BBC

AFR Big Block Chevy 290cc Oval Port Magnum Aluminum Cylinder Heads

Product Description

AFR 290cc Oval Port “Magnum” BBC Head

Our Medium Sized Oval Port

BBC 290cc Oval Port Cylinder Head

For incredible in “Oval Port” performance, the fully CNC
ported AFR 290 has no competition. With flow figures most small
to medium sized rectangular port castings would be envious of, these
high flowing “Ovals” produce tremendous airspeed and
really pack a punch. Ideally suited for 396-509 CID street and strip
performance, as well as circle track applications which require
strong low and mid-range torque to help accelerate a car coming
off a corner. Once again, AFR has included it’s trademark 3/4”
deck, reinforced rocker stud bosses, and thick rugged castings,
so you can own the strongest and most efficient heads on the market
today. Premium hardware such as 2.250/1.880 one piece stainless
valves, 1.550 double springs, 10 degree locks and retainers, and
high quality studs and adjustable guideplates all come as standard equipment.
Take note the higher flowing exhaust ports and bolt pattern are raised .375 over stock
location, this rarely affects chassis fitment. These heads have no EGR and are not emissions legal.

290cc BBC Cylinder Head Flow Chart

290cc Oval Port Magnum Street Cylinder Head Features:

  • 100% CNC Ported Combustion Chambers
  • 100% CNC Ported Exhaust Ports
  • 100% CNC Ported Intake Ports
  • Competition 5-angle Valve Job
  • 290cc Intake Ports
  • Intake Valve, 2.250” x 5.500” Overall Valve Length
  • Exhaust Valve, 1.880” x 5.448” Overall Valve Length
  • Hydraulic Roller Valve Spring: 1.550” OD Hydraulic Roller Dual Valve Spring, 170 lbs on seat, 473 lbs @ .600” maximum lift
  • Solid Roller Valve Spring: 1.550” OD PAC Racing Solid Roller Valve Spring, 225 lbs on seat, .680” maximum lift
  • 10° Manley 4140 Chrome Moly Retainers
  • 10° Valve Locks
  • 7/16” Rocker Studs
  • Adjustable 3/8” Guide Plates
  • Viton Valve Seals
  • Hardened Spring Seats
  • Intake Valve Seats
  • Exhaust Valve Seats
  • Bronze Valve Guides
3630 290cc Oval Port 24° Magnum Street/Strip Aluminum Cylinder Heads

  • BB-Chevy
  • 113cc Combustion Chambers
  • Bare Head Only
  • Sold in Pairs, 2/pkg.
3640 290cc Oval Port 24° Magnum Street/Strip Aluminum Cylinder Heads

  • BB-Chevy
  • 113cc Combustion Chambers
  • 1.550” Hydraulic Roller Dual Valve Spring
  • Assembled
  • Sold in Pairs, 2/pkg.
3650 290cc Oval Port 24° Magnum Street/Strip Aluminum Cylinder Heads

  • BB-Chevy
  • 113cc Combustion Chambers
  • PAC Racing 1.550” Solid Roller Valve Spring
  • Assembled
  • Sold in Pairs, 2/pkg.