347 stroker

[95wanttobe]

I have looked at the tech. help pages and read quite a bit of info on the 347, but was looking for first hand/user knowledge as to what is the best way to build a 347. Whomever put the tech. pages together did a great job!!!
Just bought a used 95gt, but have another 95 engine in my garage that I want to build up.
1. Looking at stroker kits, is one substantially better than another, which is best to use.? Looking at flat top pistons in general. How can I make this a 4 bolt. Do I need a girdle.
2. looking at afr 185cc heads or the victor Jr. stock #77189 ?. Maybe gt 40 and port them??
3. Performer or typhoon upper and lower intake.
4. 70mm tb---65mm/maf.
5. Using good rocker arms lifters etc should be ok here.
6. cam recommendations for a street/strip application.? Looking at comp.
7 24#injectors, new fuel pump and oil pump. Wires etc, etc

I know there are other things to consider but just looking for comments from people that have been there, done that.
Thanks, my first post by the way.

 

[final5-0]

I have looked at the tech. help pages and read quite a bit of info on the 347, but was looking for first hand/user knowledge as to what is the best way to build a 347. Whomever put the tech. pages together did a great job!!!
Just bought a used 95gt, but have another 95 engine in my garage that I want to build up.
1. Looking at stroker kits, is one substantially better than another, which is best to use.? Looking at flat top pistons in general. How can I make this a 4 bolt. Do I need a girdle.
2. looking at afr 185cc heads or the victor Jr. stock #77189 ?. Maybe gt 40 and port them??
3. Performer or typhoon upper and lower intake.
4. 70mm tb---65mm/maf.
5. Using good rocker arms lifters etc should be ok here.
6. cam recommendations for a street/strip application.? Looking at comp.
7 24#injectors, new fuel pump and oil pump. Wires etc, etc

I know there are other things to consider but just looking for comments from people that have been there, done that.
Thanks, my first post by the way.

Hello and Welcome to 94-95 :SNSign:

A few of my thoughts about your plans would be ........

How much power you are wanting to make
and
Is this your daily driver or just a weekend toy

Never the less ... I see a couple things I can comment on

#1 I'd think trying to make a 4 bolt from an OEM block would not be
cost effective

#2 I don't care whatever one might do to OEM GT40 heads ......
I'd not put em on a 347
Better flowing heads such as you have listed seem more suited

3# The Edel Performer is in the group of longest runnered intakes
thus
It is gonna choke down a 347 on the high end
therefore
I'd do a mid length runner such as you have listed or something similar

4# I'd go up in size with both the tb & meter

5# I'd want stud mount rr's as opposed to ped mount

6# I'm a firm believer in Custom Cam as you get the benefit
of the knowledge of the cam Guru of your choice about the
cam and the rest of the combo parts as well

7# 24lb injectors are too small for a 347

Several here have done strokers so I'm sure you'll get some input
that will be more beneficial than the general stuff I've shared here

Also ... You'll need a way to tune such a combo :Word:

Grady

 

[Grn92LX]

1) The basic scat or probe 347 kits will work fine. You do not need a forged crank.

2) afr 185s or victor jrs wil make great power on a 347 and can easily do over 400hp under 6000 rpm.

3) holley, rpm II are what you should be looking at

4) 75mm tb, 80mm maf minimum

5) stud mount rockers (3/8 or 7/16") and stock style lifters will be fine

6) www.flowtechinduction.com

7) 36-42lb injectors (i'm running 30's on my 347 and they're 100% maxed out) 255 fuel pump, melling oil pump or a blue printed pump from FTI

 

[5spd GT]

Choose an AFR 185cc head. They are one of the best deals for everything you get.

Lighter valvetrain, accurate flow numbers and profiles, and FULL CNC ports and chamber, not one or the other, like a lot of the competition.

Always get 7/16" studs. Do not cheap out on 3/8", when it is only $30 more. It also allows for a more aggressive lobe.

 

[95wanttobe]

Thanks for the info, I'm looking for at least 400+ hp at the flywheel. Is efi the way to go, I know a good tune is in order after I'm done building. This is going to take awhile I'm afraid. Thanks again.

 

[final5-0]

Thanks for the info, I'm looking for at least 400+ hp at the flywheel. Is efi the way to go, I know a good tune is in order after I'm done building. This is going to take awhile I'm afraid. Thanks again.

I'd not do a carb in a 94-95

400 at the motor is only 340 at the wheels (stick trans @ 15%loss)
so
That is a VERY mild 347 stroker

You should not have any trouble reaching that level

Grady

 

[revhead347]

My 347 makes about 425HP (372 to the wheels) at the motor with a slight dish piston. I'm running a Canfield head though, which flows a little better that an AFR 185. If you are a little limited on cash, I would try to find a used Canfield or Trick Flow Head. Much better bang for the buck. I'm using a Systemax 2 intake and a Trick Flow 3 cam. You really don't need a 4 bolt engine for a street car. Odds are you won't be turning that much rpm anyway. The only realistic way of doing that is stepping up to an expensive aftermarket block.

