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Old April 3rd, 2011, 07:20 PM   #1
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Comp Cams Xtreme Energy XE270HR


Purchased the Comp Cams Xtreme Energy XE270HR Cam for my '94 GT. I have the GT40P heads and upper/lower intake also. When installing my cam will i also need to change valve springs? Or can i just use the stock setup?
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Old April 3rd, 2011, 07:46 PM   #2
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Intake Exhaust
Valve Lash: Hyd. Hyd.
Duration: 270 276
Duration @ .050" Lift: 218 224
Valve Lift: 0.544 0.544
Lobe Lift: 0.321 0.321

Valve Timing @ 0.05" Lift: Open Close
Intake: 27 BTDC 63 ABDC
Exhaust: 74 BBDC 22 ATDC

These are the specs for the cam. Also can i use the stock rockers? Ive read that stock are 1.6 and people have used 1.6 with this cam. jw how much more money im gonna have to spend on this
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Old April 4th, 2011, 01:36 AM   #3
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That cam was designed for 1.7 ratio rockers and you'll definitely need to upgrade the valve springs. This isn't the time to cheap out and reuse stock rockers/springs.
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Old April 4th, 2011, 11:16 AM   #4
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What valve springs should i get?
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Old April 4th, 2011, 11:21 AM   #5
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will these work?
COMP Cams: Dual Valve Springs: 1.430" O.D. Outer, .697" I.D. Inner
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Old April 6th, 2011, 08:19 AM   #6
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Yup, they'll work. Alternatively you could go for the beehive springs:

COMP Cams: Valve, Springs & Components
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Old August 28th, 2011, 09:44 AM   #7
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i plan on using the same cam. did your 1994-95 computer give you any problems? i plan in using a sct chip. TIA
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Old August 28th, 2011, 12:43 PM   #8
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Call Comp and ask them what springs to use. You absolutely HAVE to upgrade your springs.
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