ok guys correct me if I'm wrong

02MustangGt88 · Jan 8, 2009

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....

DBMSTNG · Jan 8, 2009

yes, 99-04's have PI heads.

02MustangGt88 · Jan 8, 2009

thanks man... thats all i needed to know... would you happen to know what the stock lift is on my 02?

tag4car · Jan 8, 2009

lift intake .504 lift exhaust .531 duration @ 0.50 200in/209exh Duration 242in/252exh

02MustangGt88 · Jan 8, 2009

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

fasthippo · Jan 8, 2009

you should definitely still get valve springs IMO. could save you alot of trouble depending on what cams you run.

fasthippo · Jan 8, 2009

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*

Tim2002GT · Jan 8, 2009

02MustangGt88 said:
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.

02MustangGt88 · Jan 8, 2009

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...

Tim2002GT · Jan 8, 2009

I would still recommend you get the valvesprings. It would be much safer in the long run to get them.

You can get the new TrickFlow valvesprings for like $150 from Summit Racing - High Performance Car and Truck Parts | 800-230-3030.

Edit: Sorry, they are actually $199.

02MustangGt88 · Jan 8, 2009

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?

Tim2002GT · Jan 8, 2009

If I were you, I would get the XE262AH cams. They will make good power on fairly stock applications.

Read through this article. They test the XE278AH vs. the XE262AH vs the stock cams.
Comp Cams Ford Mustang Two-Valve Install - Muscle Mustangs & Fast Fords Magazine

02MustangGt88 · Jan 8, 2009

but im really not looking at changing springs... if i can still gain some power with the .500 lift cams then ima take that route

02MustangGt88 · Jan 8, 2009

so does anybody know if ima get any power outa the .500 lift? the noticeable idle or rough... the specs i posted were for the rough idle.

CobraRed_96_GT · Jan 9, 2009

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

02MustangGt88 · Jan 9, 2009

and if i instal that comp cam you listed will i even notice a idle diffrence from stock?

Tim2002GT · Jan 9, 2009

Here is a vid of a car with the XE262AH cams...
YouTube - 97 Mustang GT w/00 Motor & Comp Cams

Here is a vid of Hotmustang331's old GT with the VT stage 1's...
YouTube - VT(CMS) stage 1 n/a mustang cams Idle

CobraRed_96_GT · Jan 9, 2009

02MustangGt88 said:
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.

Stark77 · Jan 9, 2009

Hitec Stage 2's - no springs required - no PTV issues on a stock block - and it can get you to 300rwhp.

02MustangGt88 · Jan 9, 2009

well where would i find the hi tec cams? a buddy of mines got the stage 1 vt's n it sounds alright

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