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Old 08-24-2010, 02:06 PM
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cam for a stock 350

I have stock 350 that was Tbi but now has a Eldbrock 600 carb with 9.1 and vortec heads , I'm try to go with the biggest cam ? Any help

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Old 08-24-2010, 02:39 PM
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have the vortec's be machined to take higher lift? Is it a roller block. What is it going it? and Are you willing to go with a stall if you have an auto trans.
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Old 08-24-2010, 03:03 PM
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Quote:
Originally Posted by old 94 gmc
I have stock 350 that was Tbi but now has a Eldbrock 600 carb with 9.1 and vortec heads , I'm try to go with the biggest cam ? Any help
To give you an answer, could you tell us what the use for the truck will be, the rear gear ratio (if known, if not we can tell you how to easily find it), do you have smog police to satisfy, what other mods (if any) have been done besides the Vortec heads (and are they modified for higher than stock lift and better springs), and as much background and other info as you can provide.

But generally speaking, the "bottom of the page" BIG cams aren't suited to stock or near stock engines/vehicles. The performance can end up far worse than stock unless everything is chosen as an integrated combination of parts that all work together.

That said, there's no reason to think that you can't add a decent amount of power at an RPM range where you can use it to make your truck a lot more fun to drive.
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Old 08-24-2010, 03:06 PM
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What are you shooting for here, Performance or just sound ?


Cole
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Old 08-24-2010, 03:39 PM
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I'm looking for a good sound and decent power. I don't real know a lot about this stuff. I just got the bug at a old age and I'm trying to learn. . thanks
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Old 08-25-2010, 08:00 AM
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In this case Bigger is NOT better !!!
Put in a camshaft similar to Edelbrock Performer and you will be happy with the result, It will have a mild tone in it, Grate torque and if the car is set up right you will get good MPG.
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Old 08-25-2010, 09:31 AM
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268H if its a flat tappet cam...I'd use an RPM airgap, that cam if and ONLY if your vortec's have been modified for higher lift.
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Old 08-25-2010, 10:45 AM
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Thanks for the help guys
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Old 08-25-2010, 03:43 PM
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You will also need a non-feedback, stand alone HEI distributor from an '80 back car or ~'86-back truck that has the 4-pin module and vacuum advance.

1-5/8" long tube headers and a low restriction dual exhaust, too.
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Old 08-25-2010, 03:50 PM
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I would use a 260H compcam with a stock converter with stock gears in a heavy truck.
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Old 08-25-2010, 04:06 PM
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If this is a truck that you will be driving a lot then I would suggest a cam no bigger then 220@ 50 duration or your street manners will start to go down hill in my opinion.

This weekend I am going to put a slightly smaller cam in my 350 small block to get what I really need for a daily driver type deal. It is a custom grind similar to a lunati voodoo roller cam 260/270 212/218 @ 50 510/510 lift with a 112 LSA.

This will give me a good idle,vacuum, torque in the bottom to midrange and still some decent pull on top to about 5000 rpm. My cam will also have excellent street manners so I won't have to try to stay out of traffic so much.

Trust me I have been through 8 different cams in 5 different builds between my two s10's and I had to learn the hard and expensive way. I know that rough idle sounds nice but it comes at a great price which is too much to list here. Please be honest with what your going to do with your engine.

I had to do that twice now and also peoples opinion on what is good street manners will vary as I have learned. If I was in your shoes I would go with a 210 to 215 range @ 50 duration to keep your ride in spec with your other stuff. Rear end gear ratio and everything else has to match up as well. Good luck on your build. The 260H cam would be really nice.
Eric
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Old 08-25-2010, 04:13 PM
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The truck is a reg cab 1500 , it was a 4.3l but I want more so I bought a 5.7l from a guy he had put in a above stock cam in it. I was told that the cam wouldn't work with the carb becauseit was a tbi , the truck is working but I want a little more power. What I ment when I said Big cam was the biggest I could use for my stock engine.. The guy gave me the headers and 3inch exhaust so I went with a y-pip
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Old 08-25-2010, 06:16 PM
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Well your vortec heads are really great heads but they are limited to lift and other factors. The stock springs on them are not able to handle high lift and faster opening ramp rates for camshaft wise. I had a stock vortec in my chevy s10 when I got it and it had an edelbrock dual plane intake and a edelbrock 600 carb.

I had a 700r4 for a trany and for a stock motor it ran nice and good but the cam was pretty mild cause it was a factory one. With something bigger it would have really been different. Only reason I did not keep it was I wanted more options for rebuild.

Look into the comp cam high energy flat tappet cam line. They can be used with most stock setups.

The 260h high energy cam would work well with your vortec heads and should not need to have anything changed. It's a little more then a rv type cam.

It specs at 260/260 212/212 @ 50 with 440 lift with 1.5 ratio rockers. You would have a nice low to midrange torque band and still pull strong to about 5000 rpm give or take a little. That is what I would go with and that cam will give excellent street manners and with a good exhaust system will sound good cruising. Check it out over at jegs.
http://www.jegs.com/i/Comp-Cams/249/...oductId=746636

Get something like that and you will be happy.
Eric
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