502 Timing - Chevelle Tech
Engine AdvertisementGeneral Engine Discussion.

 
LinkBack Thread Tools Search this Thread Display Modes
post #1 of 3 (permalink) Old Dec 12th, 09, 6:53 AM Thread Starter
Tech Team
Bob
 
Join Date: Mar 2007
Location: Alberta, Canada
Posts: 138
502 Timing

Doing some tuning on 502 crate engine and need some assistance. I see on GM's website they say 36 degrees at 3600 rpm of total timing. What are most of you running for initial timing? The website doesn't say.
sparky502 is offline  
Sponsored Links
Advertisement
 
post #2 of 3 (permalink) Old Dec 12th, 09, 7:29 AM
Lifetime Premium Member
Hank
 
Join Date: Jul 2004
Location: Brighton, MI
Posts: 6,735
Re: 502 Timing

Start with 16-18. The more initial you can get without detonation the better. My 454HO likes 18 initial.

Hank

70 Chevelle SS396(454), M20, 3.73
My Chevelle
Finally is offline  
post #3 of 3 (permalink) Old Dec 12th, 09, 11:38 AM
Senior Tech Team
Dave
 
Join Date: Sep 1998
Location: Sapulpa, OK
Posts: 4,968
Re: 502 Timing

With vacuum advance disconnected, set the total at 36. Then if you let it idle, you'll see that its at or near 16. Be sure the idle speed is slow enough that you're not starting the mechanical curve (around 800-900 should work) "Most" distributors have about 20 of mechanical advance in them, some a little more, some a little less. You adjust the rpm level with springs and bring the total in earlier or later. You can play with weights if needed to get the 20 you'll need. You may also find that you need to limit the vacuum advance depending on your application. There are also adjustable advances and limit cams for this purpose.

Dave Bradley
d1_bradley is offline  
Sponsored Links
Advertisement
 
Reply
Gear in this thread - Powered by O'Reilly Auto Parts

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Chevelle Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address. Note, you will be sent a confirmation request to this address.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools Search this Thread
Show Printable Version Show Printable Version
Email this Page Email this Page
Search this Thread:

Advanced Search
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome