Mallory website... http://go.mrgasket.com/pdf/29015.pdf
 

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What eville said about arriving at the correct initial/total is the ticket, but I agree, I wonder what exactly your idle issues are, mine is locked out at 35 degrees (no advance, straight 35 always), and it idles smoother than ever. I doubt your initial timing is causing your problem.
 
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