[Gmecm] re: L31 Info Part (2)
mrcad472 at iowatelecom.net
Wed Mar 16 09:24:24 CST 2005
----- Original Message -----
From: "SubZero350 at att.net" <subzero350 at att.net>
> A friend of mine did a GM LT4 HOTCAM kit on his 96 GMC 1500 Vortec 5.7L.
> I got his tuning done but the engine makes very little power below about
> 2800rpm. Whats worse is the power band falls off sharply after 5400rpm!
> Fuel looks ok and I gave it as much timing as it can handle. I am
> convinced the stock vortec intakes are horrible from a performance
> standpoint. Now I know some may not be familiar with, or not like the
> profile of the LT4 HOTCAM, but let me give you a couple of examples of
> what I have used it in and the results...
To be honest, I would expect nothing else. It's a truck motor. Trucks need
low end torque, not high reving hp. His combo would be like putting a
4500-9000RPM cam with a stock cast iron Q-jet intake in an old truck. It's
just not matched.
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