Modularheadshop custom 4V heads
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| Price is per pair, customer has to supply cores or we can source locally if needed. Local sourcing costs depends on castings needed. Flow gains are 20-60CFM depending on casting. 4V heads are very easy to overport, that is have higher flow numbers with the bare head than once the intake and exhaust manifolds are mounted. In cases like this the engine can actually make less power from the port work. We port to what you need and no further. All MHS 4V heads include: New custom manganese bronze guides with tighter clearance specs New custom tighter sealing Viton valve seals New brass freeze plugs Performance radius valve job CBN surfacing/decking for MLS gaskets Cam bores are micro polished Clevite assembly lube for the cams All threaded oil plugs removed and resealed Head assembly (assembly does not include cams, rockers, lifters, or exhaust studs) We offer various upgrade options for each of the heads including Timeserts brand spark plug inserts on all 8 cylinders, and also offer full head assembly. Since we hand build each set of heads to your specifications you can feel confident that you are getting exactly what is needed, nothing more and nothing less. 4V head FAQ and additional close up photos are found at the bottom of this page. |
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MHS Stage 1 Ported 4V Heads - $995 pair (Customer has to supply head castings, return freight is $10 flat rate) Bowl port and short side radius port only Stock custom reground valves Performance valve job Performance bronze valve guides Stock springs, we can custom shim if desired Options: Performance 500 lift valve springs add $350 Performance Stage 4 springs and retainers add $700 Install 32 Titanium retainers - $300 Install Timeserts for spark plugs to all 8 cylinders - $150 Install full set of stock diameter Manley beadlock SS valves - $500 Include a new set of OEM Ford exhaust studs and bolts - $75 Assemble heads/cams/rockers with rebuilt OEM lash adjusters - $400 Cam degree all 4 cams - $400 - includes TFS crank gears and parts needed for secondary chains (does not include secondary chains or tensioners) |
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MHS Stage 2 Ported 4V Heads
- $1795 pair
(Customer has to
supply head castings, return freight is $10 flat rate)
Fully ported
Stock custom reground valves
Performance valve job
Performance tapered nose bronze valve guides
Performance 500 lift springs
with higher seat pressure
Options:
Install Timeserts for spark plugs to all 8 cylinders - $150 Install Stage 4 springs and retainers - $300 Install full set of stock diameter Manley beadlock SS valves - $500 Include a new set of OEM Ford exhaust studs and bolts - $75 Assemble heads/cams/rockers with rebuilt OEM lash adjusters - $400 Cam degree all 4 cams - $400 - includes TFS crank gears and parts needed for secondary chains (does not include secondary chains or tensioners) |
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MHS Stage 3 Ported 4V Heads
- $2395 pair
(Customer has to
supply head castings, return freight is $10 flat rate)
Fully ported
Stock custom reground intake valves
1mm Manley exhaust valves
All exhaust seats
replaced with hardened oversized seats
Performance valve job
Performance tapered nose bronze valve guides
Performance 500 lift springs
with higher seat pressure
If you have 03 or newer heads
that have seen boost long term we find the exhaust seats will
need to be replaced. We created this version to not only
replace all the exhaust seats but also install 1mm oversized
Manley valves.
Options:
Install Timeserts for spark plugs to all 8 cylinders - $150 Install Stage 4 springs and retainers - $300 Install full set of stock diameter Manley beadlock SS valves - $500 Include a new set of OEM Ford exhaust studs and bolts - $75 Assemble heads/cams/rockers with rebuilt OEM lash adjusters - $400 Cam degree all 4 cams - $400 - includes TFS crank gears and parts needed for secondary chains (does not include secondary chains or tensioners) |
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MHS Stage 4 Ported 4V Heads
- $2895 pair
(Customer has to
supply head castings, return freight is $10 flat rate)
Fully ported
1mm oversized stainless
steel Manley beadlock valves
All new oversized
hardened seats,
that is all 32 of the stock powdered seats in the heads are replaced.
