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Re: Opinions on GM cam
Quote:
Originally Posted by Ticker
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.
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This is in a roller block. Also, I'm planning on doing the beehive spring upgrade.
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1968 C-10 SWB, 5.7 Vortec/700R4/3.73 posi, Torch Red
1968 Camaro, 250/Powerglide, all original (No, I'm not gonna drop a 350 in it!...Jeez!)
2000 Honda VFR in the faster yellow!
2008 Husqvarna TE-610
1967 C-10 SWB 'Six Appeal'-Gone but not forgotten...
Last edited by Brad; 02-28-2010 at 04:49 PM.
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