Level I Street Cylinder Heads

Cobra & all 32 Valve Engines

Components Part Number Price
Level I cylinder head assembilies $1845.00*
* Exchange or we will modify your heads. Rebuilding services are extra, see head machine section.


  Level I Street Cylinder Head Assemblies

  • Cost effective power upgrade
  • Lightly ported cylinder heads with Level I camshafts & valvetrain components
  • Radius seat high flow valve job & bowl blending
  • 290+ cfm intake port flow, 195+ cfm exhaust port flow
  • Assembled with valve springs shimmed for extra pressure
  • Three different Level I camshaft sets to choose from.

Level I cylinder head assemblies: $1,845.00 *
Level I Street Cylinder Heads

Cobras & all 32 Valve Engines

The 32 valve cylinder heads that Ford equipped the 4.6 & 5.4 liter engines with are the highest flowing heads that Ford has ever produced on a mass production vehicle, surpassed only by the limited heads on the Boss 429 and that not by much. Properly modified, these heads flow as much as the Yates Winston Cup heads.
TMS Level I and Level II heads use the stock valves and are designed for customers on a budget, but are still capable of producing in excess of 700 horsepower. TMS head assemblies come completely assembled and you receive the full benefit of our accumulated knowledge in all aspects of head preparation. There is a tremendous amount of development in these heads, and nothing short of that will deliver the level of power and reliability that these heads will give you. Level III to Level V heads use our stainless steel oversize valves and offer higher flows.
TMS cylinder head flow development focuses on overall port development, not just peak flow numbers. We will match our heads against all comers for their performance throughout the lift of the valve. Our heads flow more at lower lifts than what others claim at high lift. That translates to more air in the cylinder with less valve opening, and for street engines that equates to more power with less emissions

Please refer to the camshaft section for the many different selections that are available.
TMS camshafts choices allow you many levels of tune and power.
We will help you choose the best set for your power goals.

Level II Street /Racing Cylinder Heads

Cobra & all 32 Valve Engines

Components Part Number Price
Level II Cylinder Head Assemblies with Stock Valve Springs $2759.95*
Level II Cylinder Head Assemblies with high rpm valve spring package $3359.95*
Combustion chamber
contouring and polishing		 $274.95

Cylinder Head Machining
&
Rebuilding Services

Install manganese
bronze valve guides 		$265.95
Surface heads $64.95/pr
Install new valves
and valve guides		 $619.95
Pressure test $47.95/pr
Install new valve seats $355.95
Repair cam bearing bores Call
Machine heads for SS
O- rings 		$199.95
Radius seat valve job $189.95

*Exchange or we will rebuild your heads. Rebuilding services are extra, see above.

Level II Street/Racing Cylinder Head Assemblies
  • Ported intake and exhaust with port flows as above.
  • Radius flow intake and exhaust seats
  • Level II camshaft kits installed with stock or high rpm spring package
  • Three different Level II camshaft kits available for street to medium race level performance

Level II Cylinder Head Assemblies with Stock Valve Springs : $2759.95*

Level II Cylinder Head Assemblies with high rpm valve spring package : $3359.95*

Combustion chamber contouring and polishing; $ 274.95

*Exchange or we will rebuild your heads. Rebuilding services are extra, see above.

Level II Street/ Racing Cylinder Heads

Cobras & All 32 Valve Engines

TMS Level II cylinder head assemblies are the beginning of serious power output for your 4.6 or 5.4 based 32 valve Ford engine. These heads will deliver strong street up to race level performance. Our advanced porting programs combined with state of the art camshaft profiles deliver. This is a true cylinder head package, TMS heads come complete with camshafts and all valvetrain components, ready to bolt on to your shortblock. Indexed cam gears allow the choice of many timing settings that substantially change the power delivery of the engine.
When comparing cylinder heads and porting, airflow numbers are king. In order to make a fair comparison to the popular Extrude Hone heads, we tested a pair that came from a customer to compare to our stock valve Level II heads. The E.H. heads were given our specially developed radius seat valve job, exactly the same as the TMS heads tested. The TMS heads were the winners, and flowed more on average than the E.H. heads throughout the lift range. Here are the results:

Exhaust Flow Intake Flow

TMS Heads
Exhaust flow 202 cfm
Intake flow 306 cfm

E.H. Heads
Exhaust flow 190 cfm
Intake flow 296 cfm

All flows @ .525" lift
Those are the real numbers and again, our cylinder heads outflow our competitors.

