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Old 07-02-2012, 04:42 PM
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Timing a 383 stroker

Recently got my motor together and running so I grabbed the timing gun and idle 700 no vac advance hooked up I set it to 8 btdc but it seems to idle a lot better at 10 deg btdc , I'm getting 14-15 deg mechanical advance bringing me to 24-25 deg btdc , and then just give it more and more vac untill I get some pinging an back it off ? I'm running 91 octane and a compression ratio of Aprox 9.25-1

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Old 07-02-2012, 05:17 PM
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What's your total advance with vacuum connected and at what rpm? I'd shoot for 34 to 36 total, around 14 to 16 static. You must have an adjustable vacuum cannister? You may need to limit total mechanical in the dist. If you get detonation, back it down in 2 deg increments.

Hard to give any additional advice without knowing your build, intake, cam, etc.
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Old 07-02-2012, 05:57 PM
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If you've got 15* swing then set the initial at 20* and add the vac adv to full manifold vacuum. Enjoy!
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Old 07-02-2012, 06:04 PM
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Its a 350 .30 over with 3.75 stroke , It's a mild cam 480/488 lift adv duration 260/268 , RHS heads cast iron 2.02-1.60 stainless valves with 1:52 roller tipped rockers , Edelbrock performer intake and 650 carb , long tue headers , 2000 stall and this is on a off road rig 5000lbs 5:38 gears 46 inch tires
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Old 07-02-2012, 06:06 PM
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It gets a lot of 1800rpm - 2200 rpm work exploring trails and logging roads , very little full throttle action
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Old 07-02-2012, 06:16 PM
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I'm kind of confused , retarding the timing is clockwise , when I rev it the timing goes retarded not advanced ? When I set timing to 8 and rev it the mark goes btdc but the weights and vac go advanced so I need total of 32 deg advanced so say 10deg btdc timing mark should move to 22 deg atdc ?
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Old 07-02-2012, 10:31 PM
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Quote:
Originally Posted by jumbo2 View Post
I'm kind of confused , retarding the timing is clockwise , when I rev it the timing goes retarded not advanced ? When I set timing to 8 and rev it the mark goes btdc but the weights and vac go advanced so I need total of 32 deg advanced so say 10deg btdc timing mark should move to 22 deg atdc ?
Uh, what? How does your timing retard at speed? Please explain.
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Old 07-02-2012, 11:22 PM
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When I hold the timing gun on and rev the engine the timing mark moves , when running I can move the dizzy and watch the mark move . When I was putting the engine together I went tdc number one and got exactly 0 on the timing pointer
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Old 07-03-2012, 09:15 AM
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Yes, the timing mark moves when your rpms increase. It is advancing the timing. This is normal operation. I don't understand your problem. If your timing is advancing all you need to do is see how far it advances and what rpm is the max advance and you can tailor your curve from there.
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Old 07-04-2012, 08:14 AM
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if the timing retards when you open the throttle its the vacuum advance dropping out. Do a search on here. Tuning a SBC has been covered about 1.5 million times. It will go through the whole procedure about capping off the vacuum advance and setting the initial based on cam size and then adding x amount of initial to get to a total amount under WOT.
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