Need4Speed1387

I want my car to be mid to low 13's when i get done with it and i am just wondering if you's think this might get me there. This is what i was thinking for my engine combo:
-350 bored .030 over
-Vortec heads with stock 1.94/1.5 valves
-~9.35:1 CR
-Performer RPM intake manifold
-Holley Street Avenger 670cfm carb
-2055 headers, 3-inch flowmaster, no cat
-3.42 posi
-stock converter (until i can afford one)

Which cam would ya'll recommend? I'm looking for good low-mid end torque and want it to actually pull all the way up to it's 5500 mark. These are the cams i was pondering:

HE268H
Specifications:
* Advertised duration: 268 intake/268 exhaust
* Duration at .050 in. cam lift: 218 intake/218 exhaust
* Gross valve lift: .454 in. intake/.454 in. exhaust
* Lobe separation: 110 degrees
* RPM range: 1,500 to 5,500
* Noticeable idle

XE268H
Specifications:
* Advertised duration: 268 intake/280 exhaust
* Duration at .050 in. cam lift: 224 intake/230 exhaust
* Gross valve lift: .477 in. intake/.480 in. exhaust
* Lobe separation: 110 degrees
* RPM range: 1,600 to 5,800
* Noticeable idle

XE262H 4x4
Specifications:
* Advertised duration: 262 intake/270 exhaust
* Duration at .050 in. cam lift: 218 intake/226 exhaust
* Gross valve lift: .462 in. intake/.480 in. exhaust
* Lobe separation: 111 degrees
* RPM range: 1,300-5,600
* Strong low-end and mid-range torque, good idle

So what should this setup get me to in 1/4mile times? How about horsepower? What should be changed? Thanks for any help!!!

Joshua

With Vortec heads, Performer intake, XE268 cam, Q-Jet 750 and I was able to get down to the 12.6s. Just recently put on a Performer RPM with a Holley 700 DP and can't wait to see what I run now.

Insomniac92z28

I would run the 2nd one (XE268H). It has more duration on the exhaust and you will need it with the vortechs. I think you will need a better spring on your heads to run it though, unless you have upgraded the springs already.

Need4Speed1387

Are the characteristics of the XE268 good for daily driving (in the summer)? With that lobe separation and duration i would imagine it to be a decently lopey cam. What are the benifits of a dual pattern cam vs. as single like the HE268? Is the XE268 still going to give me good low-end grunt? Sorry about all the questions, but this is my first engine build and i want some good results. thanks!!

Joshua

Idle is good and there's plenty of low end grunt.

SweetS10v8

A dual pattern cam is designed to help the exhaust side expell more gasses. Because most heads dont flow well on the exhaust side, they leave the vavle open longer so there is more time to release more gasses.

Need4Speed1387

Damn 12's would be nice. What's the rest of your setup? All this stuff will come slowly with the money, i'm just concerned about the engine first.

What valve springs would you suggest that would work good with the vortecs?

94-6spd

I have used both the HE268 and the XE268. My set up was vortec heads with the springs from comp that match the xe268 cam. 10.9 compression, performer rpm air gap, 750 vacuum secondary holley, 3000 stall and 3.73 gears. I ran a 7.78 in the 1/8 on 100 hp shot of juice. This was on slicks with a 1.64 60' time. 7.78 is about a 12.10 to 12.15 in the 1/4. I didn't make a run off the juice since I was at a grudge match night at the track. Definitely get the xe268. Oh, I used 1.6 roller rockers, too. It makes the lift .508 .510