Modularheadshop custom NPI heads
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| Stage 1 - $995 pair Stage 2 - $1395 pair | Port job, bronze guides Upgraded 0.5mm SS valves, valve springs, and tapered nose valve guides added |
| Price is per pair, the core charge is included, these prices are outright. You can save $100 by sending your heads. All MHS NPI heads include: New custom manganese bronze guides with tighter clearance specs New custom tighter sealing Viton valve seals New brass freeze plugs Performance 4 angle 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 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. Heads are seasoned and inspected Romeo or Windsor cores depending on your needs. NPI head FAQ and additional close up photos are found at the bottom of this page. |
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MHS Stage 1 Ported NPI Heads - $995 pair We take stock seasoned NPI head cores, port to our Stage 2 specs, and install our custom manganese bronze guides with ultra tight valve stem to guide clearances to improve both oil control and allow an improved performance valve job to be done. The stock head has double to triple the valve guide clearance and thus you have to make the valve job much lower performing. To keep the budget down we reuse the stock valves and springs with the Stage 1 head. We then go from the stock 2 angle valve job to a performance 4 angle which includes tightening of some of the angles and widening of the others to enhance the flow. includes freight to any dress in lower 48 states! Options: Include any set of Bullet 2V Cams with heads - $550 Include a new set of OEM Ford exhaust studs and bolts - $75 Assemble heads/cams/rockers with rebuilt OEM lash adjusters - $200 |
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MHS Stage 2 Ported NPI Heads - $1395 pair We take stock seasoned NPI head cores, port to our Stage 2 specs, and install our custom tapered nose manganese bronze guides with ultra tight valve stem to guide clearances to improve both oil control and allow an improved performance valve job to be done. The stock head has double to triple the valve guide clearance and thus you have to make the valve job much lower performing. 0.5mm oversized custom stainless steel valves are used to increase the flow. We then go from the stock 2 angle valve job to a performance 4 angle which includes tightening of some of the angles and widening of the others to enhance the flow. Options: Include any set of Bullet 2V Cams with heads - $550 Include a new set of OEM Ford exhaust studs and bolts - $75 Assemble heads/cams/rockers with rebuilt OEM lash adjusters - $200 |
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There are some advantages to a NPI head,
and some situations where it is a better choice.
The primary advantage is the stock valves and springs will work with a much larger duration cam than the PI head. This head is also a good choice for original NPI shortblocks that need a better flowing head AND also have a supercharger since swapping a PI head makes the compression too high. NPI heads have extremely high velocity intake ports, you get the same good flow with an intake port about 1/3 smaller than a PI. The original problem with the NPI not making good power was learned to be its poor intake manifold and camshafts. Swapping a PI intake is easy and we have cams that work good with them as well. Stock springs will work to 7000RPM N/A with our cams. |
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