[FknBadFkr]

Hey i was wondering if there are 3 aluminum heads avalible from Esslinger now?..I know they had the ARCA head and the New NASH head but is the SVO head differant from the ARCA?..i know the SVo used to advertise with 1.89 and 1.59 valves,and i see the ARCA says 2.02 and 1.60 valves?..did they revise the SVO to flow more or is it the same head with bigger valves?..........i figured id let you all laugh at me before i Email Esslinger..........Hal

[pyropete125]

i *think* the svo and the ARCA head are basically the same casting just the ARCA head is CNC ported to the max and with larger valves...

[TurboRay]

Esslinger actually makes 4 different aluminum heads for the 2.3-based motors:

1. SVO (the original)
   
2. ARCA (SVO casting, but CNC machined with larger ports, as pyropete125 said)
   
3. Midget (different casting with 5 cam towers)
   
4. Street/D-port (stock replacement head that accepts the factory intake and has provisions for mounting all the OEM accessory brkts)
   

C'ya - RAY

[ATOMonkey]

So the SVO doesn't have accessory bolt holes?

[FknBadFkr]

thanx for the info..I totaly forgot about the 5 cam tower head and i have an article about it right here............Hal

[Turbopit]

Info from JoeM:

1) The "SVO" head. The original head they made with the slightly raised (.375") stock=type exhaust port layout and 1.89/1.59 valves...appx. 255-260 intake flow. Will work with OE bore (~3.800") 4-tower head, solid cam. Round, raised intake ports. Sold bare, cleaned-up "as cast" ports -- ~1200-1300 bucks. Requires slight machining of cam for oiling (groove on front and rear journals).
I made 528 HP at the wheels (Dynojet) with this head, with less than 30 PSI.
2) "ARCA" (truck series) head. Square exhaust pattern, raised a little more than on the SVO head. Similar intake, raised slightly more(.180")., 2.00/1.60 valves, appx 290-300 intake flow, 4-tower, solid cam. Requires slight machining of cam for oiling (groove on front and rear journals).Will work on OE bore, as with SVO head. ONLY SOLD COMPLETE, including cam and all valvetrain, comes CNC ported...$3500
This head is BAD ASS...it's what I have on the Focus and it put down ~700 horse to the ground (2600# and 151 mph)
4) "Midget" head. Similar to (2), but with 2.10/1.55 titanium valves, WILL NOT work with OE bore sizes, needs 3.850 or bigger, 5-tower, CNC-ported, solid cam. Current midget variants (tough game, they're always tweaking them...) flow in the 340-350 range.
A NA 2.5L Esslinger midget crate motor makes 360+ HP at 9K and will run at WOT for 20+ lap race...and last 2 years before "freshening". They are only sold complete (dynoed and bolt-in to a midget) for appx. 20-something grand.
4) "Street" head. Similar to the SVO head, but with OE D-port intake layout, provisions for full cam oiling (no machining) and hydraulic lifters, 1.89/1.59 valves. "As-cast" ports (cleaned up. of course). All accessory holes drilled and tapped, bolt-on. $1500 complete.
All 4 heads have the same combustion chamber design...which Dan is pretty proud of I guess...it's pretty different from stock, kindof a "closed" design but no shrouding on the valves whatsoever. I don't really know how to describe it, but it's pretty cool. All take all stock valvecovers and gaskets

[GreenTurbo]

Originally posted by TurboRay:
Esslinger actually makes 4 different aluminum heads for the 2.3-based motors:

1. SVO (the original)
   
2. ARCA (SVO casting, but CNC machined with larger ports, as pyropete125 said)
   
3. Midget (different casting with 5 cam towers)
   
4. NASH (stock replacement head with provisions for mounting all factory accessory brkts)
   

C'ya - RAY

I thought the nash flowed like a ported out iron head?

[Joe Morgan]

Originally posted by GreenTurbo:
</font><blockquote><font size="1" face="Verdana, Arial">quote:</font><hr /><font size="2" face="Verdana, Arial">Originally posted by TurboRay:
<strong> Esslinger actually makes 4 different aluminum heads for the 2.3-based motors:

1. SVO (the original)
   
2. ARCA (SVO casting, but CNC machined with larger ports, as pyropete125 said)
   
3. Midget (different casting with 5 cam towers)
   
4. NASH (stock replacement head with provisions for mounting all factory accessory brkts)
   

C'ya - RAY

I thought the nash flowed like a ported out iron head? </strong></font><hr /></blockquote><font size="2" face="Verdana, Arial">The D-port (not gonna call it "N***") flows significantly more than any ported iron head, and near what an SVO head does.

BTW -- an SVO and an ARCA are different castings.

[GreenTurbo]

Originally posted by Joe Morgan:
</font><blockquote><font size="1" face="Verdana, Arial">quote:</font><hr /><font size="2" face="Verdana, Arial">Originally posted by GreenTurbo:
<strong> </font><blockquote><font size="1" face="Verdana, Arial">quote:</font><hr /><font size="2" face="Verdana, Arial">Originally posted by TurboRay:
<strong> Esslinger actually makes 4 different aluminum heads for the 2.3-based motors:

1. SVO (the original)
   
2. ARCA (SVO casting, but CNC machined with larger ports, as pyropete125 said)
   
3. Midget (different casting with 5 cam towers)
   
4. NASH (stock replacement head with provisions for mounting all factory accessory brkts)
   

C'ya - RAY

I thought the nash flowed like a ported out iron head? </strong></font><hr /></blockquote><font size="2" face="Verdana, Arial">The D-port (not gonna call it "N***") flows significantly more than any ported iron head, and near what an SVO head does.

BTW -- an SVO and an ARCA are different castings. </strong></font><hr /></blockquote><font size="2" face="Verdana, Arial">and the "D port head" still room to port out?

[Joe Morgan]

As far as I know, nobody has ever really ported one...LOL

They do what you might refer to as "assembly line" cleanup behind the valves, to blend the casting to the machined seats...and it flows 238 at 28"...out of the box. Maybe that's all it's gonna get, but it would be the first head ever that couldn't be improved.

I don't care what some of the wanna-bee head-hackers on here say, you ain't gonna get near this head with an iron casting, the port has been moved out to where there's only H2O in an iron head.