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Mechanical Advance
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Posted: 12/01/08
08:45 PM
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I just put a MSD Off-Road ignition in my truck with a 350, should I increase the rate of advance with some springs and bumpstops? 
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SnoMan
Addict
| Posts: 2005
| Joined: 03/08
Posted: 12/01/08
10:09 PM
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Depending on cam, CR and fuel octane in use as it would determine how fast to bring curve up and what its total limit should be. Generally a stock SB with proper fuel for it CR likes about 38 degrees of total advance (static and mechanical) by about 3800 RPM or a bit less.
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Posted: 12/02/08
11:25 AM
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O.K. thanks for the info. Also, how can I find out my compression ratio, are stock 350's all the same? I don't think they are, so I wanted to know the proper method for finding the ratio without taking the engine apart.  Thanks again! 
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SnoMan
Addict
| Posts: 2005
| Joined: 03/08
Posted: 12/02/08
12:09 PM
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It is pretty easy to figure out CR based on engine model year. Using 87 octane will limit total advance too.
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