630HP LS1 LS2 CNC Cathedral Port, 243 Heads, Assembled with Proline RPM Springs - PAIR (2 Heads)

CNC Ported LS1 LS2 CATHEDRAL PORT - 243 HEADS to suit the 5.7ltr and 6.0ltr

CNC Ported LS2 - 243 CYLINDER HEADS - Flows 632HP @ .600" lift camshaft!

Assembled, using Stainless Steel valves and DRP Polished Dual Spring kit (PAC Springs). Hand assembled by Total Performance in Melbourne. 

These Cylinder heads are a CNC Ported performance replacement to the GM 243 heads. All factory mounting points with the Performance of an upgraded CNC ported 243 port and as cast chambers to maintain compression ratio, all assembled and reay to bolt on and go!  

2 Assembled CNC Ported Heads included in sale. OUTright (no exchange)

Brand New Pair of genuine DETROIT RACING PRODUCTS Cylinder heads.  

• CNC Ported - In Melbourne, Australia
• Intake Port:  241cc (CNC Ported)
• Exhaust Port:  84cc (CNC Ported)
• Intake Port dimensions: 3.300" H x 1.120" W
• Factory Valve Guides 0.500" OD x 8mm stem. - see photo of checking tolerance. 
• Hard 355-T6 Aluminium - Race Quality.
• 3 Angle Valve Seats - machined - ready for assembly
• Deck thickness:  0.360"
• Intake Valve size:  2.00" factory size*
• Exhaust Valve size: 1.55"  factory size*
• Combustion Chamber:  66cc  - as cast                 

Exceptional Quality for a Wow factor of a price! 

These Cylinder heads flow and work like you wont believe. Best Bang for your Buck! 

Dont waste your time or money on rebuilding old units - upgrade now. Forget the headaches, poor valve seats and crack testing woes.

Assembled using: 

• PAC Polished Dual Valve Springs
  • Valve Spring Rate: 160 lbs Seat pressure & 415 lbs/in Rate. (Proline Series)
  • Open Pressure @ .620" lift 420 lbs
  • Max Lift: 0.670" @ .060" safety to coil bind.
  • Coil bind: 1.067"
• DRP Stainless Steel Valves (Made in the Argentina)

Assembled at Total Performance - Melbourne - Australia   

Flow Figures:  Lift 0.xxx" and flow in CFM note:  

Flow Figures: Taken at 28"hg on a 4.000" Bore