Cam selection... 383 chevy, vortechs, heavy car...streetable but fun. 400hp-ish - Page 2 - Hot Rod Forum : Hotrodders Bulletin Board
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Old 12-09-2012, 05:48 PM
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Motochris,
You never said if the vortecs were modified from stock to allow more than 0.450" valve lift.
If they have you may want to consider the Comp Cams 270HR. Using their Camquest software configured for your combination it indicated 404 HP and 463ftlbs of torque, 218*@0.050" lift single pattern cam, 0.500" valve lift with 1.5:1 rockers. Should work good with your torque convertor.JMO
You may want to upgrade your valve springs for insurance.JMO
ssmonty

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Old 12-09-2012, 06:00 PM
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Motochris,
You never said if your vortecs were modified for more than 0.450" valve lift.
If they have you may want to consider a Comp Cams 270HR roller cam with 218* duration @0.050" lift single pattern, w/.500" valve lift w/1.5:1 ratio rockers. Using Comp's Camquest software with your engine specs it indicates 404HP, and 463ftlbs of torque. You can get a few more rpm with the XR270HR to get 411HP and the same 463ftlbs with a slight loss of torque off idle.
Both should work good with your torque converter IMO. You may want to upgrade your valve springs.
FWIW,
ssmonty
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Old 12-13-2012, 03:30 PM
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Quote:
Originally Posted by ssmonty View Post
Motochris,
You never said if your vortecs were modified for more than 0.450" valve lift.
If they have you may want to consider a Comp Cams 270HR roller cam with 218* duration @0.050" lift single pattern, w/.500" valve lift w/1.5:1 ratio rockers. Using Comp's Camquest software with your engine specs it indicates 404HP, and 463ftlbs of torque. You can get a few more rpm with the XR270HR to get 411HP and the same 463ftlbs with a slight loss of torque off idle.
Both should work good with your torque converter IMO. You may want to upgrade your valve springs.
FWIW,
ssmonty
Thanks. I was looking at that exact cam (270HR) too. My heads are NOT currently setup for the higher lift, but I'm leaning that way. May as well do it while it's apart.
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