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smoothed and filled red pearl 94
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Discussion Starter #1
this winter i am gathering parts for a full PI top end swap in the spring and would like some guidance from those that know. i have a 94 in great shape with a little over 100k on the clock. if i were to use the PI manifold with PI cams and NPI ported (mildly) heads, would this be a swap worth my time? i say NPI heads so as not to raise the compression (plus theyre affordable). i know there are a bunch of little things to make these parts fit/work (ie alternator bracke, TB, etc), but i just have not seen a lot of info on this swap on a 94. also, what are the chances my valves will need to be replaced? i know the seals are a safe bet to replace, but how about the actual valves? is there anything i can do with the rockers when rebuilding the heads like a better ratio? what am i overlooking here? thanks for any input

-John
 

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High-Mileage 4.6L Thrasher
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3,232 Posts
this winter i am gathering parts for a full PI top end swap in the spring and would like some guidance from those that know. i have a 94 in great shape with a little over 100k on the clock. if i were to use the PI manifold with PI cams and NPI ported (mildly) heads, would this be a swap worth my time? i say NPI heads so as not to raise the compression (plus theyre affordable). i know there are a bunch of little things to make these parts fit/work (ie alternator bracke, TB, etc), but i just have not seen a lot of info on this swap on a 94. also, what are the chances my valves will need to be replaced? i know the seals are a safe bet to replace, but how about the actual valves? is there anything i can do with the rockers when rebuilding the heads like a better ratio? what am i overlooking here? thanks for any input

-John
Can't swap PI cams into the '94-'95 heads-there's not enough lift capability on that casting. there are no aftermarket followers(rockers) with a different ratio-stock is all you have to workwith.
If you want to do the PI cams-you're gonna need a '96-'99 F5AE casting NPI head, along with a set of fuel rails, throttle body and inlet elbow, throttle body cable, cruise control cable, etc, etc...
JL
 

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Chapter Director Coordinator
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6,253 Posts
a headswap is a lot more labor intensive that an engine swap

flow would be a little better, rebuilt heads generally reuse the same valves, they just replace the seals and anything that is worn out of spec

as far as the "rockers" none available that i'm aware of. if you do decide to do a headswap, don't forget the FRPP head changing kit. comes w/ head gaskets, exhaust manifold gaskets, and new headbolts
 

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Super Moderator
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then its not a PI "top end" swap if you're using NPI heads ...hehe :)

besides, you'll need 96+ NPI heads to accomodate the lift on the PI cams...PI cams wont work in earler NPI heads because the coil gets binded

but regardless, depending how good of a port job you end up getting, with a good tune, you should see a minimum of ~215 rwhp....i say this because i made 216 rwhp SAE on PI intake/cams/tune........if you bump up the compression, you could see close to around 245 rwhp.....most people who do FULL PI top end swaps see around this figure because 10.5:1 will sure make more power than 9:1.........again, all this depends how well the heads are ported, if at all

there is very little chance your valves will need to be replaced, but with a port job you usually need new valve seats and for them to be properly machined......there is extra airflow/power to be had with a good 3-angle valve job, and also with some aftermarket undercut valves

not much you can do about the rockers.....aftermarket ones (with the same ratio) are available from Jesel, but they're $100 a pop, and wouldnt net you anything at your projected power level/RPM operating range
 

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smoothed and filled red pearl 94
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Discussion Starter #5
cant do the whole thing

i'd love to swap the engine, but i live in an apt and have limited money. james d, are the heads you have the 96-99 or the older style? more questions to follow... gotta go to work. damn you guys are fast for a tuesday morning, though. thanks

-John
 

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Chapter Director Coordinator
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they are 96+

i don't know anyone who lists their 94-95 heads out of embarassment
 

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3,391 Posts
I have a pair of 98 GT head with stock cams. I can sell them to you if you want them..
 

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Registered
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you can't put pi cams on 94-95 heads, you can swap pi cams on 96-97 heads, the PI cylinder headswap with PI cams and the PI intake would be your best bet though, theres not really a whole lot of room for improvement on the 94-95 heads because of the bad valve angle, spring bind, restriction,etc... let me know if you have any other questions I should be able to help you through it.

Regardless of what you pull the PI heads from you need new valve stem seals, they are worth the price while they are off the car, also because you are doing this on a 94 you need a lot of the top end components from 96-97 bird, things like fuel rails, TB, Plenum, EGR Valve, PI coolant tube, PI coolant nipple, PI intake manifold gaskets, etc...

