When do you need 4V heads

I dunno bout like

NA, around 350

Blower/turbo, around 800

N20, i have no idea.

Stan Weiss said:

At what HP level do you need to change from 2V heads to 4V heads.

Click to expand...

You don't.

In an NA car go for it whenever, you should be able to benefit with modifications, but if you add in forced induction you dont really need them. sure they are nice and fancy and flow better haha, but i dont think it would be worth the effort and money.

In a FI'd car you don't...Didn't Tim at MPH just crack 900rwhp with his KB'd 2V?

Now NA thats a different story. Getting to 400rwhp with a 2V is tough and extremely costly and is much easier with a 4V.

I was wondering... is that all you need to do when going 4v? Bolt on the heads, cams, and intake and you're good to go? I thought it was some horrid process that wasn't worth it, but I don't really know.

I would just go FI if your gonna pump that much money into your car to do a 4v swap. Youll make more power with the FI too.

FalconGuy016 said:

I was wondering... is that all you need to do when going 4v? Bolt on the heads, cams, and intake and you're good to go? I thought it was some horrid process that wasn't worth it, but I don't really know.

Click to expand...

You need fully dressed heads, timing junk, timing cover, blah blah blah

id say anything over 800 too like bennyblown2v said but,if you got the $$$ or friends like i do, do like im doin "but" i dont think alot of people might agree ive got a set of n/pi heads at my buddys machine shop getting a full cnc machine port and polish bigger and hardened valve seats for bigger valves and is also machining new valves to fit and is going to bench flow for max and mached flow velocity between each runnerfor better performance. since hes a long time friend hes carging me for materials only and guarantees they flow more than the 3 and 4 valve heads and good for up to 1000hp (which i dont think ill see w/o power adders but imm close to around 450 to 475na hopefully with my bottom end combo hes helping me with) and can still retain a sohc witch means less valvetrain movement and parts for more torque and throttle response

BennyBlown2v said:

You need fully dressed heads, timing junk, timing cover, blah blah blah

Click to expand...

In other words not really worth it.

fast97gt said:

id say anything over 800 too like bennyblown2v said but,if you got the $$$ or friends like i do, do like im doin "but" i dont think alot of people might agree ive got a set of n/pi heads at my buddys machine shop getting a full cnc machine port and polish bigger and hardened valve seats for bigger valves and is also machining new valves to fit and is going to bench flow for max and mached flow velocity between each runnerfor better performance. since hes a long time friend hes carging me for materials only and guarantees they flow more than the 3 and 4 valve heads and good for up to 1000hp (which i dont think ill see w/o power adders but imm close to around 450 to 475na hopefully with my bottom end combo hes helping me with) and can still retain a sohc witch means less valvetrain movement and parts for more torque and throttle response

Click to expand...

Holy run on sentences(all 2 of them) Let me get this straight. You expect 450-475na on ported npi heads?

yep thats what im hoping. sorry for the run ons, i hate punctuality, but with forged steel crank, aluminum rods, and .020 over dome top pistons w/ valve reliefs, and the heads with bigger valves and ports (if you will) that you will be able to stick your fist in. but itll have a pi intake upper plenum and the rest of the mods that i already have. yep thats what im hoping

at 320 rwhp for any. or whenever you want to easily make this kind of hp.

http://www.corral.net/forums/showthread.php?t=636840


- - - - - - - - - - - - - - ***** THE OFFICIAL HP LIST*****
Z06KILLR (670 SAE) 5.4 DOHC, Ford GT Heads, Crower Stage III Cams, 2000 Cobra R Intake, 14lbs boost, no intercooler.

3blk98Cobra (661 SAE HP), on pump gas, 98 Cobra, 8.7:1 4.6 shortblock, ported stock 98 Cobra heads, twin 57mm HP turbo kit, SCT BA2800 MAF, MSD DIS-4, Accufab single blade TB, 72lb high imp inj, twin 255lph fuel pumps

1BAD98 (646 SAE HP) 98 Cobra, Built motor, Vortech JT trim with 3.10 ultra grip pulley, Stage 2 blower cams, ported and polished heads, 55lb injectors, TKO tranny, short runner intake (ported), no IMRC plates, weldon fuel pump, long tube headers with 3 inch pipes out the back. 103 octane gas, 13-14 psi.

