73-87chevytrucks.com
73-87 Chevy _ GMC Trucks => Performance => Topic started by: 73c10Shorty on October 12, 2010, 10:57:02 pm
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So I'm getting my stock 350 rebuilt and when I met with the machine shop I asked for some mild performance upgrades. The mechanic suggested I go with an "RV" cam and said it would give me good low end torque and still be streatable. I agreed and we wrote up the rebuild to include this cam. Later at home I looked at the receipt and thought I would research which cam they were installing. After looking up the comp cams 12-211-2 on Summit I'm starting to think this is not a mild cam.
Specs:
Cam Style Hydraulic flat tappet
Basic Operating RPM Range 1,800-5,800
Intake Duration at 050 inch Lift 224
Exhaust Duration at 050 inch Lift 224
Duration at 050 inch Lift 224 int./224 exh.
Advertised Intake Duration 270
Advertised Exhaust Duration 270
Advertised Duration 270 int./270 exh.
Intake Valve Lift with Factory Rocker Arm Ratio 0.470 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio 0.470 in.
Valve Lift with Factory Rocker Arm Ratio 0.470 int./0.470 exh.
Lobe Separation (degrees) 110
Computer-Controlled Compatible No
Grind Number CS 270H-10
Valve Springs Required Yes
Description:
Designed for hot street/strip cars, these COMP Cams Magnum series cams require a higher compression ratio, rear-end gear ratio, and stall torque converter than stock. With a very aggressive profile, these camshafts provide maximum top-end performance for your high performance car.
Does anyone know much about this cam or have any thoughts or suggestions?
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The lift and dur are a little higher than what I run and I wouldn't call mine a rv cam but that 110lsa helps bring the power on in a lowe rpm. I run a 214/224 442/465 on a 112lsa in my 357 in my k10 but I run a 2800 stall also. It pulls fine and has plenty of low end I've also only got 3.42 gears with the th350 trans.
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What is it that you are going for? What other things are they doing to the engine?
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you would probably be better off with a 268 or 12-210-2. great low end cam
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I'm not really sure of the details but they're machining the block and cleaning up the heads, replacing springs, valves, putting in flat top pistons, etc. They're doing a complete long block rebuild. I'm really hoping for at least a noticable increase in hp/torque, but nothing crazy.
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Know what heads you have?
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I believe the heads are whatever came originally with the truck. I was told the motor is all original. I'll call the machine shop in the morning and ask if they know which heads are on there.
I looked up the comp cams 12-210-2 and the description definitely sounds more like what I'm after.
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To really help you out with selecting a cam we need to know at the very least:
Compression ratio, heads, intake manifold, exhaust, transmission, gear ratio, tire size and intended useage otherwise it's a total guess on any suggestion you get.
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I agree with the above post without all that information its all just a guess! Your heads and compression ratio will take a toll on how it will run.
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Hey guys, thanks for the help. I don't know some of the information that you asked for so I ended up calling the machine shop and having them go with the 268 instead of the 270. It seems like a safer bet.
What I do know:
Stock heads, stock intake manifold, 2 1/4" exhaust tubing with 22" glasspacks, recently rebuilt turbo 350 tranny, 20' wheels. My truck is a cruiser. I'm not looking to burn our or anything like that. I just would like to feel a little pep.
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yeah make sure to stress on that and tell THEM its a street truck and that you don't want to have to run a higher stall if you don't have to. Unlsee you alread have one that is.
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should not need a stall converter. 268 works well without one. anything bigger and i would say definately get a stall. friends of mine have been very happy with this cam. ;D
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I would add some headers to this equation, If you haven't already.
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Yes, a set of headers is definitely on my wish list. Along with a better intake and carb... but you know how it is... all in time.
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Look around I ended up getting my long tubes from a friend for and old junk qjet carb I had! (No saying qjets are junk it just needed a lot more work than I knew how to do! LoL)
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That good old 214/224 cam works pretty good in a truck.
Good choice by going to the Comp 268 instead of the 270.
The most popular one that we use is the Comp Extreme Energy 262H.