The Mustang Collective Forums

The Mustang Collective Forums (
-   NewEdge 4.6L Tech (
-   -   Anyone know anything about the SVO doesn't seem to. (

05 StangGuy 03-29-2014 11:42 PM

Anyone know anything about the SVO doesn't seem to.
I just did my PI swap a while ago, when someone offered me the apparently rare SVO intake.

Now I don't know if I'd spring for it...mainly because I can't find any hard info on it. So I'm hoping someone here will have some.

Just curious if aside from rarity, if it's worth $400 for the whole install set.

RedfirePony 04-05-2014 10:36 AM

The SVO intake and cylinder heads are no longer in production and no longer appear n the Ford Racing Catalog. The heads and intake were released in 1998 and were to be used on the poor breathing non- PI '96 thru '98 2 valve 4.6. The intake was a long runner intake made of cast aluminum rather than the composite material of the production 4.6. It utilized a two throat throttle body and closely resembles the cast aluminum intake used on the 2001 Bullitt Mustang. THE SVO INTAKE WILL NOT WORK WITH THE PI HEADS USED ON THE '99 THRU '04 MUSTANG DUE TO AN INTAKE PORT MISMATCH.

The SVO heads are best flowing production 2-valve head with better flow numbers than the PI heads. Again these heads are no longer available. The non PI heads had the valves moved to the outer extreme of the combustion chambers creating shrouding by the cylinder walls when the valves were opened. There was also a small finger like wall cast into the combustion chamber surrounding the intake valve to induce swirl. This was further reduced intake flow. The non PI heads flowed poorly both on the exhaust and intake side.

The SVO heads moved both valves closer to the center of the combustion chamber and the wall in front of the intake valve was removed to un-shround the valves and increase flow. Both valves in the SVO heads were larger than in the Non PI head. Intakes were 46.83 mm and the exhaust were 35.88. The combustion chamber size was 51 CC non PI, 42 CC PI, and 53 CC SVO.

The SVO head out flowed both the non PI and PI heads at all levels of valve lift. Intake valve lift at .05" lift was 25 cfm non PI; 25 cfm PI and 27 cfm SVO. Flow at .600" was 166 cfm non PI; 160 cfm PI; and 206 cfm SVO

The exhaust flow numbers at .05" were 22 cfm non PI; 24 cfm PI and 23 cfm SVO . Flow at .600" was 117 cfm non PI; 138 cfm PI; and 143 CFM SVO.

The Trick Flow 2-valve heads flow much better than the SVO head, but the SVO heads were the best available until the advent of aftermarket heads. FYI the flow numbers for the Trick Flow Twisted Wedge heads for the 4.6 2 valve are 252 cfm intake and 188 cfm exhaust at .600" lift. (figures from Trick Flow's website).

The information about the SVO intake and heads comes from Sean Hyland's book "How to Build Max Performance 4.6 Liter Ford Engines". ISBN 1-884089-78-X from Car Tech Books.

Here is a link to Trick Flow's website and their intake manifold that resembles the SVO and Bullitt intakes.

Downtime! 04-05-2014 07:04 PM

I remember that as a good alternative at the time, but there are better things now. Look at Fox Lake, and their P51 intake. It's not cheap, at $800, but it is the best intake for a 2V car. They used to make their own heads too, but it looks like they've moved over to selling Trick Flows now.

2V's used to get a bad rap in the Mustang world, but there are parts out there now that give you a good solid runner, and make the kind of power we used to think only 4V's could attain.

All times are GMT -5. The time now is 08:03 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Shoutbox provided by vBShout v6.2.1 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.