4V heads Vs 3V heads, and noob Q.

TheUNZippee! · February 4th, 2008, 05:43 PM

I have a question, part of which may be ridiculous, but if you don't know, you don't know, so I'm asking.

First off, how much more do the 4v heads flow than the 3v heads, and what power gains can be realized as a result of this, both with N/A & F/I applications.

Also, would any 4v heads fit on my 3v S197 block? Or is it a completely different animal?

I gotta stop hanging out in this section....I can see me becoming addicted real quick....

Goblin · February 4th, 2008, 05:47 PM

Hey, nothing wrong with hangin out in this section!! Its good for your health, and bad for your wallet!

All 4.6 mod blocks are interchangable when it comes to heads. The 3v heads flow very well, but are down by about 30% compared to the C 4v heads. I dont have exact CFM comparisons, but the 4v heads will make a considerable amount of more power over the 3v's in both N/A and FI configurations.

BWAL09 · February 4th, 2008, 05:47 PM

some people will actually tell you that the 3v heads flow better than the 4v heads

Goblin · February 4th, 2008, 05:49 PM

Originally Posted by BWAL09

some people will actually tell you that the 3v heads flow better than the 4v heads

Those same people need to step away from the crack pipe.

BWAL09 · February 4th, 2008, 05:50 PM

^ lol

03 R Code · February 4th, 2008, 06:21 PM

Mach 1 Registry Owners Club - 4.6 & 5.4 head flow numbers - Powered by PhotoPost

That link has a chart comparing 2v and 4v heads... Lemme look a little longer to see if I can find anything on 3v heads.

TheUNZippee! · February 4th, 2008, 06:23 PM

Thanks dude, you rock

TheUNZippee! · February 4th, 2008, 06:24 PM

And thanks, Goblin.

This is making me think of future possibilities down the road.

03 R Code · February 4th, 2008, 06:28 PM

Couldn't find any #'s on 3v heads that haven't already been ported. Maybe someone else feels like looking harder than me...

StangAddiction · February 4th, 2008, 06:29 PM

The 3 valve heads are capable of good Naturally aspirated power though...Full bolt-ons and good cams and the 3 valve can easily make 350 rwhp.. That's without ported heads..

Goblin · February 4th, 2008, 06:41 PM

I cant seem to find stock flow #'s either.

I can tell you though, the 4v heads DO flow better than the 3v's. That i know is fact. Just wish i could find some numbers, even for myself.

TheUNZippee! · February 4th, 2008, 06:45 PM

Thanks guys.

Wow, amazing difference in flow between the 2v and 4v heads. (obviously lol), at even say, .400" lift.

Be interesting to find what the 3v heads do.

whitemustang02 · February 4th, 2008, 07:20 PM

ok, im shure this is a dumb newb question from a sixer.
but what kind of heads were used on the mack 1, the same as the '03 cobra or somthing diferent.

Goblin · February 4th, 2008, 07:41 PM

The 03/04 Mach 1's share the same heads and valvetrain as the 03/04 Cobras.

whitemustang02 · February 4th, 2008, 07:45 PM

ok cool thanks, wasent shure if ford changed somthing up on the heads for the cobras for the blower.

Doc8224 · February 4th, 2008, 08:41 PM

Do it zip. Get a set of P&P'd 4v heads and some nice rough cams.

06RedfireGT · February 4th, 2008, 08:42 PM

Zip, IMO the 4V heads don't improve enough over the 3V heads to warrant a swap. It would be hard, plus the performance improvment wouldn't be all that much, because the 3V heads do flow really good.

TheUNZippee! · February 4th, 2008, 08:58 PM

Originally Posted by Doc8224

Do it zip. Get a set of P&P'd 4v heads and some nice rough cams.

Dude, this is what I'm thinking.

Originally Posted by 06RedfireGT

Zip, IMO the 4V heads don't improve enough over the 3V heads to warrant a swap. It would be hard, plus the performance improvment wouldn't be all that much, because the 3V heads do flow really good.

Well I would like to see some numbers first. If the 4v's come even close to the flow differential they have over even the 2v svo heads, I think it would make a difference, especially once you went FI.

Not to mention the cool factor of having a 4v head upgrade on my S197

lol

Mustang RacR94 · February 4th, 2008, 09:02 PM

4v heads, MMFF did a flow test at some point i beleive, but thats a magazine, trust that if you want

Goblin · February 5th, 2008, 03:17 PM

Originally Posted by 06RedfireGT

Zip, IMO the 4V heads don't improve enough over the 3V heads to warrant a swap. It would be hard, plus the performance improvment wouldn't be all that much, because the 3V heads do flow really good.

See, this i agree with. Only until you get into forced induction though, then the 4v heads will come out on top.

