[DPadTTID]

I am looking for help on my Fox body 347 stroker build now that I have the money saved up. Have already bought a Scat 347 kit (SCAT Engine Components 1-94165BE - Scat Engine Rotating Assemblies - Overview - SummitRacing.com) with the cast crank, an E303 cam (Ford Racing M-6250-E303 - Ford Racing Camshafts - Overview - SummitRacing.com), Ford Racing pushrods (Ford Racing M-6565-L302 - Ford Racing Pushrods - Overview - SummitRacing.com ), Cobra intake (Ford Racing M-9424-Z51 - Ford Racing Cobra Intake Manifolds - Overview - SummitRacing.com), 3:73 gears (Ford Racing M-4209-F373N - Ford Racing Ring and Pinion Sets - Overview - SummitRacing.com), MSD 6AL ignition (MSD Ignition 6420 - MSD 6AL CD Ignitions - Overview - SummitRacing.com), MSD cap and rotor (MSD Ignition 8482 - MSD Distributor Cap and Rotor Kits - Overview - SummitRacing.com), and BBK cold air intake (MSD Ignition 8482 - MSD Distributor Cap and Rotor Kits - Overview - SummitRacing.com) as well as a Ford aluminum drive-shaft.

I plan on using AFR 185cc heads along with Scorpion rockers because I have heard that they are the best. I also have an older Paxton head unit that needs to be gone through but I hope can be rebuilt. If it can be rebuilt, I might run 4-6 PSI at max.

I was wondering a couple of things like what block should I buy that can hold the power? Would like to have more fun with a 5 speed but heard I will go alot faster if I have an auto. If so, what kind of auto trans should I be looking to buy?? What suspension and fuel system mods will I have to make this car do its thing?? Also, with the 347 kit that I have with a cast crank VS having a forged crank, how much power do you think it will be able to handle??

I am trying to build a Fox that goes extremely fast and want it to be reliable as well as in the 10 second to 12 second range... If you see any faults in any of the parts I have purchased that will hurt me in the end with power and reliability, I would appreciate it if you please tell me

Wondering how this typical sort of setup in a Fox does and what all has to be done. Also, what kind of numbers do you think it should approximately get for HP, torque, ETs...

Also, I just moved from Florida and don't know anything about how to pass emissions for here in NJ or PA if I move there soon but I want to get the car done.


I appreciate any info from you guys helping me out... I know I haven't been on this forum in almost 2 years but that is because I had to save up a whole bunch of money

[ryanw]

buy a DART block they kick ass and will hold what ever power you through at them.

If you stroke a motor plus add a good set off heads and intake, cam and then on top of that add apower adder such as a supercharger/turbo/ nos you will go over the horse power limit of the stock engine block. and run the risk of breaking it and damiging your rotating assembly. some people get lucky and run all sorts of high horse power through a stock block with out them breaking but to be that playing russian roulette.

good after market blocks are DART, ford BOSS block, world products man O war block

if you have a old paxton SN89/92/93/2000 supercharger, put that piece of crap on ebay and sell it right away and buy a paxton novi or vortech...there much better

as for fuel system, if your just going to stroke it then 255lph fuel pump and 30lb injectors. if your doing every thing then 255lph pump and 42lb injectors but depending on the horse power you end up with bigger injectors maybe needed

[horsepowerjunkie]

The cam & intake are very small for a 347. You might want to consider a custom cam or something like a Comp XE274HR, Comp's also got a few blower grinds, as does Anderson Motorsport, but for $50 more you can get a FTI custom cam. With a 347 I'd to Holley Systemax or Trick Flow R intake. If you go with the 58cc AFR 185 heads, you're going to be over 10:1 compression, a little high for a street car with boost. I would get the 70cc version to get you to 9:1 or less. I'm also with ryanw, get rid of that early paxton and buy yourself a Vortech or Paxton Novi!

[DPadTTID]

Yeah I kind of figured that the older headunit (SN93) is going to be an older component but think that I won't have the money to get a newer one after everything is said and done.

I know that I should go with lower compression heads if I have it blown but was wondering how much the 9:1 vs the ones over 10:1 will make HP wise until I am able to bolt on the supercharger.

I know that the stock block isn't going to be able to hold that power if I am serious about this build. Damn it sucks because even a Boss block is like $1600 and Darts are a few hundred more. I know that it costs $ for HP but damn... Haha.

Now I am looking at around $3k for the block and the heads and probably another $500 or so for the right intake & cam. Then the trans and suspension mods which I have no idea what I will need or what they are going to cost me...crap

[ryanw]

this not a cheap hobby...lol

i have about 6500 into my motor, maybe a little less

[69fastback]

Please don't put a letter cam in a 347.


You should probably nail down the goal you want to run the car first. There's a whole lot of difference between 10s and 12s.

[DPadTTID]

Originally Posted by 69fastback Please don't put a letter cam in a 347. You should probably nail down the goal you want to run the car first. There's a whole lot of difference between 10s and 12s.

