*PAIR* BBC 454 Big Block Chevy Cylinder Heads, 290cc Oval Port, 110cc Chamber. Suits Hydraulic Roller, Proline PAC Springs

The DRP Chevy 454 Big Block Cylinder heads - 290cc Port. SOLD AS A PAIR

Hand Built to suit Hydraulic Roller or Solid Flat Tappet Camshafts.

Big Block Chevy 454 cylinder Heads 290cc runner with as casts port heads are designed for BBC Big Block Chevy motors. High quality castings and affordable performance, These 454 Cylinder heads feature as-cast ports and are designed for entry-level application and replacements. 

These cylinder heads are hand built in Melbourne using Comp Cams, PAC springs hardware.

Assembled Specs: 

Valve Springs: DRP Proline by PAC Valve Springs (Polished LS dual light weight)

Valve Springs Rate: 155lbs @ 1.900" / 415 lbs/inch

Max Lift:  0.700"

Valve Spring Open Pressure: 425 lbs @ .650" lift

Valves: DRP Stainless - made in Argentina.

Hardware: Comp Cams Retainers, Locators & Race machined locks.

Cylinder Heads Quantity: Sold as a PAIR

BBC Cylinder Head Specs:

Alternative Names: Oval Port BBC, Peanut Heads replacement.

Combustion Chamber Volume (cc):   110cc

Intake Runner Volume (cc):   290cc

Exhaust Runner Volume (cc):   135cc

Minimum Cross Sectional Area:  2.895" sq/in

Intake Port Dimension:  2.030" x 1.830" 

Exhaust Port Dimension: 1.770" x 2.010"

Cylinder Head Style:   Bare

Cylinder Head Material:   Aluminium

Intake Port Shape:   OVAL Rectangle 

Intake Valve Diameter (in.):   2.250" in.

Exhaust Valve Diameter (in.):  1.880"  in.

Intake Port Location:  Standard

Exhaust Port Shape:   

Exhaust Port Location:  0.375" Raised

Spark Plug Style:  Angle

Rocker Arm Studs Included:  NO

Rocker Arm Thread Size:  7/16 in.-20

Guide plates Included:  NO 

Valve Cover Mounting Style:  Perimeter bolt

Accessory Bolt Holes Drilled:  Yes

Intake Valve Angle:  24°

Exhaust Valve Angle:  15°

Valve Guide Size: 11/32"

Valve Guide Material:   Bronze

Valve Seat Machine Style:  3-angle

Cylinder Head Colour:   Natural as Cast

Steam Holes Drilled:  No

Flat Mill:  .006" per cc / Minimum Chamber 102cc

Deck Thickness: 0.750"

Minimum Bore Diameter: 4.250"

Quantity:   Sold as a PAIR

Notes:

Head Bolts: ARP 135-3703 (Mark IV)

Head Bolts: ARP 135-3707 (Mark V)

Head Gasket: Fel-Pro 1017-1 (Mark IV)

Head Gasket: Fel-Pro 1047 (Mark V and VI)

Intake Gaskets: Fel-Pro 1210 / Fel-Pro 1212