February 4th, 2008, 05:47 PM	#2
Goblin Hardcore Enthusiast 88mm Join Date: Apr 2007 Location: Tucson, AZ Posts: 2,051	Hey, nothing wrong with hangin out in this section!! Its good for your health, and bad for your wallet! All 4.6 mod blocks are interchangable when it comes to heads. The 3v heads flow very well, but are down by about 30% compared to the C 4v heads. I dont have exact CFM comparisons, but the 4v heads will make a considerable amount of more power over the 3v's in both N/A and FI configurations. __________________ Definition of Fast? I'd say thats good enough. NMRA Outlaw 10.5 Season Opener 2008 Photo courtesy of - Yours Truly

February 4th, 2008, 05:47 PM	#3
BWAL09 Any hole is my goal! 2021 Mustang V12 Quad Turbo with nawz Join Date: Nov 2006 Location: modified88dreamer likes penis in and around his mouth Posts: 9,962	some people will actually tell you that the 3v heads flow better than the 4v heads __________________ 1989 LX 5.0 1990 LX 5.0 1993 LX 2.3 notch 1992 LX 5.0 1997 Cobra Buy one get one free. PM me i founded the founder of the cobra club

February 4th, 2008, 05:50 PM	#5
BWAL09 Any hole is my goal! 2021 Mustang V12 Quad Turbo with nawz Join Date: Nov 2006 Location: modified88dreamer likes penis in and around his mouth Posts: 9,962	^ lol __________________ 1989 LX 5.0 1990 LX 5.0 1993 LX 2.3 notch 1992 LX 5.0 1997 Cobra Buy one get one free. PM me i founded the founder of the cobra club

February 4th, 2008, 06:21 PM	#6
03 R Code Hardcore Enthusiast unstoppable @ speed of light Join Date: Jul 2006 Location: Knees deep in dat ass Posts: 2,941	Mach 1 Registry Owners Club - 4.6 & 5.4 head flow numbers - Powered by PhotoPost That link has a chart comparing 2v and 4v heads... Lemme look a little longer to see if I can find anything on 3v heads. __________________ Political correctness is a doctrine fostered by a delusional, illogical, liberal minority, and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end.

February 4th, 2008, 06:28 PM	#9
03 R Code Hardcore Enthusiast unstoppable @ speed of light Join Date: Jul 2006 Location: Knees deep in dat ass Posts: 2,941	Couldn't find any #'s on 3v heads that haven't already been ported. Maybe someone else feels like looking harder than me... __________________ Political correctness is a doctrine fostered by a delusional, illogical, liberal minority, and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end.

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February 4th, 2008, 06:29 PM	#10
StangAddiction Enthusiast 2000 Mustang GT Join Date: Jan 2007 Location: Virginia Beach Posts: 974	The 3 valve heads are capable of good Naturally aspirated power though...Full bolt-ons and good cams and the 3 valve can easily make 350 rwhp.. That's without ported heads..

February 4th, 2008, 06:41 PM	#11
Goblin Hardcore Enthusiast 88mm Join Date: Apr 2007 Location: Tucson, AZ Posts: 2,051	I cant seem to find stock flow #'s either. I can tell you though, the 4v heads DO flow better than the 3v's. That i know is fact. Just wish i could find some numbers, even for myself. __________________ Definition of Fast? I'd say thats good enough. NMRA Outlaw 10.5 Season Opener 2008 Photo courtesy of - Yours Truly

February 4th, 2008, 07:20 PM	#13
whitemustang02 MM's official Chevy guy 2002 Mustang V6 Join Date: Sep 2007 Location: Rochester, NY Posts: 1,993	ok, im shure this is a dumb newb question from a sixer. but what kind of heads were used on the mack 1, the same as the '03 cobra or somthing diferent. __________________ "Speak softly and carry a big stick" - Theodore Roosevelt "Any idiot can make a V8 fast, it takes a real idiot to make a fast V6". '02 Mustang N/A 4.3 stroker away for winter '72 Chevelle project car 454 coming '93 Bronco EFI 351W DD

February 4th, 2008, 07:41 PM	#14
Goblin Hardcore Enthusiast 88mm Join Date: Apr 2007 Location: Tucson, AZ Posts: 2,051	The 03/04 Mach 1's share the same heads and valvetrain as the 03/04 Cobras. __________________ Definition of Fast? I'd say thats good enough. NMRA Outlaw 10.5 Season Opener 2008 Photo courtesy of - Yours Truly

February 4th, 2008, 07:45 PM	#15
whitemustang02 MM's official Chevy guy 2002 Mustang V6 Join Date: Sep 2007 Location: Rochester, NY Posts: 1,993	ok cool thanks, wasent shure if ford changed somthing up on the heads for the cobras for the blower. __________________ "Speak softly and carry a big stick" - Theodore Roosevelt "Any idiot can make a V8 fast, it takes a real idiot to make a fast V6". '02 Mustang N/A 4.3 stroker away for winter '72 Chevelle project car 454 coming '93 Bronco EFI 351W DD

February 4th, 2008, 08:41 PM	#16
Doc8224 N/A 4v Guru 2003 Mach 1 Join Date: Oct 2007 Location: Ft. Hood,TX Posts: 3,257	Do it zip. Get a set of P&P'd 4v heads and some nice rough cams. __________________ U.S. Army Aviation Apache's Lead The Way

February 4th, 2008, 09:02 PM	#19
Mustang RacR94 Hardcore Enthusiast 03 mach 1 13.2@109 Join Date: Dec 2006 Location: Mooretownship,PA kinda close to allentown Posts: 2,987	4v heads, MMFF did a flow test at some point i beleive, but thats a magazine, trust that if you want __________________ 2003 Mach 1, 5 speed "Dont worry ive locked horns with this fucker before"- TasteMyThunder "More like my gameplay will break there will"-TasteMyThunder www.myspace.com/mustangracr94

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