SNAKBTN (603 SAE HP) 98 Cobra, Totally stock untouched from the oil pan to throttle body
S-trim with 2v impeller upgrade, 3.125 RR pulley 7800 rpms, RG

Blown01NJ (577 SAE HP) 01 GT w/ 2001 Cobra motor,Forged bottom end, P&P Intake, Vortech SQ (GT Impeller), 2.95 pulley, GI Joe 8-rib kit, AFM PP, Vortech mini race bypass, 60lb injectors, MD -8 fuel line upgrade,KB BAP, Wiring upgrade, Full Exhaust, 11.5's across the board 16* total timing.

VIPERBLUELX (560 SAE HP) 96 Cobra 283ci, Ported 01 heads, stock cams, stock intake, intercooled P1SC, 72lb injectors, 17psi boost, pump gas

VenomousSvt (548 SAE HP) 2001 cobra Forged shortblock Manley Pistons Manley Rods Coated bearings 9.0:1 Procharger D1-SC 12.5psi 3 core intercooler stock heads stock intake (for a few more weeks) stock cams

sc96cobra (530 SAE HP) 96 Cobra, forged short block 9.5.1 compression. Stock heads and Cams. Vortech V-1 upgraded impeller. 3.12 pulley with power pipe. BAS 42's injectors, 255 inline, 255 intank, AN-8 feed, AN-6 return.

Evan5469 (520 SAE HP) 98 Cobra, V-1 S-trim w/ aftercooler, Forged bottom end, stock intake, stock heads, stock cams, BBK long tubes, catted BBK H, MAC catback, 77 Pro-M, about 16 psi, 93 octane

JWBZSVT (514.6 SAE? HP) 01 Cobra, JMS built motor, stock heads & cams, vortech s/c 12 psi, intercooler/aftercooler, JMS built power pipe, Mac Lt's jet hot coated, Mac Cat-back, 42 lb injectors, 03 Cobra fuel system, 4.10's, JMS chip.

Blown97Cobra (508 SAE HP) 97 Cobra 4.6, stock heads, stock cams, stock intake, Vortech V-1 w/ GT impellar upgrade, Snow Performance H2O Injection 55lb injectors, 16psi boost, pump gas

Bincky (500.5 SAE HP) 2004 Mach 1, D1-SC Procharger, 4.15" blower pulley, custom high-flow blower inlet, 11psi peak boost, 39lb. injectors, SVT Focus fuel pump, Bassani off-road x-pipe, Magnaflow cat-back, stock motor/heads/cams/intake, pump gas














- - - - - - - - - - - - *****THE OFFICIAL TQ LIST*****

3blk98Cobra (663 SAE TQ), pump gas, 98 Cobra, 8.7:1 4.6 shortblock, ported stock 98 Cobra heads, twin 57mm HP turbo kit, SCT BA2800 MAF, MSD DIS-4, Accufab single blade TB, 72lb high imp inj, twin 255lph fuel pumps

Z06KILLR (540 SAE) 5.4 DOHC, Ford GT Heads, Crower Stage III Cams, 2000 Cobra R Intake, 14lbs boost, no intercooler.

VIPERBLUELX (540 SAE) 4.6, Ported 01 heads, stock cams, stock intake, intercooled P1SC, 72lb injectors, 17psi boost, pump gas

1BAD98 (534 SAE) 98 Cobra, Built motor, Vortech JT trim with 3.10 ultra grip pulley, Stage 2 blower cams, ported and polished heads, 55lb injectors, TKO tranny, short runner intake (ported), no IMRC plates, weldon fuel pump, long tube headers with 3 inch pipes out the back. 103 octane gas, 13-14 #'s boost

Blown01NJ (506 SAE) 01 GT w/ 2001 Cobra motor,Forged bottom end, P&P Intake, Vortech SQ (GT Impeller), 2.95 pulley, GI Joe 8-rib kit, AFM PP, Vortech mini race bypass, 60lb injectors, MD -8 fuel line upgrade,KB BAP, Wiring upgrade, Full Exhaust, 11.5's across the board 16* total timing.

