flatheadz-forever

hi there guys I have a 1998 f150 regular cab 4x4 4.6 flareside 3.55 gears limited slip. I would like to upgrade cams which cam would give me good hp and torque gains down low and a lumpy idle would be cool also would a pi head swap be worth while and i do have the romeo motor also i have 95,000 miles any help would be appreciated so far I have looked at the stage 1 and 2 trick flow track heat cams and the hitech racing stage 2 n/a cam please help

flatheadz-forever

any help

ColtRice17

Go with a twick flow brand cam. And you will need alot more work then just cams like a new pcm/ecu etc. But that's what i have and I've gotten alot more low end tq from them.

ColtRice17

If you have the money go with their twisfed wedge 185 heads and a good .500x.500 cam set. And you will be verh hap but you willned a new intake too

flatheadz-forever

coltrice: how exactly did you get your increased torque?

and I dont exactly have the money for the tfs heads but i might be able to do some ported pi heads swapped on

Carcrazygts2

Do ported pi heads and find someone who does custom cams. You will be happier. I myself have been running ported PI heads for over 3 yrs now.

flatheadz-forever

Is it a big seat of the pants difference with the ported pi heads also who ported your heads and who ground your cams for you thanks for the reply

Carcrazygts2

With my last engine I had a NPI short block with Fox Lake ported PI heads with custom cams from SHM(Sean Hyland Motorsports). Is was also a 5.4. So it didnt have the RPM capabilities that the 4.6 has. MPH, MMR, Comp, Crower. Just talk to the tech guys and find out what you would need, and what will work best. Just know that if the cam is too agressive the valves will hit the pistons. I machined reliefs in the pistons to make sure I had enough clearance for valve deflection.

Now I'm just running a reletively stock 03 5.4 with just ported heads and intduction mods. No crazy engine work here.

Edit: On average a a pi swap alone is worth 75-80 rwhp.

flatheadz-forever

Wow thanks for all the info also do you know if a regular 4.6 f150 pi swap is do able never really heard of it being done im sure it will but will everything bolt on and what special parts will i need

flatheadz-forever

Also what will my new compression ratio be with npi bottom end and a pi top end