using gt40 heads an intake on my 347 stroker??

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using gt40 heads an intake on my 347 stroker??

Unread postby 1990gtVortech » Thu Sep 17, 2015 12:10 am

I have Stock block with 347 stroker kit. scat crank, h beam rods, probe forged flat tops with valve reliefs. engine builder is currently getting it worked and assembled. shooting for 10.5-11.1 compression ratio with main girdle windage tray and all the goodies. i have gt40 alum. heads with 1.6 rockers an gt40 intake on the engine that is currently in the car. I'm strongly considering having the heads and intake ported for the 347 were building. i know i know I'm using 302 parts on a 347... but budget and streetability are first in mind. i would love to put the vortech back on, just not sure which direction to go??? . also i have dark blue injectors not sure of the lbs size.? again I'm trying to save money and keep it somewhat comfortable for street driving since its primarily a weekend cruiser that will go to the track maybe couple times a year. SO VORTECH THE 347 WITH LOW BOOST??? OR GET NEW H/C/I AND NO BOOST??? ALSO WHAT INJECTOR SIZE .should i go with fOR MY CanL 78mm. any cam suggestions??? I'm a little lost any help would be greatly appreciated.
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Re: using gt40 heads an intake on my 347 stroker??

Unread postby 1990gtVortech » Thu Sep 17, 2015 12:14 am

and I'm getting other necessary parts to do the swap like clutch( any suggestions) and 255 fuel pump, high flow fuel rails, adj fuel press regulator etc etc. shooting for 400/400 maybe 450/450???
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Re: using gt40 heads an intake on my 347 stroker??

Unread postby StangD » Thu Sep 17, 2015 6:29 am

I understand the budget thing. If you use those heads and intake on a 347 you'll probably end up adding the blower later because the power goals you posted are very unlikely to be met NA. Not saying it won't make some torque and be real fun to drive because it will. It's just far more likely to hit about 350-360HP. A quality head in the 185-190cc range is generally considered to be the minimum standard for 400RWHP.

And I am using a Spec 2+ clutch and like it a lot.
94 Mustang GT-T5-347(Fordstrokers DIY)-TF190s,FTI Cam,Ported Victor EFI,42s-LMAF,85MM TB-Nitrous-Suspension mods and DRs.
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Re: using gt40 heads an intake on my 347 stroker??

Unread postby 1990gtVortech » Thu Sep 17, 2015 10:35 am

Thanks stangD for the suggestions. I think I'm going to put it together like this and hope for the best. i may change the cam and add my vortech this winter but i have the flat top pistons the CR may be a little to high 10.5-11.1 is what the engine builder said it will be aiming for... Unfortunately i got this stock block, and balanced stroker kit and all the other pieces with the purchase of the car so I'm trying to get the most out of my setup without breaking the bank. after this engine is built and installed i want to start building a dart block 347/or 363, with dish pistons and lower compression and a blower cam and of course afr205 or something comparable, then my car will see more track time and much less street.
In the meantime I'm building this 347 with the parts i listed above and hoping for a fast fun street car that can still law down some 12's?
HAS ANYBODY EVER PUT 6-10 PSI BOOST IN 10.5-11.1 COMPRESSION RATIO 347???
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Vehicle Information: 1990gt T-5 302 stock long block. cam?, Anderson power pipe Vortech v-1 10psi? longtubes h and flows dumped, gt40 intake, 1 inch spacer, msd 6 btm (old), C an L 78mm Maf, not sure of injector size? previous owner had tuned at alternative auto about three years ago.

Re: using gt40 heads an intake on my 347 stroker??

Unread postby decipha » Thu Sep 17, 2015 11:08 am

you dont need a girdle, adjustable fuel pressure regulator, or rails, you can save money there

them heads are only capable of flowing about 290rwhp on that engine, at the very least check out the gt40 intake porting write ups by tmoss on the homepage

http://tmoss.efidynotuning.com

Blue injectors are either 24s or 39s, chances are they are most likely 24s, good for 300rwhp

If your buying injectors just go straight for the simens deka 80 from chris at poweraddersolutions, its stupid to buy anything less

all of your inquiries were basically answered in the pre tune write up, if you hadnt already i highly rcommend you give it a read over, will save you a bunch of money

http://info.efidynotuning.com/pre.htm

6lbs on that setup would be roughly ~385 rwhp, you can do so safely at that compression since your cylinder pressure will be extremely low due to insufficient head flow

in your application, a stock cam would work excellent, you can retard it 4 degrees to move the power up just a bit but the biggest thing with your engine is low end torque, you cant get top end power out of it due to the heads so do all you can to improve the low end and it will make for a fun street cruiser/ daily red light racer

you can also toss a cam with a touch more duration and lift like an f cam or so, id recommend advancing it 4 degrees to move tge power down, but if you have the stock stick i recommend using it
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Re: using gt40 heads an intake on my 347 stroker??