SNAKBTN (499 SAE) Totally stock untouched from the oil pan to throttle body
S-trim with 2v impeller upgrade, 3.125 RR pulley 7800 rpms

VenomousSvt (480 SAE) 2001 cobra Forged shortblock Manley Pistons Manley Rods Coated bearings 9.0:1 Procharger D1-SC 12.5psi 3 core intercooler stock heads stock intake (for a few more weeks) stock cams

Blown97Cobra (463 SAE) 4.6, stock heads, stock cams, stock intake, Vortech V-1 w/ GT impellar upgrade, Snow Performance H2O Injection 55lb injectors, 16psi boost, pump gas

sc96cobra (450 SAE) 96 Cobra, forged short block 9.5.1 compression. Stock heads and Cams. Vortech V-1 upgraded impeller. 3.12 pulley with power pipe. BAS 42's injectors, 255 inline, 255 intank, AN-8 feed, AN-6 return.

JWBZSVT (449.4 SAE?) 01 Cobra, JMS built motor, stock heads & cams, vortech s/c 12 psi, intercooler/aftercooler, JMS built power pipe, Mac Lt's jet hot coated, Mac Cat-back, 42 lb injectors, 03 Cobra fuel system, 4.10's, JMS chip.

Evan5469 (430 SAE) 98 Cobra, V-1 S-trim w/ aftercooler, Forged bottom end, stock intake, stock heads, stock cams, BBK long tubes, catted BBK H, MAC catback, 77 Pro-M, about 16 psi, 93 octane

Bincky (424.1 SAE TQ) 2004 Mach 1, D1-SC Procharger, 4.15" blower pulley, custom high-flow blower inlet, 11psi peak boost, 39lb. injectors, SVT Focus fuel pump, Bassani off-road x-pipe, Magnaflow cat-back, stock motor/heads/cams/intake, pump gas
__________________
www.chattanoogastangs.com

99 Rio Red Cobra coupe w/ 04 Mach 1 longblock, LDC cooling mod, D1SC @ 8psi, ported(by me) lower intake, UPR X-pipe, FR500 catback, 03 IRS w/3.55 gear and billetflow brace, 39lb injectors, 03 Cobra fuel pumps, Diablo MAFia, custom Xcal2 tune by Lasota Racing, Steeda Tri-Ax, Spec stage I.
414rwhp/391rwtq