You cannot use an oversized valve in most of the 4V heads
without also using an oversized seat.
Performance valve job
Performance tapered nose bronze valve guides
Performance 500 lift springs
with higher seat pressure
Chromoly retainers
Timeserts in all 8 cylinders
Options:
Install Stage 4 springs - $300 Include a new set of OEM Ford exhaust studs and bolts - $75 Assemble heads/cams/rockers with rebuilt OEM lash adjusters - $400 Cam degree all 4 cams - $400 - includes TFS crank gears and parts needed for secondary chains (does not include secondary chains or tensioners) |
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Why don't you publish flow
numbers for the 4V heads?
I see shops claiming 100CFM
gains on 03-04 Cobra heads but I when I measure them on my bench
its nothing close to that especially if you mount the intake
manifold and a real world exhaust header. Rather than get
involved in that nonsense I will say we find verifiable gains of
20-60CFM depending on your casting and most of our gains are in
the 0.200" - 0.400" range which is where the power is to be
found on these heads. We do not overport to make a fluffy
raw head peak flow number.
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| How well do the stock
4V valves hold up? We have an engine that consistently runs low to mid 8 second quarter mile times on straight alcohol and a ton of boost with the stock valves. They are actually very strong and sized perfectly to the stock seats in the heads. Most of our 4V heads still have the stock valves and seats and many are in 650-900RWHP engines.
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| Why offer the Manley
valves in stock diameter? Their design flows 10-15CFM more, and the beadlock keepers are more stable at high RPM (7500 and higher)
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| When should I do
oversized intake valves like the Stage 4 heads? Only with an overbore of at least 030 or a 3.7 bore preferably. We unshroud the combustion chamber around the valves significantly for all the Stages and to really see a significant flow gain with oversized intake valves we have to go to the limit of the headgasket/bore, bigger being better here.
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| Do I need Timeserts in
my 4V heads? The 4V especially the early B heads do not blow sparks plugs as often as the Windsor 2V heads. However if it happens on a running engine it just plain sucks to repair at that point as a 4V motor is not easy to get back out of the vehicle to do the repair properly. You have to decide the risk for yourself.
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| How large of a cam lift can I fit with a 4V head? Stock valve springs and staying NA and/or boost levels below 15PSI I would use the stock cams or our Recession Buster cams only. Any higher lift performance cam and/or boost levels above 15PSI I would use the upgraded springs. |
| What if I want to run a 500 lift cam and boost at the same time? We now offer our Stage 4 spring package. Here you can run a 525 lift cam to 10000+RPM if desired. We worked quite a bit with PAC to make these springs and retainers fit the 4V heads. |
4V Head Photos
| Common problem with the 03 and newer 4V heads that are under a lot of boost. The seats get overheated and will loosen from the heads. Here you can see there is a gap between the seat and head. You can click on this video link to watch this seat break lose and spin in the head when we tried to give it a valve job. You can also click on the picture to see this up close and detailed. |
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| Stage 1 4V B head intake bowl. |
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| Stage 1 4V B head chamber side. |
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| Stage 1 4V B head intake port side. We only work the bowl region for the Stage 1 4V heads. |
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| Stage 1 4V B head exhaust port side. We only work the bowl region for the Stage 1 4V heads. |
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| Stock 4V intake bowl showing how stock guides are sized poorly. The stock guides are too short and allow a lip in the bowl at the worse possible location for flow. |
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| Installation of custom longer bronze guides. |
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| Another photo of the stock port. |
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| Final port photo with longer guides blended into roof of port. Not only does the valve have more support we fix the lip issue as well. |
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| 4V exhaust port before. |
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| 4V exhaust port after. |
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| Finished product before valve job. |
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| Stock Navigator intake bowl |
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| Ported Navigator intake bowl |
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| Stock Navigator intake |
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| Ported raised roof Navigator intake |
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| Stock Navigator exhaust |
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| Race ported Navigator exhaust |
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Copyright © 2008-2012 Modular Head Shop All Rights Reserved |
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