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Old 07-20-2010, 09:34 PM
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cam question

hi im new to this and i need help i have a 91 chevy k1500 4x4 and im putting a 99 vortec 350 motor in it and its a 5 speed manual i have a weiand stealth intake edelbrock carb and headers i need to know a good cam to put in it i just want something that has a choppy idle to it and gives it some performance but i dont want to put new pushrods and stuff in it cause the motor only has 20000 miles but i need some help thanks

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Old 07-21-2010, 09:00 AM
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A "choppy idle" will not have good performance in this case.

stock vortec engine, stock gears, stock converter, in a heavy truck requires an almost stock cam with a smooth idle. if the cam is too big then it will be a major dog.

A 99 vortec engine should have the right cam already in it for your application. You could possibly go up one cam size but not worth it in my opinion. Call compcam and see what they say. You have a roller cam in there.

I would keep the stock cam and go up to 1.6 rockers and call it good.
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Old 07-21-2010, 10:45 AM
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Quote:
Originally Posted by 454C10
A "choppy idle" will not have good performance in this case.

stock vortec engine, stock gears, stock converter, in a heavy truck requires an almost stock cam with a smooth idle. if the cam is too big then it will be a major dog.

A 99 vortec engine should have the right cam already in it for your application. You could possibly go up one cam size but not worth it in my opinion. Call compcam and see what they say. You have a roller cam in there.

I would keep the stock cam and go up to 1.6 rockers and call it good.
Agreed , It will run best stock . In my opinion any cam change will sacrifice off idle performance . JMO
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Old 07-21-2010, 02:30 PM
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Call or E-mail comp cams and ask about a "thumper" cam for your application.

They "supposedly" give the rumpity-rump that so many of us gearheads love to hear without the ill effects.. Just how they do it or whether it is true I cannot say.

You would need to make sure that your heads can handle whatever lift said cam provides, I think Vortecs typicaly top out @ about .450 lift without machine work mods..
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Old 07-21-2010, 03:09 PM
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Here you go buddy. Check out this Howards Cam # 180305-08. Howards recommends a 2,500+ stall but since you have a manual you can just pop the clutch around 3,000 rpm for good take off. This cam will have a choppy idle and has good low and mid range performance.

http://www.summitracing.com/parts/HRS-180305-08/


Over lap is what gives a cam it's lopey idle. This cam with it's duration 230 @.050 and it's tight LSA of 108 will do the trick.

Only problem is it's close to vortec heads max lift, over really. Unless you have already upgrade the springs for a higher lift cam, you'll need different springs and retainers. You can use your stock lifters and pushrods although you should check the valve train geometry.

The lope will be more noticeable with the idle speed set low. Say around 650 rpm.
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