I started purchasing all of the stuff way too early and wasn't thinking... Just saw a setup on my friend's old car and figured it was a little fast. Big mistake but yeah, what's done is done...atleast. I can hopefully sell what I bought considering it is still brand new.

Don't know what kind of HP and times the cast crank will hold up to in my kit... My brain (don't know if it's all there or not) tells me I want to run 10's. Not faster...just somewhere in the 10s.

RyanW - What are you gettin as far as HP and 1/4 with your setup?

[ryanw]

im only on my second tank of gas so, i figure once the engine is broken in and i get it tuned the gas milage will go up a little but as of now it looks like 13-14 mpg but thats with a lot of idle and reving time in there. not to mention my O2 sensors are old, i just bought some new ones off ebay 40 bucks (for two new ones, i havent put them in yet)

[Danno]

I just picked up a '92 Fox Body with a 347 stroker in it last month. I can tell you that the stock computer isn't going to give you the performance that you're hoping for - mine's in the shop now getting a tune and a custom chip burned to compensate for this. When they tune it, they also give me a dyno readout, so I'll post the results in the next week or so when I get the car back to give you an indication of horsepower range, given my setup (YMMV of course).

The guy I bought this car off of had $20k in the motor and "spared no expense" in building it. As a data point to compare to (not necessarily advice), I've got a 255lph fuel pump and 30 lb injectors, as well as a custom ground 351W cam from Comp Cams. I'm running 11:1 compression, but have no plans for power adders. I'd be happy to tell you more about my setup, but I'm not in the position to be giving anyone advice, considering I'm just now getting back into Mustangs after a 13 year hiatus.

[69fastback]

That cast crank will be just fine. The block will break before it.

[DPadTTID]

Originally Posted by 69fastback That cast crank will be just fine. The block will break before it.

Will the block still go before the crank if I have an aftermarket Boss or Dart block?

[69fastback]

Originally Posted by DPadTTID Will the block still go before the crank if I have an aftermarket Boss or Dart block?

No, not then.

[DPadTTID]

ThanKX for the quick response. Just tryin to find out if I stick with the cast crank and have 800 hp max if I will be ok with that crank and also what auto trans I should be looking at...

[69fastback]

If you're honestly looking at making a true 800hp, ditch the cast crank....lol

[ryanw]

Shit man that a lot of horse power. That's going to cost you. You better get forged crank , h beam rods, dart block. Then a big ass supercharger. And some really good flowing heads and intake. Good luck

[brought_pain]

Keep this in mind, a 347 is a few cubes shy of a 351. That said, parts that would support the power levels you want from a 351 is a good place to start. No a 302 intake won't fit a 351, but some 302 intakes breathe enough for a 351. Heads starting in the 185 range rather than 165/170.

That cam and intake is too small. I forgot the rule of thumb for cams regarding but I think its like every 50 cubes eats up 5-12 duration. Like I said though, I don't recall... Point being, lift depends on the heads, and a lot of duration for a 302 isn't a lot for a 347.

Stock, cast and big power usually go together like rap music at a KKK rally. Forged internals with a dart block will handle 800+ easy if they're good, high quality, expensive as internal organs(if you know a place to unload some extra parts, please tell me.),parts.

I have scorpion rockers on my Tfs 170s and its a shame to cover them up.

[DPadTTID]

Should this still apply for the cast crank being ditched for a forged one if if I set my goal at around 700 HP? Yeah I accept that the cam and and intake aren't going to be suitable for my needs so that's why I'm not going to do any more purchases until I get a ton more info.

I love the rap music comparison "brought pain"...haha.

[thisguysride]

truth be told, if you are this unsure of what parts, you should prolly start looking into shops, get all the info on your local shops find out who is the best and go to him tell him what your after and let him build the motor, your going to have to have them machine your block any way and you got to remember, this is all these guys do is build hi porformance motors. tell them your goal. decide weather or not if your supercharging or not because that makes a huge difference, even if its going to be a while before you can afford a charger you need to build the motor for it, theres a huge difference in the build. talk to the guys at the shop thow, dont just walk in tell em to build a motor and walk away. talk about your ideas what parts your thinking about using get their input. even the altitude of where you live determins what cam you should run. most people just order the largest cam. im not putting any one down on here for their advice at all im just saying if your new to building motors have a profesional shop help you, but do a shit ton of research on them as well. if you have local race tracks go find out who they have build their motors. and yes they do have someone build their motors. find out if the shop is capable of doing a line bore. not everymachine is capable of it and if your looking at that much power you should have it done. another things is once your that far, have your intake ported to match the flow of your heads. if you want to do the build up your self have the shop build the bottom end then assemble the top end your self. if your anywhere near colorado i know a couple shops you can go to.

[uedlose]

Originally Posted by 69fastback Please don't put a letter cam in a 347. You should probably nail down the goal you want to run the car first. There's a whole lot of difference between 10s and 12s.

all come on it IS ONLY 2 SEC>







good place to start here

[uedlose]

I would not put a cast crank in a High dollar block and I would not put a good forged crank in a stock block. kind of like putting a band-aid on a amputation IMO.