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 radius valve job Performance bronze valve guides Stock springs, we can custom shim if desired Turnaround time is typically 3~4 weeks Options: Performance 500 lift valve springs add $350 Install 32 Titanium retainers - $300 Install Timeserts for spark plugs to all 8 cylinders - $150 Include a new set of OEM Ford exhaust studs and bolts - $75 Assemble heads/cams/rockers with rebuilt OEM lash adjusters - $400 |
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MHS Stage 2 Ported 4V Heads
- $1695 pair
(Customer has to
supply head castings, return freight is $10 flat rate)
Fully ported
Stock custom reground valves
Performance radius valve job
Performance tapered nose bronze valve guides
Performance 500 lift springs
with higher seat pressure
Turnaround time is typically 3~4 weeks
Options:
Install Timeserts for spark plugs to all 8 cylinders - $150 Install 32 Titanium retainers - $300 Include a new set of OEM Ford exhaust studs and bolts - $75 Assemble heads/cams/rockers with rebuilt OEM lash adjusters - $400 |
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MHS Stage 3 Ported 4V Heads
- $2695 pair
(Customer has to
supply head castings, return freight is $10 flat rate)
Fully ported
0.5 or 1mm oversized stainless
steel valves (your choice)
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 radius valve job
Performance tapered nose bronze valve guides
Performance 500 lift springs
with higher seat pressure
Timeserts in all 8 cylinders
Turnaround time is typically 3~4 weeks
Options:
Install 32 Titanium retainers - $300 Include a new set of OEM Ford exhaust studs and bolts - $75 Assemble heads/cams/rockers with rebuilt OEM lash adjusters - $400 |
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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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| Why do you do a radius
valve job instead of a multi-angle like a 5 angle valve job to the
4V heads? A radius job is 2 angles plus a radius shape leading from the valve seat is cut into the bowl. This gives higher flow numbers in the 0.200"- 0.500" valve lift ranges which is where 99% of 4V cams are operating. Above 0.500" lift the multi-angle flow more but very few of you are using cam lifts higher than 0.500"
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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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| 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 only. Any performance cam and/or boost levels above 15PSI I would use the upgraded springs. Once you have upgraded springs I would recommend: 500 lift cams for most street strip NA - you will need to clearance the cam towers for this lift 475 lift cams for 7500-8500 shift points NA as we need to shim the springs some 450 lift cams for 7000-8500 shift points boosted as we need to shim the springs even more |
| What if I want to run a 500 lift cam and boost at the same time? The valve spring and retainer package will get expensive. Plan on another $600 on top of the Stage 2 or Stage 3 price for a 500 lift capable package to handle up to about 8000RPM boosted and another $1000-$1200 for a custom dual spring package to handle 8000+RPM boosted. Going to the dual spring package we also need to run a custom beadlock valve stem and that will add additional costs as well. |
4V Head Photos
| 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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