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Topic: Suggestions for timing on 383

in Forum: C3 Engines

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Suggestions for timing on 383

Posted: 11/17/07 6:03pm Message 1 of 4
neuroclast
Former Member
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Charleston AFB, SC - USA
Joined: 10/31/2007
Posts: 111
Vette(s): 1979 Cream Beige Coupe w/383 & 700R4
Well, I just set the timing on my 383 because it's been running funny. Looked a bit off. I set it according to a lot of writeups, 16 initial and 36 after centrifugal. I also moved my vacuum advance from port vacuum to manifold vacuum as the writeup suggested.
 
My main question is this: I have a HEI dist, it had black/gold springs in there as it was. My problem was with that combo it was opening at my idle speed of ~750. I changed it to black/black but now it's taking till about 3500 to come all in, where the writeup says it should be all in by 2500-3000 for best performance. Is what I have now acceptable, or what can I do to get it to come all in from OVER 750 but before 3000?
 
Btw no pinging or anything, car is running great if not better than before.
 
Thanks
-Josh



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Suggestions for timing on 383

Posted: 11/17/07 9:08pm Message 2 of 4
rearn2go72
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Bladenboro, NC - USA
Joined: 1/22/2006
Posts: 1058
Vette(s): 1972 conv., sunfire yellow, blk interior, blk vinyl and convertible top. Off frame restoration with American Speed 383 stroker engine producing 500hp plus a 200hp NOS system. MSD ignition. Hooker super competition headers with chambered exhaust.
Mine is 36 degrees advanced with no vacuum.


Suggestions for timing on 383

Posted: 11/18/07 10:02am Message 3 of 4
neuroclast
Former Member
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Charleston AFB, SC - USA
Joined: 10/31/2007
Posts: 111
Vette(s): 1979 Cream Beige Coupe w/383 & 700R4
What springs are you using to get the centrifugal advance all in above idle and below 3000?


Suggestions for timing on 383

Posted: 11/18/07 8:15pm Message 4 of 4
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lukesvette
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HOWELL, NJ - USA
Joined: 5/18/2004
Posts: 6812
Vette(s): 1979, Targa Blue (72 Color), Pace Car rear spoiler, L88 hood, Dark blue factory interior, 525HP 406, HD 700R4, 370 gears,Steeroids, composite rear spring, TT IIs wrapped in T/A Radials.
Is gold medium or light?
 
A good baseline is a set of medium springs and depending on how soon you come up on full advance, you can lighten up if it's taking longer than you expect of go to the heavier springs if coming on too soon.
 
Depends a lot on your driving habits...



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in Forum: C3 Engines


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