Unread postby StangD » Thu Sep 17, 2015 11:23 am

decipha wrote:you dont need a girdle, adjustable fuel pressure regulator, or rails, you can save money there

them heads are only capable of flowing about 290rwhp on that engine, at the very least check out the gt40 intake porting write ups by tmoss on the homepage



I completely agree with the unnecessary parts on his list. All a girdle will do is collect the broken parts if the main caps start walking. I don't agree with the induction he wants to use but you are considerably light on the HP estimate though. Too many people have made 290 with a 302 shortblock and those supporting parts. A high compression 347 will do much better even choked off. The Tmoss porting suggestions are highly recommended. He can really wake up stockish parts and did so on my first combo.
94 Mustang GT-T5-347(Fordstrokers DIY)-TF190s,FTI Cam,Ported Victor EFI,42s-LMAF,85MM TB-Nitrous-Suspension mods and DRs.
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Re: using gt40 heads an intake on my 347 stroker??

Unread postby 1990gtVortech » Thu Sep 17, 2015 8:48 pm

Thanks for the info decipha and stangD. I read the T moss Intake porting stuff and the airflow horsepower info as well. great information there! I'm really glad i found this forum i feel like its going to be easier going through this build process with knowledgeable people willing to help with good recommendations from experience and reliable sources.
I think i will get the gt 40 intake ported and put the Vortech back on and drive it, race it, have fun with it!! and in the meantime I'm considering getting the dart block this winter and start building that for real hp and frequent trips to the track.
Anybody know how much T moss charges for gt40 porting?
does my upper plenum need porting as well?
I have C an L 78mm maf... what size throttle body is good for this setup?
What injectors will be best suited with my (347 gt40 setup)with the vortech v-1 at 6-8 lbs boost. 80lbs seems a little rich doesn't it?
sorry so many questions.
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Re: using gt40 heads an intake on my 347 stroker??

Unread postby 1990gtVortech » Thu Sep 17, 2015 8:53 pm

im looking for the article i read last week some guy had stock 5.0, paxton sc 10lbs boost, gt40 alum heads ported(same as mine), gt40 upper, e303 cam. and the article said he made 430hp if i remember correctly. let me look for this article and post the link. i figure my setup has more potential considering its 347 not a 302.
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Re: using gt40 heads an intake on my 347 stroker??

Unread postby quartermaster » Thu Sep 17, 2015 10:06 pm

HI. Like Decipha said go for the 80s he recommended. The flow on them is very accurate even at low pulse widths ( cruising ) and will have plenty of room for you to grow when you put in the Dart block. No sense buying different injectors as you go when the 80s will do all. With tuning you will only use the fuel you need Don't let the big number 80 scare you. Andrew
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Re: using gt40 heads an intake on my 347 stroker??

Unread postby decipha » Thu Sep 17, 2015 10:13 pm

1990gtVortech wrote:im looking for the article i read last week some guy had stock 5.0, paxton sc 10lbs boost, gt40 alum heads ported(same as mine), gt40 upper, e303 cam. and the article said he made 430hp if i remember correctly. let me look for this article and post the link. i figure my setup has more potential considering its 347 not a 302.


thats exactly what it should make, your setup with 10lbs should make 450rwhp no problem
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Re: using gt40 heads an intake on my 347 stroker??

Unread postby StangD » Thu Sep 17, 2015 10:29 pm

1990gtVortech wrote: Anybody know how much T moss charges for gt40 porting?
does my upper plenum need porting as well?


Tom can best answer those questions. He has literally done hundreds of GT40 intakes, and a number of every other SBF intake on earth. No exaggeration. He is a super guy and easy to talk too, If you want a wild guess a bit over $100 for a lower intake May not need to bother with the upper? If you are talking porting heads, quality work is always scary because it is time consuming to do it correctly. Price is usually scary enough to make you consider buying good heads that don't require it or boost it more.
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Pulling baby wheelies and breakin stuff.
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Re: using gt40 heads an intake on my 347 stroker??

Unread postby 88351stang » Wed Sep 23, 2015 6:58 pm

Man, reading through this thread really makes me wish I had chosen a different set of heads for mine. All part of the learning with a first engine build I guess.. :D
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Re: using gt40 heads an intake on my 347 stroker??

Unread postby StangD » Wed Sep 23, 2015 7:21 pm

88351stang wrote:Man, reading through this thread really makes me wish I had chosen a different set of heads for mine. All part of the learning with a first engine build I guess.. :D


Most of the GT heads are too small for a stroker if you want to fully utilize the extra cubes . A power adder will fix it for now though. :) My 190s are now considered too small for a 347.
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Re: using gt40 heads an intake on my 347 stroker??

Unread postby decipha » Wed Sep 23, 2015 7:27 pm

x2 Im a firm believer in getting baddest mack daddy heads money can buy
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Re: using gt40 heads an intake on my 347 stroker??

Unread postby StangD » Wed Sep 23, 2015 7:54 pm

decipha wrote:x2 Im a firm believer in getting baddest mack daddy heads money can buy


A lot of my engine building heros who used to preach small runner velocity over volume have came around to your way of thinking over time. If your intention is to turn some rpms it is no contest. Big heads with the right cam wins. That said, small headed GT40 stroker combos are still tire shredding beasts on the street.
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