Performance LX9 3500 Cylinder Heads

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Product Information

New for 2022.  Refreshing our products to represent WOT-Tech at its best.  First the specs, then some details.

Stage 1

  • Cleaned, baked, blasted before full inspection and pressure testing is done.
  • Stage 1 Porting
  • Milled deck to MLS RA compatible spec
  • Milled exhaust side to improve gasket seal
  • Bronze Guide Liners
  • New Valves (nitrided)
  • Valve Job
  • Hardened Steel Seats / Viton Seals
  • Hardened Machined Steel Retainers and Keepers
  • Cam Matched Valve Springs

Stage 2

Same as Stage 1 but with the valves swapped out and matching port work to go with them.

  • Performance 1.800"/1.425" Stainless Valves
  • Stage 2 Porting
  • Race Valve Job
  • Combustion Chamber Deshrouding

Stage 3

Same as above but with a larger exhaust valve for boosted applications, the new exhaust seat to allow for this.  Increased port volume for high boost setups.

  • Performance 1.800"/1.520" Stainless Valves
  • Stage 3 Porting
  • New Exhaust Seats
  • Race Valve Job
  • Combustion Chamber Deshrouding


  • Time Sert for Rockers
  • Time Sert 8mm to 10mm 
  • Machine Spring Pockets for Race Springs


Recommendations and explanations

Why Bronze Liners?

All of our signature series heads have the guides redone with bronze liners.  This is the preferred method of bringing the guides back to spec (or better in this case), with a tighter tolerance in sizing and variance top to bottom, side to side.  Keeping the valve running true helps the valve seal, as well as overall valvetrain stability.  Less oil to get past the valves and less friction gives better power and durability.  Perfectly straight guides also mean the world when it comes to the valve job.  Tighter concentricty of the seat means less valve flex to seat, reducing fatigue and improving the seal between the valve and cylinder head.  

What is MLS RA Spec?

RA is the average peak and valley measurements to give a measurement of how smooth an object is.  MLS is Mult Layer Steel, such as the Cometic head gaskets we sell for for performance and extreme applcations.  All this means is our heads are machined to a surface finish that works well with these types of gaskets, or any other type you wish to use.

Send the heads, or have us source them.

There is no core system for you to send us a set of heads back after get a set.  What you send is what you will get back.  If we end up having heads done and on a shelf at some point, this might change but as of this writing.

Time Serts.

All of the LX9 3500 heads have 8mm rocker arm threads.  Sometimes these get stripped out when installing the rockers, or later on the rockers pull out of the head.  Its not a high enough percentage of this happening to make this a mandatory upgrade, but is one recommended for those that don't want any concern of them stripping out.  10mm option is for those that either want to use the 10mm rockers found on 2002 and older 3100/3400 engines, or experiment with the aluminum rockers that use a 10mm stud.  

Machine Spring Pockets.

Increasing the install height of the springs from 1.700" to 1.760" makes the stiffer spring option viable for use with one of our race cams or similar.  Price includes the matching race springs to match our race cams.  

Which stage do I use?

Stage 1 and 2 come down to budget and application.  If this is a build for fun, stage 1.  If this is a build to compete or the cost difference doesn't make you flinch stage 2.  Stage 3 is for high boost applications that need to flow as much as possible.  

This listing is a work in progress.  Feel free to contact for more info regarding our cylinder head options.  


Product CodeG3LX9PCH

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