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Old 11-28-2007, 07:35 PM   #1
tcs81281
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comp xr270hr roller cam

is there anyone running this cam(xr270hr from comp) if so how do you like it? i will be running this cam in my 383,9.2compression,87-94centerbolt heads(2.02/1.6valves,pocket ported,76cc.flat top pistons, comp roller rockers,longtube headers,edelbrock airgap intake, edelbrock600cfm carb. should be 400-420hp and about the same in torque from what i have researched. i will be running a th400 or 700r4 later on. should i run a stall converter?
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Old 12-02-2007, 01:40 PM   #2
1968SWBBigBlock
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Re: comp xr270hr roller cam

Looks like an ok combination
I would be leary of the 600cfm, I think it is to small, at least 650 cfm
the only thing I worry about is your 2.02 valves will not help you until you get over 4200 rpm so your best power band is not utilized real well.
Maybe look at a higher lift cam, and a 650 cfm carb
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Old 12-04-2007, 10:39 AM   #3
tcs81281
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Re: comp xr270hr roller cam

bigblock, thanks for the comments. i have already bought the cam so ill just stick with it, dont want to get to radical, truck will be a daily driver. comp shows this to be the biggest cam for a stock converter, should i put a little little bit of a converter in tranny? motor should be around 400hp, id be very happy with atleast 375. compared to what i have now(goodwrench 350,around 270hp) i do have a 700cfm edelbrock with maunual choke, guess ill have to play with both and see what works best.
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Old 12-04-2007, 05:19 PM   #4
1968SWBBigBlock
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Re: comp xr270hr roller cam

If you want to use a different converter I would not use a large one.
You should be fine with the stock converter for a daily driver.
I think the 700 will win this fight
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1968 SWB
454 + .040, 490HP x 540 FT pounds of Torque 10-1 Kb Forged pistons, recon rods w/ ARP wave loc bolts
781 heads Ported with 2.19/1.88 SSTvalves
Lunati 60204 cam, Micro Trol lifters,
Ported Edelbrock Performer Rpm manifold armor coated, Pertronix Triple Strike Ignition
Holley 770 Street Avenger carb,Headers armor coated
Built by Watson Ruppel Performance in Sarahsville Ohio.
Hardshift Tranny Built Turbo 350,TSI 10" 3000 stall
12 Bolt Eaton Posi 4.10 Richmond Gears moser axles
18.5" x 31" Hoosier Pro Street Radials
ET Classic 5 Wheels - polished
Power Steering, Power Brakes,Disc Brakes,Tach & Gauge Dash, Tilt,Factory Air (gone)
Custom Paint & Body Work

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Old 12-04-2007, 06:28 PM   #5
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Re: comp xr270hr roller cam

2.02s won't hurt the low end, its a 383 breathing threw 170cc intake ports You didn't post any specs but comps flat tappets equal out to 220* @.050 when they are advertised at 270* so thats what I'll assume. Thats a great mid range spec for a 383. I agree you need a 750cfm, eddy dosen't make a 700cfm that I know of? The 750 will not hurt your throttle response. If you go with a convertor [I wouldn't for a daily driver] 2200 is the biggest I'd get.
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Old 12-04-2007, 06:31 PM   #6
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Re: comp xr270hr roller cam

Get a stock C4 corvette converter. It'll stall a few hundred RPM's higher without a noticable change in street manners. I actually have one layin around in the garage that you can have for free - shoot me a PM if you're interested
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Old 12-04-2007, 06:46 PM   #7
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Re: comp xr270hr roller cam

cam specs: 218/224@.050, 495/502 lift with 1.5 rockers. ill probrally just leave the converter i got in tranny for now when i swap tranny from nova to truck when its done(700r4)
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Old 12-05-2007, 03:04 PM   #8
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Re: comp xr270hr roller cam

Check the compression recommendation on that cam.

Edit; actually comp posted a dyno sheet @ 9.25:1, so I think that means it'd be fine.

http://www.compcams.com/Technical/Dy...0HR-10_001.asp

Last edited by Jim_PA; 12-05-2007 at 03:36 PM.
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Old 12-06-2007, 10:44 PM   #9
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Re: comp xr270hr roller cam

are your centerbolt heads the ones that came on the TBi motors? If so they aren`t the best flowing heads. That cam would be a nice torque cam, I would run it for sure. I would rethink the heads though.
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Old 12-06-2007, 11:07 PM   #10
tcs81281
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Re: comp xr270hr roller cam

i will run that cam its already bought, and yes the heads are the tbi center bolts with a nice port job with 2.02/1.6valves, its going to be a daily street motor.
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Old 12-06-2007, 11:11 PM   #11
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Re: comp xr270hr roller cam

Quote:
Originally Posted by tcs81281 View Post
i will run that cam its already bought, and yes the heads are the tbi center bolts with a nice port job with 2.02/1.6valves, its going to be a daily street motor.

I don`t see a problem with the cam, it`s the heads I see as a problem. They have a necked down intake port about 2" down or so and don`t flow for nothing. They should be 64cc`s as well. Whats the head casting number? You`ll make some good torque but you would see 400-425hp owith those heads. Bigger vlves and port work isn`t going to chage the design of the heads and won`t help much. don`t get me wrong, I`m not trying to knock your combo. aside from the head choice I think it will be a great street motor for a heavy truck.
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