ok guys correct me if I'm wrong

02MustangGt88

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Jan 5, 2009
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i know ive already started a thread similar to this but i didnt get da answer i wanted.... so what id like to know... is if my 02 gt comes stock wth the p.i. heads? im under the impression that 99-04's have the p.i. heads... or atleast that the springs are rated to 550. max lift....
 
you should definitely still get valve springs IMO. could save you alot of trouble depending on what cams you run. alot more than the lift determines whether or not you need valve springs.

*edit*
 
perfect... so would i be ok running the 234int. 238exh. .550 int/exh. lift comp cams? or mayb even the 242/246 .550 lift...

No. Without valve reliefs on the pistons, you will likely run into PTV issues.

The 1st cam you mention is the XE270AH from Comp Cams. It will work with your stock motor, but it will require you to have the cams degree'd in to avoid piston to valve contact. The 2nd cam you mention is the XE278AH, and it will NOT work with stock pistons.

Either way, with either of these two choices, you will definately want aftermarket valvesprings.
 
well then i guess i wont push it too much an just go with the .550 lift 234 int. 238 exh. @ 0.50 duration and 113 lobe center angle 109 intake center line... i think it should be fine.... it says it recomends springs but it says dat on all of the .550 lift... the biggest it says springs required so ya...
 
well if i ran the .500 int./exh. 236/240 @.50 duration 114 lobe center angle and 110 intake center line... would i even notice a power gain? or would i lose power since id be losing some lift?
 
stop looking at specs alone, like lift or duration - they dont really mean anything alone. For one thing, a .500" lift is usually a NPI cam. You can run .550" lift no problem, it's the type of cam with that lift that can cause problems. If you dont want to use springs you're looking at a stage 1 cam, which would be VT stage 1 N/A's, comp cam xe262ah's or hitech stage 1's
 
and if i instal that comp cam you listed will i even notice a idle diffrence from stock?
I have a VT stage 1 cams and the car will die if it's cold and i put it into reverse without throttle. At a stop light you can feel the lope through the pedal in the form of surges of power. I have side-pipes and i can hear it against the cars at every stop-light. Anyone with 2 car-related brain cells can tell you have cams at idle - but it's not an aggressive wallop like stage II that echo off lopes like a tommy gun. Honestly you dont have much a choice, if you dont want spring you're getting a stage 1, and for a car that's just got bolt ons there's no reason for a stage II cam - you wont feel the power differnece 90% of the time.