Level III  & IV
Street /Competition
Cylinder Heads
Stainless Steel Big Valve
Cobra & all 32 Valve Engines

Components Part Number Price
Level III Cylinder Head Assemblies $4299.95*
Level IV Cylinder Head Assemblies $4899.95*


Level III
Cylinder Head Assemblies

Level III heads are well ported stainless valve cylinder head assemblies that provide excellent street or racing performance at an affordable cost You receive ready to run heads with the correct geometries and dimensions.

  • Stainless steel oversize racing valves installed and valve guides honed to fit
  • Oversize valve seats installed with our special radius seat valve job, blended to port
  • Intake ports modified to yield flows of 320+ CFM
  • Exhaust ports modified to yield flows of 230+ cfm
  • Combustion chambers polished
  • Assembled with Level III camshafts and high rpm spring/valvetrain package
  • Level III camshafts give you the choice between mild street up to race performance cams

Level III Cylinder Head Assemblies
$4299.95*

 

Level IV
Cylinder Head Assemblies

Level IV heads are fully ported stainless valve cylinder head assemblies that provide full competition or max Pro Street type performance. We used Level IV heads on our 838 hp engine and are very confident of their ability to make over 1000 hp super/turbocharged and 500+hp naturally aspirated. We have achieved a favorable intake to exhaust port flow ratio of 78 %, considered to be optimal for maximum power production. The exhaust ports on the Level IV heads require a header primary pipe size of at least 1 7/8" for proper flow.

  • Stainless steel oversized racing valves installed and valve guides honed to fit
  • Oversize valve seats installed with our special radius seat valve job, blended to port
  • Intake port fully contoured to yield flows of 335+ cfm
  • Exhaust port fully contoured to yield flows of 262+ cfm
  • Contoured and polished combustion chambers for improved combustion and port flow
  • Assembled with Level IV camshafts and high rpm spring/valvetrain package
  • Level IV camshafts give you the choice between radical street to full competition performance

Level IV Cylinder Head Assemblies
$4899.95*

LEVEL III & IV Stainless Steel Big Valve Cylinder Heads

Street & Competition
for Cobra & All 32 Valve Engines

TMS heads are proven in dyno testing and racing to be the most powerful cylinder heads available for your 4.6 & 5.4 modular cammer. TMS heads are so good because of years of development and very unique valve, valve seat and port configurations that yield very high flow levels. Not only high flows, but outstanding low and mid lift flows that fill the cylinders with air earlier and better than our competitors. Please refer to the airflow tables and compare our flow numbers. Depending upon the power level of your engine, expect between 40 and 125 hp increases for your engine with the proper combination.

 

Our Air Flow Results

When comparing cylinder heads and porting, airflow numbers are king. In order to make a fair comparison to the popular Extrude Hone heads, we tested a pair that came from a customer to compare to our stock valve Level II heads. The E.H. heads were given our specially developed radius seat valve job, exactly the same as the TMS heads tested. The TMS heads were the winners, and flowed more on average than the E.H. heads throughout the lift range. Here are the results:

Exhaust Flow Intake Flow

TMS Heads
Exhaust flow 202 cfm
Intake flow 306 cfm

E.H. Heads
Exhaust flow 190 cfm
Intake flow 296 cfm

All flows @ .525" lift
Those are the real numbers and again, our cylinder heads outflow our competitors.

Level V
Full Competition Cylinder Heads
Stainless Steel Big Valve
with Billet Camshafts
Cobra & all 32 Valve Engines

Components Part Number Price
Level V
cylinder heads*		 Call

Cylinder Head Machining
&
Rebuilding Services

Install manganese
bronze valve guides 		$265.95
Surface heads $64.95/pr
Pressure test
Heads		 $47.95/pr
Modify Camshaft
journal oiling		 Call
Repair/buch cam
bearing bores 		Call
Machine heads for SS
O- rings 		$199.95

*Exchange or we will modify your heads  
Titanium valve spring retainers :
Add $175.95 to complete heads
Premium quality Indy car racing springs :
Add $221.95

Level V Stainless Steel Big Valve Cylinder Heads

Full Competition with Billet Camshafts for all 32 Valve Racing Engines

Level V cylinder heads are currently under development for our full comp customers. That extra level of prep that goes into making the last bit of power and the use of even higher lift billet cams are what separate these heads from the excellent Level IV heads. Special roller rocker arms, springs, and other valvetrain components are custom built for the Level V head. Please call if you are serious about the best.