ENGINE PRO RACING Chevrolet LS1, LS2 Cathedral intake ports, 11 degree

Bare Head Pair – Cathedral Intake Ports

This bare head pair features cathedral intake ports with a volume of 250cc and an 11-degree valve angle, designed to accommodate the OE 4 head bolt configuration.

Specifications:

• Material: Aluminium
• Combustion Chamber Volume: 61cc
• Intake Runner Volume: 252cc
• Intake Port Size: 3.23″ H x 1.12″ W
• Exhaust Runner Volume: 102cc
• Exhaust Port Size: 1.63″ H x 1.73″ W
• Intake Valve Size: 2.080″ (01-2810-8)
• Exhaust Valve Size: 1.600″ (01-2820-8)
• Valve Stem Diameter: 8.00mm
• Valve Length: +0.500″
• Valve Angle: 11 Degree
• Valve Guide Seal Diameter: 0.500″
• Valve Guide Material: Manganese Bronze
• Valve Spring Base Diameter: 1.555″
• Rocker Type: LS3 (Rocker Arm Stands Included)
• Rocker Bolt Mounting Space: 2.115″
• Deck Thickness: 0.750″

Flow Data @ 28″ (CFM):

Intake:

• @.300″: 220
• @.400″: 272
• @.500″: 320
• @.600″: 338
• @.700″: 345

Exhaust:

• @.300″: 150
• @.400″: 200
• @.500″: 210
• @.600″: 220
• @.700″: 228