olaosunt
Well-Known Member
Thanks man .Go with the PAC 1234x valve springs and don’t look back. They are as big as you can go and maintain the vct’s.
I am putting together a sleeved 5.0/ GT heads to replace the 5.2 that broke in my Hellion car ... so I can sell the damn car !
I had the MMR upgraded springs for the GT 350 heads in that motor but it looked like I was seeing valve float at 17 psi . Not sure if it’s got anything to do with it but seemed to be more pronounced after I swapped the GT 350 intake .
The 5.2 motor was making almost 1100 whp at only 17 psi but I think it will need much more to make similar with the 5.0
IIRC it took 21 psi when I had an alluminator/GT heads before to make 1000 whp
How about the trick flow springs ?
They are a little cheaper but what’s another $170 for the PAC springs when I consider the $$$$ I have already put in to this damn car .
http://www.jpcracing.com/trickflow-drop-in-coyote-valve-springs-kit/
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