Kurt

 

[95wanttobe]

So I'm still dicking around with this 347 thing but getting down to the end of what I want to do.
347 stroker with forged crank and mahle flat top pistons. Also a girdle. Around 10.3 compression.

afr 185 heads, with alum. roller rockers 1.6--using 7/16's. Do I need a spring upgrade??
Good set of push rods.

75 mm tb 90mm maf set up for 36# injectors

edelbrock rpm II upper and lower. Question ---does typhoon have anything that flows as well as the edelbrock. ??

Cam looking at either going with FTI or possibly-- comp cam XE282HR, I have seen this cam in three seperate builds.

3.73 gears 255lph fuel pump.

Comments, anything wildly wacko here.

 

[revhead347]

Save youself some money and weight and skip the girdle. It won't do anything for you.

Kurt

 

[SVTCobra306]

I'm running a girdled '71 block 347 in mine. I have AFR 185's, an FTI cam TFS R intake, Foxbody 75mm TB, and an 80mm LMAF. Decent combo but my cam was not ground for what I am doing with it. My current combo with a comp 282 cam would be VERY close to 400 RWHP.. that has been done many a time. My signature numbers were with a stock Cobra upper and very thoroughly Tmoss massaged lower.. with the TFS R intake and no other changes I went to 343 HP and 343 TQ. Don't be alarmed at the 30 lb loss of torque. It is only over a 400ish RPM range, down low I am only down 5-10 lbs compared to the Cobra, and in exchange for a small loss below 3500 RPM I gained 40 lbs at 6000 RPM.. my curve carries well into the 6K range now where it used to absolutely take a dump at 5100 RPM. Also.. my compression is only 9:1.. it might get a T trim down the road

Honestly if I did it again I might have gone with 205's.. but the 185's with a 282 cam will be a great street combo when I switch to it. I am considering another custom though. The drivability of my current cam is phenominal.. except at very low RPM in 1st, the car drives like a stocker with a 150 shot always turned on...

Typhoon does not make anything that flows enough for a 347. The only intakes you should be even considering IMO are the RPM II, Systemax II, and TFS R (not box R). My vote is TFS R.

36 pound injectors are a bit of overkill. I am getting along great with my 30's.

 

[Pokageek]

"The drivability of my current cam is phenominal.. except at very low RPM in 1st, the car drives like a stocker with a 150 shot always turned on..."

Like a turbo kinda? Mine drove like this b4 I put the LT's on.

 

[final5-0]

36 pound injectors are a bit of overkill. I am getting along great with my 30's.

I'd not dispute you are not making things work with those 30's

I would wonder if you got any hard data showing duty cycle under
maximum load

Now ... if you are working those 30's at elevated pressure
Of course ... that will make them act larger

Honestly ... If one builds a stroker ... Its almost a given

They are gonna custom tune

If so ... I'd do OEM pressure and go up with inj size

At OEM pressure ...
On a 347 Stroker ......
I'd not sleep good at night with 30's

anyway

different ways to skin a cat as they say

Grady

 

[Grn92LX]

I

At OEM pressure ...
On a 347 Stroker ......
I'd not sleep good at night with 30's

I see 94% duty cycle before I see a shift light with my 30's @ a hair higher than stock pressure. Maxed out

 

[Killercanary]

I don't know why I'm different than a lot of you guys but I made 380rwhp on 24's at 45lbs of fuel pressure, but I have since switched to 30's after swapping in the AFR 185 heads. My pressure is still 45lbs though and my duty cycle IIRC was ~75-80%.

 

[SVTCobra306]

Next time I'm at Randy's on the dyno I'll have him datalog my duty cycle but I'm at 42 PSI and had no blips or dips in my A/F graph.. I did max out a 75mm Pro M meter..

I've seen plenty of 350 RWHP setups on 24 lb injectors though.. IIRC by math that's about where they max out, 30's are closer to 400 RWHP. I'll have to dig up the old formula..

 

[final5-0]

I base my thought process on pcm access

If one has access to the pcm they can duplicate how Ford does it

Tune at 39 lbs of pressure

You have total control of all fuel parameters ... that is a given
therefore
Why would you not want to run an inj large enough to ensure safety

Grady

 

[revhead347]

I'm running close to 400rwhp on my 30lbs on close to factory pressure. They work fine. My car actually runs a little on the rich side.

Kurt

 

[Grn92LX]

I'm running close to 400rwhp on my 30lbs on close to factory pressure. They work fine. My car actually runs a little on the rich side.

Kurt

Its not about how it runs or feels, its about the duty cycle. My car runs great too with my 30's but 94+ % duty is FAR from good I'm a little over stock pressure too. 42's would be the ticket for me. Not sure of my rwhp, i'd guess around 385-400 on a Mustang dyno?

 

[revhead347]

High duty cycle isn't necessarily a bad thing. I'm sure when I spray it my injectors are locking open anyway.

Kurt

 

[Pokageek]

Its not about how it runs or feels, its about the duty cycle. My car runs great too with my 30's but 94+ % duty is FAR from good I'm a little over stock pressure too. 42's would be the ticket for me. Not sure of my rwhp, i'd guess around 385-400 on a Mustang dyno?

Its not about how it runs or feels OR guessing on the dyno. Go have it tested and then tell us.