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Old 03-08-2012, 04:56 PM
newbe
 
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timing on motor

is there a difference in the timing on a chevy 350 and a chevy 400 small blocks??????
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Old 03-08-2012, 05:04 PM
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There is ignition timing and there is camshaft timing. I assume you're talking about ignition timing. There may have been small differences in ignition timing from the factory, but most all us guys put 10-12 in at the crank with the remainder of centrifugal all in by 2800-3000 rpm's. The combustion chamber shape will make a difference. If you have an large 76cc chamber, it will take longer for the flame front to get from the plug to all areas of the chamber, so you might want to start the fire a little earlier and use a total of 36-38 degrees initial and centrifugal. A later head, like the 64cc fast burn chambers, will want a little less total ignition lead, more like 34 degrees.
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Old 03-08-2012, 05:14 PM
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ok im new to building a motor. I got a 400 small block switching it with a 350. it all togther and found out i needed the 168 tooth fly wheel for it and me and my dad wasnt sure if theres a difference in the timing to get it to run correct
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Old 03-08-2012, 06:14 PM
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There are two areas of putting the motor together that seem to draw a great deal of attention on this board.
1. valve adjustment
2. ignition timing
Here's some help for you....
http://www.crankshaftcoalition.com/w...stment_SBC/BBC
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Old 03-08-2012, 06:46 PM
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Quote:
Originally Posted by techinspector1
There is ignition timing and there is camshaft timing. I assume you're talking about ignition timing. There may have been small differences in ignition timing from the factory, but most all us guys put 10-12 in at the crank with the remainder of centrifugal all in by 2800-3000 rpm's. The combustion chamber shape will make a difference. If you have an large 76cc chamber, it will take longer for the flame front to get from the plug to all areas of the chamber, so you might want to start the fire a little earlier and use a total of 36-38 degrees initial and centrifugal. A later head, like the 64cc fast burn chambers, will want a little less total ignition lead, more like 34 degrees.
Thats a great little tidbit of info.
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