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Old 01-28-2005, 09:32 AM
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Beginner Question (timming)

I rebuilt my 468 BBC, I have few question

(Sorry for my poor english)

First, there is my spec:

Chevy Nova SS 74 (3500 pounds)
454 bored 0.60 (468 CI) Compression Ratio arount 9.45
Oval port Head (353049) Ported and polish Stage 3
Valve Job 3 angle 2.19-1.88 Manley Severy duty Valves
1.509 Dual Competition Valve Spring (matched to the cam)
Chrome moly Retainer and 10 degre lock (matched to valvetrain)
115 CC chamber (Original Head Shaved 65 thousand)
1.70 full Roller Crane Cam
305 H Hydrolic Radical Cam 575 lift Int/Ext. 305 duration Int/Ext 253 at .050
4.310 Speed Pro hypereuthetic Piston with 0.100 dome 1 valve relief
D.U.I Racing mechanical Distributor
Spark Plug Wires, 409 Pro Race, 10.4 mm
6.135 - 5130 I beam Rod
Scat 4.00 Crank
Everything Balanced and Blueprinted (before head incident)
3500 B&M Stall
19 Thousand Head Gasket
20 thousand Deck
Weiand Team-G 7523 (2,500-7,900 RPM Matched to the head Ported)
750 Mighty demon double pumper
TH350 Transmission with TCI shift Kit
3.73 Rear End (8.5 ten bolts)
Muffler: Flowmaster deltaflow 50 series
Tire:Radial ET Street, 28in.x 11.50in.x 15in #R3754
Landrum Mono-Leaf Spring
Competition Engineering Slide-a-link Traction Bar
Competition Engineering Frame-Connector
Double Timing chain (Comp-Cam)
Weiand Team G aluminum Water pump
4 core radiator (cooper)
Zirgo 3300 CFM electric fan
March pulley and bracket kit (Rod kit - water flow kit)
Moroso Coil Spring (front)
Front-Rear Competition engineering Drag Shocks
Serie 90 Weld wheels, 8 inch rear (4.5 Backspacing) and 5 1/2 front.

My question is: My distributor is calibrated to 14 degres advance at 3000 RPM, My BG asked 20 degre initial timming,

If I run a 91 octan gaz motor, what is the best timming to run this motor, I've heard 34 degres total advance timing?? People have some idea if is wrong or it's prefered to run another total timing.

how I can put 34 degres total timming when I time my car:
if I have 14 degres at 3000 rpm and 20 initial timing, I'M I supposed to put on the electronic timing lamp 34 degres and at 3000 rpm, I will see 0degre on the damper??? (I hope you understand what I want to say)...

(how I'm supposed to time this car with a calibrated distributor (14 degres) if I want to reach 34 or 35 degres with a 20 initial timing??)

Thanks in advance...

Stephane

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Last edited by Ratoflic; 01-28-2005 at 11:06 AM.
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Old 01-28-2005, 11:10 AM
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If you have 20 initial (which seems a bit high) and 14 mechanical (and its in by 3000RPM) then you have 34 total degrees of timing. And yes, using a dial timing light if you set it to 34 and the timing is really at 34, you should see the line at the 0 mark.
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Old 01-28-2005, 11:43 AM
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timming

And for the timming, will 34 degre advance will be enough or perfect for this motor?? (91 pump gaz, 9.45:1 CR) With this Cam 305H hydraulic?

Stephane
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Old 01-28-2005, 03:09 PM
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I'd ask this in the engine forum.
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Old 01-28-2005, 03:27 PM
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total time

A degreed dampener is better than an adjustable timing light for total time. Factory stamped tabs are usually off the mark.

Motor should be 38 degrees total.

You should find exact top dead center of #1 with a dial indicator and mark it on dampener tab when assembling the motor. Now you use your new mark with the degreed dampener and your right on.
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Old 02-01-2005, 03:28 PM
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when your right your right!!!

And this should be in the engine forum. Any further engine related questions should be directed there.


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