http://www.corral.net/forums/showthread.php?t=515518


Scott@VT Engines (600+/430 SAE) 3.7" Bore, Proprietary Stroke, Ported 05+ GT's (4valve) by Al/Cams/Sullivan Intake/Carbureted/RG. N/A HP Champion.
Boss 330 (593 SAE) 5.4L, Ported 05+ GT's (4valve) by Al/Cams/Carbureted/RG/Dry Sump.
Randy Haywood (548/439 STD*) 5.4L, Ported '00R's/Cams/Sheetmetal Intake/Carb.
Mike T. @ Modular Performance (507 SAE) 5.0L, Ported FR500/PSR/Cams/RG.
Joe Hutchins (475) 5.3L(SHM), Ported B head/Cams/Kinsler IR intake/RG.
James Lasurdo (svtsnake.com) (470/380 SAE) VT 5.3L, Ported FR500 Heads/FR500 Intake/Cams.
Nazman (459/376) 5.0L Big Bore, Owner Ported FR500's/FR500 Intake & Cams.
Shawn Johnson (454 STD*) 5.0L, Ported C Heads/Mod Perf Cams/Custom Intake/Carbureted/RG.
WMS (448 SAE) 5.3L, Ported C Head/FR500 Intake/Cams.
Paul S/PHP (430) 5.0L, Ported FR500/FR500 Intake/Cams/RG.
360NotchforUrLS1 (420/390) Ported 99/01 C head/Ported Intake/Crane Cams.
Dennis Sharp/DS97Cobra (420/330 STD*) 5.0L Ported FR500/FR500, Houston Perf Cams.
Shalom96 (410/337 SAE) 5.0L Stroker, Ported C(03) Heads/Short Runner Intake/Houston Perf Cams.
Nazman (from Mighty Mustangs) (410/333 SAE) Owner Ported FR500 Heads/FR500 Cams/FR500 Intake. 4.6L HP Champion.
01CobraSVT TICO (410/323.5 SAE) 5.0L BB/Ported 01 Heads/Hensler Spec Cams.
Mystic1/Ted S. (414/335 STD*) 5.0L, Ported 01 Heads/FR500 Intake/Mod Perf Regrinds.
Blacksnake305 (lafear01) (388/376 SAE) 5.0L BB, Fox Lake Ported 01 Heads/Joeys PI/FR500 Cam.
Ron 99 Cobra (385) 5.0L, Ported C Head/PSR.
Shawn Johnson (374 SAE) 99' .020 over cylinder bore, valve job, stock cams & intake set up for Factory Stock race class..
C Weil (372/324 SAE) 5.0L, Ported B Heads/SSR intake/FR500 Cams.
Jims SVT (370/318 SAE). JSR (jims svt) Ported Short Runner. Ported96-98 B head/Cams.
Joe Lynch (370/300 SAE) Ported C Heads/PSR Intake/Houston Perf Regrind Cams.
James Hensler (370 SAE) Ported B Head/HCI intake/Cams/RG.
ITLRUN (363.8/311.3 SAE) Bowl&Valve Work by Al on 03 heads/FR500 Intake/Stock Mach Cams.
David Simmons (car now owned by C Weil) (360/326 SAE) 5.0L, Ported B Heads/SSR intake/FR500 Cams.
vrtical (360/320 SAE) Ported 01 C Head/Aviator Intake/Crower Cams/RG.
Bob Cosby (356.2@6100/337.4@5000 SAE) 99' .020 over cylinder bore, valve job, stock cams & intake set up for Factory Stock race class.
ddmander (356/355 SAE) 5.0L/Ported C Heads/Extrude Hone Intake.
Silver01Cobra (356/348 SAE) Ported FR500 Heads/Ported Intake/FR500 Cams.
jcitroloc (353/355 SAE) 5.0L BB/Ported Intake/03 Mach C head with prep work by Boss 330.
Barry Shepard (350) Ported FR500 Heads/FR500 Intake/Cams/RG.
99BlackVenom (350/329 SAE) Ported FR500's/Extrude Hone Intake/SHM Stage2 Cams.
Duane V (346/293 SAE) Ported B Head/PI/Crower Regrind Cams/RG.
RedCobraVert (346/318 SAE) Ported C Head/Cams.
Nazman (from Mighty Mustangs) (337/337 SAE) PI, 99 C head. Bolt on HP Champion.
huzsvt (337/336 SAE) SHM stage 2 ported intake and stage 1 ported 99 C heads/Crower Cams.
4VMENACE (335/319 SAE) PSR/Ported 97 B head/SHM Cams.
ExplorerThis (from SVTPerformnce) (331.65/323 SAE) 01 C head.
tmhutch (331.6/325 SAE) PSR. 01 C head.
CYA (from SVTPerformnce) (330/320 SAE) Ported, extrude honed intake. 01 C head.
Jeff Peterson (330 SAE) PI. 01 C head.
Stedda (328/321 SAE). 01 C head.
Quick01snake (327/327 SAE). 01 C head.
Jims SVT (326/305 SAE). JSR (jims svt) Ported Short Runner. 96-98 B head.
stockmach1 (mch 1 regstry.com) (324/337 SAE) 03 C head.
4V GTS (322.4/317.9 SAE). C head.
32VHEMIJR (322 SAE) PSR. C head.
BEERFORMEPLZ (321/353! SAE) 04 Mach.
MODSTER (320). C head.
Skyler (320/319 SAE) PI by Naz. C head.
TxSnakeCharmer (320/310 SAE) Extrude Hone Intake. C head.
103 (Dustin) (320/315 STD*). C head.
RUNNINFAST (320/299) B head/ported intake/dome pistons/SHM cams.
Joe98Stang (319/309) C head.
COBRACIDE (319/316) C head.
99SVTAddict (318/315 SAE) PI. C head.
SVT CAMR (318/290 SAE) Ported Intake. 96-98 B head.
Red01 (316/321 SAE) 01 C head.






