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Old 03-09-2008, 08:16 AM
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Cam/cam timing

I am converting a 1989 chev 350 from TBI to carburator, I will be using a Edelbrock 1406 Carb and performer intake manifold. my questions are can I use the factory roller cam? If I do use the factory cam will I have to change the cam timing? Can this be accomplished with a aftermarket gear/chain set?

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Old 03-09-2008, 08:27 AM
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You won't have to change the timing. You will likely be able to set the ignition timing a little higher than stock.
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Old 03-09-2008, 08:38 AM
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I have tried advancing the timing, Hard starting, No power off the line(V8 S-10)I currently have heads off to replace head gaskets and thought it would be a good time to swap the cam.
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Old 03-09-2008, 08:38 AM
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You will most likely need to change the distributor too. Since the timing is controlled electronically by the computer, loosing the TBI will also loose the throttle position sensor. The computer will not know where the throttle is at any given time and will not give you any advance on timing when accelerating. You will most likely have problems with the lockup converter too for the same reason mentioned above.

A fuel pressure regulator will need to be added too, way to much pressure for a carb.

Mark

Last edited by Jmark; 03-09-2008 at 08:44 AM.
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Old 03-09-2008, 09:02 AM
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I am using the stock HEI distributor, Timing does advance when we open the throttle while viewing with a timing light. The transmission has been reworked by reputable tran shop. I still question cam timing?

I also have installed a fuel pressure regulator with a by pass which maintains a constant 5.5 psi at carb.
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Old 03-09-2008, 09:45 AM
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Sounds like you have all the bases covered. The "cam timing" will NOT need to be changed. You can install a new cam/lifters now if you like, but it's gonna be expensive to get a roller setup.
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Old 03-09-2008, 10:38 AM
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I currently have the factory roller cam but I do not know the cam specs, How would I find them?What would be a good upgrade to accomplish more bottom end toque with slight lope at idle?
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