Cam swap - Chevy Impala SS Forum
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post #1 of 9 (permalink) Old 03-12-2017, 05:41 PM Thread Starter
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Cam swap

Anyone running comp cams sko8500? Swapping it for a stock cam wanted to know if anyone has any feedback on this cam.

1994 Lt1 Caprice. 86000 miles. DD. Dynomax cat back, slp headers, k&n cold air intake, ck torque converter, 1.5 gm roller rockers, comp cams 500, eaton posi 342 gear impala wheels clear corners.
1994 Camaro Z28 hardtop, 165k, cat delete, 3 inch pipes, vette wheels, b & m shift kit and hard parts. 13.88 @ 100 mph. Sold
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post #2 of 9 (permalink) Old 03-13-2017, 10:32 PM
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Anyone running comp cams sko8500?........
Specs?

KW

1996 BBB SS, 398ci Solid Roller LT4


1995 DCM SS, LS3 w/Custom CAI, V-max 90mm TB, TSP CNC Ported Heads, Lingenfelter GT1-1 cam, Headman Mid-length Headers, 2 1/2" cat-back, 3200 Circle-D TC, 3.42 gears (for now) -- 450 HP/400 TQ To The Wheels


2014 Chevy SS; 429ci LS3 -- 508HP, 455TQ @ the wheels....After Break-in Dyno & Track Results Pending

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post #3 of 9 (permalink) Old 03-15-2017, 08:59 AM
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I've never heard of that part number.
We've had good luck with the comp 503 cam
if your looking for one off the shelf that'll work with stock rocker arms.
https://www.summitracing.com/parts/cca-07-503-8

If your willing to wait a couple weeks for a custom grind,
try Lloyd Elliotts similar cam: 226/232 w/ more lift than the comp 503.
www.elliottsportworks.com

Nab

10.87 @ 121 mph (MD Int' Raceway 11/14/2016)
Dry 150 shot through MAF (.062 jet)
Junk 355, Stock Iron heads; CC502 cam
4500 ati Turbo 400 4.56
9C1 'Anteloupe' 3300 lb
(World's lightest full-frame Bcar)
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post #4 of 9 (permalink) Old 03-17-2017, 06:14 AM
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Your opinion...

Nab- I am collecting parts for a mild Vortec head 383 TBI engine for the wagon. I have a stock LT4 cam already and I know it is pretty mild and would work well, but a friend has offered this cam to me:
http://www.federalmogulmp.com/en-US/...%20CS1152R.pdf
Do you think it would be a better choice than the LT4 cam?
I will be adding 3.42 or 3.73 gears and mild converter when the engine gets built.
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post #5 of 9 (permalink) Old 03-17-2017, 06:32 AM
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Hi Coot,

No that speed pro cam is too big for a TBI motor.
Use a stock LT1 cam not an LT4 hot cam.

Id strongly suggest getting the GM TBI vortec intake manifold if you haven't already.
The car won't run right without a true tbi intake manifold since the fuel is injected wet into
the intake. I could never get my tbi pickup truck to run right with vortec heads and a modified carb intake.

Also, I hope you have someone to tune it lined up b/c tuning for TBI is getting to be scarce these days.

Nab
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post #6 of 9 (permalink) Old 03-17-2017, 03:00 PM
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Hi Coot,

No that speed pro cam is too big for a TBI motor.

Use a stock LT1 cam not an LT4 hot cam.........
1. LT4 cam = poor choice for a 4200+ car. That cam has weak punch off the line, and really only shines in an RPM range that you'll rarely see with a 4-speed auto tranny....been there, done that.

2. Can't comment on the SpeedPro cam shaft as I don't have an adequate frame of reference with TBI engines to know how it would work. But in a LT1 engine......I'd pass on it.

3. The stock LT1 cam used to be (half jokingly) referred to as a 'truck' cam. It won't make power to 6000 RPMs, but it will pull stronger than most cams below 3000 RPMs.

KW
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1996 BBB SS, 398ci Solid Roller LT4


1995 DCM SS, LS3 w/Custom CAI, V-max 90mm TB, TSP CNC Ported Heads, Lingenfelter GT1-1 cam, Headman Mid-length Headers, 2 1/2" cat-back, 3200 Circle-D TC, 3.42 gears (for now) -- 450 HP/400 TQ To The Wheels


2014 Chevy SS; 429ci LS3 -- 508HP, 455TQ @ the wheels....After Break-in Dyno & Track Results Pending

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post #7 of 9 (permalink) Old 03-17-2017, 05:18 PM
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Thanks for the replies! The local Pull-A-Part has a few Vortec trucks/vans that have already been nearly torn down, so I'll grab a cam from one of them. What kind of valve springs should I run? I've got some 110 closed/310@.500 and 130 closed/340@.550.
With the stock cam, will I be okay leaving the press-in studs?
It's a budget build, so I am trying to use inventory that I already have from previous projects if possible.
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post #8 of 9 (permalink) Old 03-17-2017, 06:50 PM
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I know most here run LTs or LS motors but us TBI types need to help each other out too. I was rereading this article. I know it's been around for a bit but it should still be relevant. Recommended 350 TBI mods | Harris Performance, INC
I hope this helps you out.
Mark: Snowman-33

93 9C1: Work
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post #9 of 9 (permalink) Old 03-19-2017, 11:44 AM
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Quote:
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......What kind of valve springs should I run? I've got some 110 closed/310@.500 and 130 closed/340@.550.

With the stock cam, will I be okay leaving the press-in studs?
With a GM Truck/van cam:

1. As long as those springs are rated to at least .525" of lift, those spring rates should be good.

2. Yes....the pressed in studs will be fine.

KW

1996 BBB SS, 398ci Solid Roller LT4


1995 DCM SS, LS3 w/Custom CAI, V-max 90mm TB, TSP CNC Ported Heads, Lingenfelter GT1-1 cam, Headman Mid-length Headers, 2 1/2" cat-back, 3200 Circle-D TC, 3.42 gears (for now) -- 450 HP/400 TQ To The Wheels


2014 Chevy SS; 429ci LS3 -- 508HP, 455TQ @ the wheels....After Break-in Dyno & Track Results Pending

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