torque list
Boss 330 (520/440 STD*) 5.4L, Ported Navi/Cams/PSR/RG.
Randy Haywood[/b][/color] (548/439 STD*) 5.4L, Ported '00R's/Cams/Sheetmetal Intake/Carb/RG.
Scott@VT Engines (600+/430 SAE) 3.7" Bore, Proprietary Stroke, Ported 05+ GT's (4valve) by Al/Cams/Carbureted/RG.
Blacksnake305 (lafear01) (388/376 SAE) 5.0L, Ported Heads/Joeys PI/FR500 Cam.
ddmander (356/355) 5.0L/Ported C Heads/Extrude Hone Intake.
jcitroloc (353/355 SAE) 5.0L BB/Ported Intake/03 Mach C head with prep work by Boss 330.
BEERFORMEPLZ (321/353! SAE) 04 Mach with bolt ons.
Silver01Cobra (356/348 SAE) Ported FR500 Heads/Ported Intake/FR500 Cams.
Nazman (from Mighty Mustangs) (376/341 SAE) Owner Ported Intake/Owner Ported FR500 Heads/FR500 Cams.
Bob Cosby (356.2@6100/337.4@5000 SAE) Untouched heads/cams/intake.
Nazman (from Mighty Mustangs) (337/337 SAE) PI.
Mystic1/Ted S. (414/335 STD*) 5.0L, Ported C Heads/FR500 Intake/Mod Perf Regrinds.
99BlackVenom (350/329 SAE) Ported FR500 Head/Extrude
Dennis Sharp/DS97Cobra (420/330 STD*) 5.0L Ported FR500/FR500, Houston Perf Cams.
Quick01snake (327/327 SAE). 01 C head.
Blown46Cobra/David Simmons (360/326 SAE) 5.0L, Ported B Head/SSR intake/FR500 Cams.
tmhutch (331/325 SAE) PSR.
Stedda (328/321 SAE).
RedCobraVert (346/318) Ported C Head/Cams.
4V GTS (322.4/317.9 SAE).
COBRACIDE from Corral (318/317).
99SVTAddict (318/315 SAE) PI.
103 (Dustin) (320/315 STD*).
TxSnakeCharmer (316/308 SAE) Extrude Hone Intake.
Hone Intake/SHM Stage II Cams.
Joe Lynch (370/300 SAE) Ported C Heads/PSR Intake/Houston Perf Regrind Cams.




note: notice where my torque falls on this list.

i dont have time to read this thing and i dont think that others do to so sum it up next time lol

sorry. i wanted to have more reason behind my thinking than "just because"

those are some sick ass builds!!! god damn

Stan Weiss said:

It is cold and there was snow on the Mustang this morning so it is time to do a little bench racing. At what HP level do you need to change from 2V heads to 4V heads. Both stock and max. fully ported.
N/A
Blower / Turbo
N2O

Click to expand...

Well I noticed you said "need" .

N/A = 380RWHP
Blower= never
Turbo= 1000RWHP
N20= 600RWHP

From what iv seen, that would be my best guess. Im sure your wondering about the "never" part . The 2Vs wont be far behind the 4Vs when it comes to blower...from what I have seen you can basically make just as much power through a 2V as you can through a 4 valve.

With turbo...best iv seen through a 2V was 1000RWHP(H/C/I..the works)....iv HEARD/read of a stock 4.6 4V 03-04 cobra putting down 1000RWHP with just the addition of twin turbos and a TON of boost (obvious fuel system mods ofcourse) .
2V like teh blowers...4V like teh turbos

the highest 4v turbo is >2000hp