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Old 09-27-2003, 04:35 PM
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Cam changes in computer controlled vehicle?

I am getting ready to purchase some heads, intake, and hopefully a cam for my 93 Yukon.

Just wondering what problems I might have putting a new cam in? (concerning the computer)

I will have to have a new chip burnt. Thats not a big deal but should I go for the Crane Emissions legal cam's or will any cam work fine?

Id like to get some more top end outta this beast and Id like to have a little bit more duration. Personally Id like to have a fairly rough idle but I dont want to "disturb" anything else with a cam like this.

I have a Gear drive in an engine I built and I like it alot. Its not too loud, but not quiet either. Just enough sound for everyone to enjoy. hehe. I have heard some stories about gear drives now. They are bad for valvetrains because they dont "cushion" the vibrations and its bad for the cam/lifters/rockers...etc.

If anyone could give me a heads up on these two things, that would be great.

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Old 09-27-2003, 09:33 PM's Avatar
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When we build computer engines, we are usually concerned with staying within the limits of the stock chip. if you are going to have one burned, you should be able to go for a fairly lumpy cam, try to keep the duration below 224 @ .050 and keep the overlap low, maybe a 110-12 centerline, that should perk things up and fairly easy to burn a chip for. A gear drive is the worst piece of timing equipment you can put in a modified small block. Go with a true roller and you will have the best affordable combo there is.
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Old 09-28-2003, 12:23 AM
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Now i went with a geardrive,from (Summitracing) for my 350sbc. Just because when the shop guy,line bored the block for another crank,it put's the crank higher up into the block,closer toward's the camshaft,forwich you'll have slopp in a chain if you use one. So i did have the crank,and rod's, ballanced to help lessen the harmonic's that go into the cam. ( )
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