[screwed]

Recently I had some bad work done on my 98 Gt. The timing gear was put on wrong and broke to pieces upon trying to start the engine. Took the thing apart after it would not turn over and found 3 broke valves on both heads. Is it better to rebuild the heads or just find some from another engine slap on and go.

 

[fast 50]

Update power

I would get some p1 heads from 99-2004 mustang with the top intake shouldn't run u much I wouldn't use the 98 their weak they don't flow enough a 5.0 push rod engine from the 80s make the same power then that 98 but if u do that swap with the newer heads and I take it will wake up up that weak 4.6

 

[SoCal2V]

Agree on PI swap. And since it will all be apart anyway you might as well add some nice stage 1 or 2 cams if budget allows.

How are the pistons doing? If they are banged up pretty good it may be best to just go for a complete engine swap. Also, considering what you may end up spending on a PI top end or rebuilding what you have, you could probably find a gently used 4.6 from a 2001+ CrownVic or TownCar for $1000 and just be done with it.

 

[fast 50]

Also the 97-98 have a different piston then the 99-04 so with the p1 swap u will have more compression then the 99-04 so that means more power not much tho but some I read that on a article years ago when I had my 04 I would upgrade the valve springs and like socal2v sead cams ur in their make it worth it

 

[screwed]

Sorry for asking but what are pi heads? i can get a whole engine from a 2004 crown vic is that better? and will it give me more horsepower than i have now? I want some more power cause after 3 she pretty much done. This car also has a 6spd tranny. was like that when i got it.

 

[SoCal2V]

Sorry for asking but what are pi heads? i can get a whole engine from a 2004 crown vic is that better? and will it give me more horsepower than i have now? I want some more power cause after 3 she pretty much done. This car also has a 6spd tranny. was like that when i got it.

PI heads and intake are what's on '99-'04 Mustang and '01+ CrownVic/GrandMarquis/TownCar.

Your car was rated at 215hp. PI engines from a Mustang are rated at 260hp, and due to differences in the exhaust on CrownVic etc I think those were 240hp.

The two engines are identical except for exhaust manifolds and upper plenum; for the engine swap you would retain your current plenum and exhaust manifolds, front accessories like p/s and alternator, fuel rails and ignition and flywheel if you have a manual transmission. This is a direct bolt up, minimal BS swap; for the headaches involved in swapping heads on a 4.6 that's still in the car most would agree that just swapping the engine is easier.

The engines from CrownVic etc are generally more desireable for this swap as they tend to have lived easier lives than something from a Mustang.

 

[Bigrob747]

Don't mean to thread jack but would adding those stage 1 or 2 cams require cam degreeing? Also I agree with the PI swap. makes a world of difference.

 

[SoCal2V]

Don't mean to thread jack but would adding those stage 1 or 2 cams require cam degreeing? Also I agree with the PI swap. makes a world of difference.

From what I've been able to figure out, stage 1 and most manufacturers' stage 2 cams do not require degreeing in order to avoid PTV clearance issues, but doing so will definitely get the best gains and driveability out of them. It's a worthwhile extra step.

For stage 3 cams, assuming you wouldn't need notched pistons anyway to avoid PTV contact, they would definitely need to be degree'd.

Lotsa good tech info on cams, heads etc can be found at www.modularheadshop.com If you are possibly in the market for cams, they make some of the most well regarded stuff in the Ford modular world.

 

[screwed]

Thanks man grabbing that engine asap.

 

[screwed]

Wasn't able to get the whole engine but got the heads. How can I get this Pony to turn into a horse with about 300 hp?

 

[SoCal2V]

At the tires? Stage 2 cams and all the other usual bolt on's (midpipe, tb/plenum and tune) will get you pretty close if not right on the button.

 

[screwed]

Thanks teacher. I will make u proud.plus1..gif

 

[stevew01]

I have a 300 RWHP dyno engine. 432 RWHP and 553 ft/lbs of torque with 150 shot of nitrous on my car. Here is my post for the dyno to show you but 300 RWHP is a serious mark and I didnt realize just how difficult it is to get there myself.

http://www.allfordmustangs.com/forums/4-6l-talk/831842-d-day-k-dyno-day.html

 

[stevew01]

http://youtu.be/R6up5ef8w8k

There is the youtube link for the dyno run.

 

[fordman777]

Depends on cam specs if you will have ptv clearance issues. The more overlap the cam has the more likely you are to run into ptv clearance issues. My cams require piston notches or valve reliefs. However I've heard comps stage 3's are fine as long as you degree them properly and add the correct valve springs. Also I'll add that most people do not know....no matter 2v PI npi, or even 4v. If you are going to have ptv clearance issues on one piston you will with all others. The intake valve hits on the outer edge of the piston. Also pi intake valves have less clearance than NPI intake valves. You can file them down for clearance tho.

For you to get to 300 fwhp a good workin on the heads, with a good set of cams, and full exhaust "long tubes". That should get you there easily. However 300 rwhp idk unless it's an over exaggerated dynojet.

 

[screwed]

So after reading the replies I ordered a new plenum with a bigger throttle body. I also went back and bought the intake from the 04 crown vic. I ordered stage 2 cams from amer. muscle but if i read right i need someone to check the valve clearance before i bolt them down? They are NOT just bolt and go.

 

[screwed]

Sorry but i also put a magna flow exhaust system on this thing from the cat. back. should i now go ahead and put new headers in also? Still has stock headers.

 

[fordman777]

You shouldn't have to worry about ptv clearance issues unless the heads have been shaved, block been decked, anything to put the valves closer to the pistons. You should be fine but make sure you get valve springs and degree the cams.

Headers is up to you. Long Tubes show the best gains. However they run a little more than shorties and LT's can be a job to install. So it's honestly up to you.

 

[Jackson3010]

A pi swap on your 4.6 will really help. Your c/r is a little higher then the99/04 so u will get a little more out of the pi heads