Like I said feel free to PM me with any questions.
Thanks,
Chris_Murder
 

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smoothed and filled red pearl 94
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631 Posts
Discussion Starter #10 (Edited)
alright

current plan: pi manifold, pi cams, 96 cast npi ported heads w/ some valve work as well.
the questions: on my 94 manifold, there is a line running from the pcv valve to 2 ports on the back. my new manifold does not have 2 said ports. is this something i can take care of with 97 bird parts?
i know i will need the actual egr valve but will i need the tube running from there to the exhaust manifold?
do i need the 97 tb or will mine bolt to the new plenum? throttle/cruise cables are ok, right?
with the pi cams, will stock npi parts (ie valve springs) be adequate?
at 100 k the timing chains are a must, no?
in the tech articles, it mentions cleaning the carbon from the tops of the pistons.... is this really a good idea?
pi or npi gaskets? prolly npi with rtv right?

you wanted questions, you got questions. and i have searched, but for a 94 engine, this does not appear to be the most common swap. thanks

-John
 

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High-Mileage 4.6L Thrasher
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3,232 Posts
current plan: pi manifold, pi cams, 96 cast npi ported heads w/ some valve work as well.
the questions: on my 94 manifold, there is a line running from the pcv valve to 2 ports on the back. my new manifold does not have 2 said ports. is this something i can take care of with 97 bird parts?
i know i will need the actual egr valve but will i need the tube running from there to the exhaust manifold?
do i need the 97 tb or will mine bolt to the new plenum? throttle/cruise cables are ok, right?
with the pi cams, will stock npi parts (ie valve springs) be adequate?
at 100 k the timing chains are a must, no?
in the tech articles, it mentions cleaning the carbon from the tops of the pistons.... is this really a good idea?
pi or npi gaskets? prolly npi with rtv right?

you wanted questions, you got questions. and i have searched, but for a 94 engine, this does not appear to be the most common swap. thanks

-John
The valvesprings from '96-present on the 2V's are the same spring-the installed height is different on a NPI and a PI head.
Not really any reason to change the chains-they're good for 250-300K miles easy.
PI gaskets with RTV on the edge of the coolant port.
You'll need all '96-'97 parts-TB,intake elbow,EGR valve,EGR tube,IAC,etc,etc,etc...
JL
 

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Chapter Director Coordinator
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you can get the 02+ explorer EGR tube if needbe, it is a good fitting part
 

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PostWhore, The AFDB is on a lil tight.
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Im kind of in the same boat here with the swap only that I plan to buy PI heads complete. I am getting the gist of what I need to swap. Its the little small stuff that I dont see a list for. I know Im not a real certified mechanic and some may say what biz do I have trying this but Im learning slowly but surely, its exciting to me. This board is great help with the 100 million questions I ask. Im buying up the big stuff right now(high $ pieces), but anyone have a list for the little things. The small things you have to grab from the 96-97 at a junkyard. Maybe a pic with arrows pointing the hoses out or something. My plan was to take everything from the top end of a 96-97 at a yard and leave the big stuff Ive bought. In others words its the "etc etc etc" JL mentions. Oh and new head bolts is good idea? Any other small things that you should not reuse or replace? New Gaskets is already on my menu. I figured 94MN1246 may have similar questions.
 

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SuperNewbie
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2,869 Posts
Im kind of in the same boat here with the swap only that I plan to buy PI heads complete. I am getting the gist of what I need to swap. Its the little small stuff that I dont see a list for. I know Im not a real certified mechanic and some may say what biz do I have trying this but Im learning slowly but surely, its exciting to me. This board is great help with the 100 million questions I ask. Im buying up the big stuff right now(high $ pieces), but anyone have a list for the little things. The small things you have to grab from the 96-97 at a junkyard. Maybe a pic with arrows pointing the hoses out or something. My plan was to take everything from the top end of a 96-97 at a yard and leave the big stuff Ive bought. In others words its the "etc etc etc" JL mentions. Oh and new head bolts is good idea? Any other small things that you should not reuse or replace? New Gaskets is already on my menu. I figured 94MN1246 may have similar questions.
I dont know the exact location of the threads, but if you search "PI headswap" or "PI swap" you'll find it. You'll have to read a bit, but its all out there. Im pretty sure you need the fuel rails from a 96/97 car, the intake, throttle cable. Basically the 94/95 intake setup is totally laid out different than the later years.
 

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John
id say just get PI heads, by the time you spend money on NPI heads your not so far away from PI heads , and labor to swap heads are the same...so id check ebay or around here if i were you...but its JMO

Or you get get a converter first before the PI swap , thats what im doing. A converter will help more than a PI swap...
then when you do PI your be making use of the power

but GL either way , me and Chad will be doing complete PI swap and torque converter on my car first of next year...

if you have any questions ask!

ed

PS...i herd a funny story, how the smooth and filled came to be LOL uh does it have to do with a police car and your car meeting???? :D
 

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PostWhore, The AFDB is on a lil tight.
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3,868 Posts
What is the general preference for head bolts. Ford vs ARP. Im not supercharging so will a Ford brand be ok? ARP is a solid brand, are they close in price to ford? Sorry for such newbe questions but Id like to by the optimal things. Thanks for being so quick guitar maestro.
 

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Felpro's are also not reuseable, although I've used them in most of my swaps, they run about $65 for the set, fords are cheaper, although I like the permatack felpro headgaskets over the ford headgaskets, just don't move around as much, they are also more expensive, go figure :rolleyes:
 
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