This is topic possible 400rwhp? in forum Tech Talk at Northern California Ford Owners .
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Posted by built95faleen (Member # 8828) on
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alright guys i have been building a 347 for a few years now. i have the short block done and the heads are getting touched up as we speak(afr 185s). i would love to have 400 to the wheels safely on pump gas, n/a. can this be done somewhat easily? and what components do you suggest to finish my combination.
Posted by built95faleen (Member # 8828) on
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my biggest questions are about the cam and intake.
Posted by SmokinLX (Member # 1684) on
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Holley systemax intake "port matched", custom fti cam, long tubes with no cat h pipe and cat back, titanium keeper's and make sure the valve spring's are suitable for cam, underdrive pulley's, 75 mm TB with spacer, 80 mm pro m meter, msd box, 255 intank pump with 30 pound injector's.
Posted by built95faleen (Member # 8828) on
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already have the 30 pound injectors, maf, box etc.. i am running shorties however and really dont want to change that. i like the trick flow intakes and was wondering if anyone was running the r series on the street. also how much do custom cams run and are they worth it? do you guys think the my heads are good for that hp na?
Posted by Camara90 (Member # 134) on
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Did you tell Ed your goals? If so, it souldnt be a problem. What are the cam specs? Also I would want bigger injetors, but they will work.
Posted by built95faleen (Member # 8828) on
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most of the street driven n/a 347s im seeing are around 350-370ish. havent seen to many above that
Posted by SydeWaySix (Member # 3596) on
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hey bro, are you swapping the 331 for a 347? just wodnering if this is going into the car i'm thinking of... ![[Wink]](wink.gif)
Posted by x42bnx (Member # 9529) on
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The biggest factor to 400 RWHP, cam choice and what will be done to the heads.
Posted by copcar (Member # 10113) on
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400 is really no great feat but make sure you do it the right way. BTW, anything other than SAE correction factor does not count. Why?, STD correction is roughly 4% higher than SAE.
What MAF are you running?
What is being done to your heads?
Compresion ratio? Most guys with 4C+ run 10:1 - 10.5:1
Shorties will get you there but I would recommend 1 3/4 shorties.
Exhaust? 3" would probably be best but not necessarily mandatory.
Metal substrate cats if you are going o run any at all.
The 30's are the only real sticking point I have with your combination. 36's minimum. 42's would be ideal. You can cheat the 30's there with fuel pressure but I HIGHLY advise against it.
Posted by CobramanPhil (Member # 2170) on
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I'd say custom cam and perhaps some good work with the 185s you have, but the shorties are going to choke things off at this level. Go LTubes for sure at the very least.
Nothing wrong with the TF R intake....
Posted by Luke87GT (Member # 21) on
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If it were me...
- Make sure that motor has compression (10:1 - 10.5:1)
- For a street application, I'd do a RPMII intake and have it matched to the heads. For more of a race application, I'd do the shorter runner length intake from Edelbrock.
- Cam - Hi-Tech in Michigan. Tell them your expectations.
- Make sure you have the fuel (I'd use more injector than 30s)
After that, full exhaust, pulleys, CAI, 75mm TB, MAF, tune, and you should be there.
Plenty of guys have made 400-450rwhp with their NA 347 on pump gas
Posted by built95faleen (Member # 8828) on
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thanks guys. and yes sydeways its going the gts. the maf is a pro-m. im not sure of the type of fuel pump it has but what would be a minimum to supply this car? and the heads are just getting touched up(decked, lapping in the valves, checking guides and spring pressures you know that sort of thing). wasn't planning on doing any porting. and the compression is going to be around 10.5 to 1. maybe as high as 10.75.
Posted by need-a-cage (Member # 5415) on
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I would say more like 375rwhp. That will be a fast car though! It can run a high 11 with that power.
Get the custom cam. Mine was only $325 shipped. However, you will most likely need to get springs that match the cam. You should do this now so they can set up your new springs with the correct pressures that your custom cam guy specifies. I would get the Eddy II intake and shoot for 10:1 compression. That will get you really close with an electric fan and long tubes. The shorties will drop you down a little. To get over 400rwhp I think you have to start doing port work and use a really light valve train. Basically, spend lots of money. Off the shelf parts will get you damn close though. Mine only made 320rwhp but it still felt good and ran 12.30. It did have 355rwtq. It is much better with the blower though! This is a 9:1 motor with tiny heads, tiny intake, and a smog legal blower cam with shorty headers.
Good Luck!
Posted by forced331 (Member # 1270) on
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For the intake I run a TFS-R on the street with a blower and has good street driveability. Below I attached a EFI intake flow rating (CFM) I found on the Corral.net forum. For N/A motors it is good to have close to the same intake cfm as to your heads.
Intake Avg CFM Source
Stock Upper 188 Dec 00 5.0 Mag "Power Naping"
Stock Lower 145-150 XSR Cylinder Heads SF600
tmoss lower 195 XSR Cylinder Heads SF600
Saleen/Vortech 180 Super Ford
GT40 205-210 Super Ford, Victory Engines
Cobra 205-210 Super Ford
Explorer 205-210 Victory Engines
Performer 220-225 Super Ford
Performer RPM 230 Victory Engines
TF Street Heat 245 Trick Flow
TF Track Heat 265 Trick Flow
TF R 290 Trick Flow
Victor Jr 320
Super Victor 375
Holley 300
Holley systemax II 259 (average)
Edelbrock RPM II 260 (average)
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