Famine67

iTrader: (3)

There seems to be inconsistent info on whether or not the VVT Phaser (specifically the ones in L99, L92, and L9H engines) can handle Dual Springs.

Texas-Speed offers their VVT cams with Dual springs, but Mast Motorsports only uses Single beehive springs.

According to what I've been able to pick up. Some people are saying that the oil pressure in the phaser is insufficient to move the cam against the spring friction

Which is the truth? Can those of us with VVT run dual springs or will our VVT be crippled?

11z71

iTrader: (10)

I had a 2011 6.2 silverado that had a pat g spec'd vvt cam in it. I had installed a set of PAC beehive springs(1218's IIRC) on pats recommendation because he had said that the pressure from dual springs may limit the phasers ability to adjust the camshaft accordingly.

Jime

Considering TSP is getting around 100 hp from their vvt-3 cam it doesn't sound too crippling. I just installed their vvt-4 but its not up and running yet.

http://www.performancetrucks.net/for...-3-cam-475010/

1989GTA

I am considering the VVT4 camshaft for one of my projects. Do you have the cams specs. You can send a private message if you want.

Jime

The only info I have is from their website which says it is approx .635 lift and over 230 intake duration that they specify for the vvt-3.

cam

iTrader: (9)

meh, too much spring is a LOT better than not enough. I run PAC1518 on a VVT engine, 4 years now, all good.