PAIR ASSEMBLED BBC CHEVY ALUMINIUM CYLINDER HEADS 335cc / 118cc HYDRAULIC ROLLER - CHEVY BIG BLOCK

DRP DETROIT RACING PRODUCTS

BBC Chevy Big Block Aluminum Performance Cylinder Heads - Sold as a PAIR.

Hand Assembled using DRP Valves and Comp Cams 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:

• Premium Bronze Valve Guides.
• Hard 355-T6 Aluminium - Race Quality.
• 3 Angle Valve Seats
• Intake Valve size: 2.250"  X 11/32"    (Recommend 5.370" length)
• Exhaust Valve size: 1.880" X 11/32"  (Recommend 5.320" length)
• Combustion chamber size: 118cc
• Intake Port Volume: 335cc
• Intake Port Dimensions:   1.780" W x 2.500" H
• Intake Port Location    Stock
• Exhaust Port Volume: 148cc
• Exhaust Port Dimension:  1.900" W x 1.660" H
• Exhaust Port Location  .357" Raised
• Valve Angle            24°/4° Int, 15°/4° Exh
• Valve Spring Pocket Diameter   1.750"
• Minimum Bore Diameter          4.550" 
• Flat Mill               .006" per cc/ Maximum 105cc As Cast
• Angle Mill           .009" per cc/Maximum 100cc As Cast
• Valve Spring Installed heights: 
  • ​Intake with 5.370" long & 0.250" tip = 1.900" installed height
  • Exhaust with 5.320" long & 0.250 tip = 1.900" installed height
• Recommended Spark Plugs: 750 reach gasketed 5/8 hex. NGK-BCPR7ES
• Recommended Intake Gaskets: Felpro 1275 (larger) or Felpro 1252-3 
• Recommended Head Bolts:
  • BOLTS:  ARP-135-3603      6 POINT
  • BOLTS:  ARP-135-3703    12 POINT
• Intake Valves to suit: 
• Exhaust Valves to suit:  "DRP-BBC1880-5.350EXV-8"
• Springs: Comp Cams - 10 Deg retainers
  • 115 lbs seat
  • 305 lbs open @ 0.550" lift
  • Max lift: 0.660"  (with 060 to coil bind)

Does not include: Rocker Studs & Guide Plates.

Rocker Studs - we recommend

• DRP-100-7101 
• ARP-100-7101

Guide Plates - we recommend Comp Cams

• 4806-8      3/8" Pushrod
• 4820-8     7/16" Pushrod

FLOW FIGURES