19431810 Cylinder Head Assembled RS-X CNC ported
Call before orderingFully machined and assembled; 449cc intake port' 161cc exhaust port; 70cc combustion chamber; 2.450"1.800" titanium valves with 5/16"stem OD' Ovate wire-type beehive valve springs with 1.589" OD (large end)' Steel 10-deg, retainers with 1.115" OD
The high-rpm airflow requirements of Pro Stock engines influenced the design of Chevrolet Performance’s RS-X spread-port Big-Block cylinder head design, which is used on the ZZ632 Deluxe crate engine. It uses a raised, symmetrical port design rather than the conventional Big-Block siamese design, for greater port-flow equalization. The heads are designed for large-displacement high-performance applications, where high-rpm airflow is a must for maximum performance.
They’re used with a shaft-style roller rocker system.
Assembled heads feature 2.450/1.800-inch titanium valves and beehive-type springs.
NOTE: Must be installed only on blocks with four valley lugs per bank.
RS-X Spread-Port Cylinder Head Technical Notes:
- Made from 356-T6 aluminum
- Will fit large-bore standard and tall-deck blocks
- 0.750" deck
- Intake part volume (nominal): 449 cc
- Exhaust port volume (nominal): 161cc
- Chamber volume (nominal): 70cc
- Intake flow: 481 cfm @ 0.787"
- Exhaust flow: 347 cuf @ 0.787"
- Rocker bar required
- Designed for shaft-mount roller rocker arms
- Designed for 7/16" pushrods
- Requires custome exhaust headers
