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*Ticker* · 02-28-2010, 04:33 PM

Stock GMPP Vortec heads are lift-limited to .475 so it won't work with stock Vortecs.There are spring upgrades that can be done to increase lift, but the heads top out flow around .475 so anything beyond that doesn't really add power.

There's no comparison to a roller cam - a roller will make more HP/TQ throughout the RPM range and significantly more in the midrange. Retrofit roller kits are expen$ive, adding about a $600 premium to the price of the cam. Generally I'd say that given the capabilities of the Vortec, I would not personally spend the money for a retrofit roller cam as you can't really take full advantage of the cam ramp.

Depending the RPM range you want to make power, any of the CompCams Xtreme 4x4 cams with < .475 lift (such as grind # 12-235-2) will serve you well.

02-28-2010, 04:33 PM	#4
Ticker Account Suspended Join Date: Oct 2009 Location: Sammamish, WA Posts: 2,404	Re: Opinions on GM cam Stock GMPP Vortec heads are lift-limited to .475 so it won't work with stock Vortecs.There are spring upgrades that can be done to increase lift, but the heads top out flow around .475 so anything beyond that doesn't really add power. There's no comparison to a roller cam - a roller will make more HP/TQ throughout the RPM range and significantly more in the midrange. Retrofit roller kits are expen$ive, adding about a $600 premium to the price of the cam. Generally I'd say that given the capabilities of the Vortec, I would not personally spend the money for a retrofit roller cam as you can't really take full advantage of the cam ramp. Depending the RPM range you want to make power, any of the CompCams Xtreme 4x4 cams with < .475 lift (such as grind # 12-235-2) will serve you well. Last edited by Ticker; 02-28-2010 at 04:34 PM.