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Old 05-04-2007, 08:35 PM
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Total Timing

Ok I have a crate motor from Year One. It says the total Timing is 38 degrees. How do I find out what to set the initial timing at?

Engine Specifications:
·Horsepower: 400+
·Torque: 400+ ft/lbs
·Compression ratio: 9.5:1
·Dyno-tested: Yes, includes balancer and 14" flexplate
·Dyno sheet: Included with engine's output
·Vacuum produced: 12hg @ 800RPM
·Recommended fuel: 92 octane
·Max recommended RPM- 6000
·Block: Seasoned 4-bolt iron
·Crankshaft: Nodular iron
·Pistons: Hypereutectic
·Connecting rods: Powdered metal
·Camshaft- Hydraulic roller
·Valve lift:.520"
·Duration @ .050" (int/exh): 218deg/228deg
·Rocker arms: 1.6:1 ratio
·Cylinder heads: Ported Vortec
·Valves: Stainless steel 2.02 int/1.60 exh
·Valve springs: Heavy duty
·Bore x Stroke: 4.030" x 3.48"
·Intake manifold: Dual-plane aluminum
·Oil pan, timing cover, valve covers included
·Engine fasteners: High tensile strength
·Warranty: 12 month/12,000 miles

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Old 05-04-2007, 08:50 PM
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With the vacume advance line disconnected you can connect a timing light, then rev the engine up untill there is not more timing advance and turn the distributor for 38 degrees total, then idle it back down and see where your inital timing ended up. Most engines with a mild street cam like yours will like about 12 degrees initial but it may take some playing around to figure out the best setting. If the inital setting messes up your total advance then you'll need to modify the mechanical advance limit. The amount of mechanical advance can be figured out with the distributor out of the car using a simple protractor just remember the distributor turns half the speed of your crank so double the distributor degrees to get the actual crankshaft numbers.
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Old 05-05-2007, 07:56 PM
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38 degrees of total mechanical timing is actually a lot for a motor with fastburn type heads like the vortecs. I would suggest a timing setting of 31 to 36deg.
Where the initial timing will fall when you set the total to say 34deg total depends on how much mechanical advance travel your distributor has.
A advance type timing light will help when setting up the ignition timing.
I would suggest 12 to 16deg at idle (800-900rpm) with 31 to 36deg at high rpm. Set the timing up with the vacuum advance disconnected, then reconnect it.
Again vortec headed motors when jetted correctly for best power usually need a litle less timing than SBC's with the old style heads. 38 degrees is a lot. probabily too much. If you want to find the best timing setting you can go to your local drag strip and test using different timing settings ( you're looking for best MPH on the time slip. Or have your car dyno tested on a chassis dyno to find the best overall power setting. I would start at 29deg and work up to 36deg. more is not nessessarily better especially with vortec heads.
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