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Old 02-19-2013, 10:19 AM   #1
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Default 1984 el camino

Hi Guys, I have a 1984 El Camino with a 350 vortec crate motor, 650 cfm edelbrock, 350 turbo trans, shift kit, 323 posi rear end. Need to know base timing for the 350 vortec. Was told that vortec motors need to run with 4-5 degrees retarted timing. is this true?

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Old 02-19-2013, 11:06 AM   #2
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I think vortec run 0* TDC +/- 2*.

Below is the text from GM Service manual for 1997 Chevrolet C Pickup 5.0L, 5.7L, and 7.4L
Accordind to this you don't set the timing but the timing offset.
You need a "Scan Tool" that plugs into the truck and can read the data from the trucks computer.
Besides from that, it looks like a normal timing procedure.
You might be able to borrow a scan tool from a parts store, or at least use their tool and do it in their parking lot.

Setting Timing
Camshaft Retard Offset Test
The ignition timing cannot be adjusted. The distributor may need adjusting to prevent crossfire. To insure proper alignment of the distributor, perform the following:

With the ignition OFF, install a scan tool to the DLC.
Start the engine and bring to normal operating temperature.

Important
Cam Retard Offset reading will not be accurate below 1000 RPM


Increase engine speed to 1000 RPM.
Monitor the Cam Retard Offset.
If the Cam Retard indicates a value of 0 2, the distributor is properly adjusted.
If the Cam Retard does not indicate 0 2, the distributor must be adjusted.
Adjusting Camshaft Retard Offset




With the engine OFF, slightly loosen the distributor hold down bolt.
Important: Cam Retard Offset reading will not be accurate below 1000 RPM


Start the engine and raise engine speed to 1000 RPM.
Using a scan tool monitor Cam Retard Offset.
Rotate the distributor as follows:
To compensate for a negative reading, rotate the distributor in the counterclockwise direction.
To compensate for a positive reading, rotate the distributor in the clockwise direction.
Repeat step 4 until 0 2 is obtained.
Turn the ignition OFF.
Tighten the distributor hold-down bolt to 3Nm(25 lb. ft.).
Start the engine, raise engine speed to 1000 RPM and recheck Camshaft Retard Offset.


Read more: How do I set the timing on a 97 chevy 350 vortec? | Answerbag How do I set the timing on a 97 chevy 350 vortec? | Answerbag
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Old 02-19-2013, 11:27 AM   #3
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im guessing he doesnt have the pcm and has a aftermarket hei. the stock vortecs run 20 at idle and advance to about 35. none of which is settable in the traditional sense.

so that said i would just set it like a regular sbc. about 10 to 15 initial, or were it likes it. and depending on your dist setup you may have to adjust it to make sure it coming in at the right rpm.

sounds like a cool car, pics?
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