M2 Alloy Steel, 2.250" x 1.937" x .187"

Valve Seat Inserts, purchase quantity 1 for a set of eight seats.

Common Applications:

• FE Ford w/ 2.090" Intake valves
  
• BB Ford 429, 460 w/ 2.083" Intake valves.
• Big Block Chevy, 396, 402, 427 & 454 which have 2.070" intake valves. (most oval port heads)
• BB Chrysler, 361, 383, 400, 413, 426 Wedge, 440 w/ 2.078" intake valves.
• Oldsmobile, 425, 66-67 Tornado w/ 2.063" Intake valves.
• Oldsmobile 400, 66-67 w/ 4 Bbl carb, w/ 2.063" Intake valves
• Or Universal for engines in need to shallow depth seat for the intake position, use w/ intake valve diameters between 2.050"-2.125"

 
These are from Precision Engine Parts.

Part Number: M2-2250-1

M2 Alloyed Seats are an excellent choice for converting older heads to run unleaded fuel and for medium to heavy duty engines.

M2 seats machine easily on modern seat and guide machines or ground using stones. (Sioux, Kwik way, etc)

     Sizes:

• Outside Diameter: 2.250" Plus Press
  
• Inside Diameter: 1.937"
• Depth" .187"
• Radiused leading edge for ease of installation
• Suggested press fit for iron head- .0045" - .0060"
  

     Material:

• M2 Alloy contains: Carbon, Silicon, Manganese, Chrome, Molybdenum, Nickel, Vanadium and Tungsten
• Can be Machined w/ carbide or Ground w/ stones
  

Tech Notes-
  

1.  Intake seats do not need to be changed to run unleaded fuel, only exhaust
2.     Iron heads which came from the factory with seats usually require special size replacement seats.
3.     Aluminum heads also use special size seats. Their depth is usually much deeper then unleaded retro fit seats.
4.     Aluminum heads commonly use depths between .275"-.437"
5.     Propane applications require Hi Nickel / Tungsten Alloy seat. If you're looking for specially hard seats inquire via message.
6.     Aluminum heads require more press fit then iron.
7.     When going to oversize valves, care in selecting a seat size is important. OE iron heads are cast for smaller valves so there isn't enough wall thickness to install the typical seat size used for a oversize valve. Normally, a unique OD seat is required. Under these circumstances, a seat is selected with a .030- .040" bigger OD then the valve. This is normally done by a shop using adjustable seat cutters. (check around) Some seat manufacturers offer oversize OD seats in: +.010", .020", .030", .040" etc. In the case of a BBC w/ 1.880" exhaust, they would select a 1.875" seat +.040" which would be .035" bigger then the valve. Going bigger puts the casting at risk of breaking into the water jacket. Each head brand and model is different. Some castings are thicker then others. Consult your machinist for which heads will accept oversize seats and which ones won't.