ENGINE PRO RACING Chevrolet LS1 & 2 Cathedral intake ports, 15 degree
ENGINE PRO RACING Chevrolet LS1, LS2 Cathedral intake ports, 11 degree
These heads are sold in Pairs
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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
| Product Name | ENGINE PRO RACING Chevrolet LS1, LS2 Cathedral intake ports, 11 degree |
|---|---|
| Brands | Engine Pro |
| Engine | GM / LS |
| Make | Chevrolet, Holden |
Delivery & Freight
We are an Australian-based company that ships items nationally and internationally, usually within 48 hours of receiving your order. High-value items shipped internationally are sent via DHL Express, while lower-value items are sent via Australia Post Express unless otherwise instructed.
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Disclaimer:
Product images are for description purposes only. Actual product may vary.
Shipping calculations available at checkout.
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Why choose matched valve springs for performance cams?
Spring pressure must match the cam profile and rpm limit. Too little causes valve float; too much causes wear.
Do I need adjustable cam gears?
They allow fine-tuning of cam timing, especially useful after head machining or when running non-standard cams.
What is the recommended valve size for the ENGINE PRO RACING LS1, LS2 heads?
The ENGINE PRO RACING heads are designed to accommodate intake valves sized at 2.080 inches and exhaust valves at 1.600 inches. Ensure you use compatible valves to maintain optimal performance.
What is the combustion chamber volume of these LS heads?
These heads feature a combustion chamber volume of 61cc, which is critical for calculating compression ratios in your LS engine build.
Do I need to modify the intake or exhaust ports for fitment?
The intake ports have a size of 3.23 inches in height and 1.12 inches in width, while the exhaust ports measure 1.63 inches in height and 1.73 inches in width. Depending on your specific application, some port matching may be necessary for optimal flow.
What type of rocker arms should I use with these heads?
These heads are compatible with LS3 rocker arms, and the necessary rocker arm stands are included. Ensure proper alignment and clearance during installation.
What is the recommended deck thickness for these heads?
The deck thickness of these heads is 0.750 inches. This specification is important for ensuring proper sealing with the head gasket and maintaining structural integrity under high performance conditions.
