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Old 02-02-2009, 11:02 PM
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vortec cam selection, custom grind?

ok, i was reading through this build that i've read a thousand times cause it's exactly where i want to go with my build (http://www.popularhotrodding.com/eng...manifold.html). they use a cam described as follows on the 2nd and 5th page, "Hydraulic roller cam COMP 12-000-8 custom 108 LCA, 4 deg. adv. $272.75". If i order that part number from summit will i get the same cam or do i actually have to specify what i want? Also would this still be the best cam for my build?

my setup:
-'98 vortec 2 bolt, just a clean up mill
-906's w/CCA-26918-16 springs, just a clean up mill
-summit hyp +6cc pistions (9.6/1 with 64cc's)
-pushrods/SUM-G6406, roller lifters/SUM-HT214 (mine were shot)
-factory crank and rods.
-factory press in rocker arm studs 1.5rr
-4150 650dp mech.
-proffesional products crosswinds intake.
-3.90 rear end
-iroc t5
-2300lbs '84 rx-7

thank you for your time and patience

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Old 02-02-2009, 11:52 PM
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That just the comp PN for the blank cam core.
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Old 02-03-2009, 02:43 AM
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F-birds right. You would have to give the Lobe #'s for Intake & Exhaust so they can grind the custom cam profile on the cam blank.
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Old 02-03-2009, 03:45 AM
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The link didn't take me anywhere. Are you talking about the "Sledgehammer" build? The best way is to order that through comp directly.
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Old 02-03-2009, 05:57 AM
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the sledge hammer build is correct. would you change any thing about the specs from there cam to mine?
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Old 02-03-2009, 02:37 PM
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I would add more compression (10 to 10.5:1) and a cam with 240 degrees on the intake and 246 on the exhaust. Need more exhaust than intake with stock vortec heads

I have about the same car (240Z with a V8). 3.90 gear with a T5. I run a compcam 292H. runs mid 11's a 120 mph. idles rough but drives nice right off idle and makes power to 7000 rpms.

I have used smaller cams but didn't like the effect. lots of wheels spin then no power band left to use after the wheels got traction. I used cams between 270 and 292 degrees and the bigger cam was the best for a street/strip cam. The 292H had plenty of torque with the performer RPM intake and once the tires stopped spinning the engine still had another 1500 rpms to work with.
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Old 02-03-2009, 02:49 PM
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The cam in the build up used the EQ vortec replacement heads. They also used 1.6 rockers. They listed the lift as .565 and listed the duration as 224/224 @ .050. If that is correct they used XFI exhaust roller hydraulic lobes. The lobe number is 3035.
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Old 02-03-2009, 10:10 PM
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i seached for that cam (292H) on summit and all i could find was flat tappets, is there a roller version of this cam or something close in a hyd roller? i just don't know that much about cams yet. A decent price would be wonderfull as well , i was hopping to stay (well) under 300$ for the cam alone.
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Old 02-03-2009, 10:41 PM
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how about any of these?
-GM Performance 12565308
-COMP Cams 07-306-8
-Edelbrock 2201
-EDL-2204 / i think i like this one, but, i still dont understand completely.

could someone explain the what lobe seperation would be best for my build??

should i jump up compression from 9.6-1 with factory heads?

Last edited by slate84; 02-03-2009 at 10:55 PM.
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Old 02-04-2009, 07:28 AM
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Generally a different LSA on the same lobe profiles will produce these results:

Narrower: rougher idle, stronger mid-range, lower vacuum signal, worse milage

Wider: smoother idel, broader torque curve (though lower), stronger vacuum signal, better milage

larger bore/stroke ratios usually run better with a slightly wider LSA. Better flowing heads usually like a wider LSA. From what I have seen Vortec's like between a 105-108 LSA in most cases, but that may not be suitable on the street, nor with the wide split that a lot of dual pattern camshafts now have. For that reason I'll usually take an Isky over a Crane or a Comp cam- their shelf cams are closer to a single pattern (many of them are single patterns) and they run narrower LSA's.

Overlap is closely related to LSA and is a result of cam durations and LSA. for street purposes I'd try to keep the overlap below 75. Even that is a LOT for a daily driven engine. In most cases people are happiest with overlap values between 55-65 on the street.
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Old 02-04-2009, 07:33 PM
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That is a custom ground Competition Cam. You really need to order that through them. And make sure you get the cam that is setup for the factory roller block. They're set up for a retainer plate.

What are you doing as far as headers and an exhaust system ? That will help determine your lsa.
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Old 02-04-2009, 09:08 PM
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i'll be running 1 5/8 what i call, half long tubes. then purple hornies. i understand what each measurment is, but i just don't have enough knowledge to figure out how one effects another.

is the EDL-2204 cam a good one? it looks like its well balanced. i would care if the power didn't come on till a little later to since its a t5 with a 3.90 rear end in a 2300lbs car. traction through the 13" rims is going to be a ******.
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Old 02-04-2009, 09:58 PM
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What about COMP Cams 12-450-8
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Old 02-04-2009, 10:02 PM
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i like the numbers on it but the .560 seems to be over the safe limit given of .550 by the comp springs.
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