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Ls1 Cylinder Heads Ported- Nascar Spec on 2040-parts.com

US $750.00
Location:

Ormond Beach, Florida, United States

Ormond Beach, Florida, United States
Very good condition-low miles
Brand:GM Manufacturer Part Number:Casting number 12546799

These are a pair of bare ported GM LS cylinder heads casting number 799. No valves, springs, retainers, seals or keepers.Guides and seats are included. These are used in the NASCAR Series LS spec engines. On an LS2 (6.0l) engine with 10.5 to 1 compression and a NASCAR spec camshaft they will support 625hp at 7000rpm. The below spec sheet shows that they are run with DelWest Tianium valves and PSI springs. I have some of those available at extra cost. They are not included with the heads. 

NASCAR SPEC ENGINE CYLINDER HEAD SPEC DATA SHEET NASCAR CAMPING WORLD April 30, 2009
   
Cylinder head casting number   12564799
 Intake port volume     229cc 
Exhaust port volume    84cc 
Chamber volume     64cc 
Valve guide material    powdered iron 
Valve seat material     powdered iron  
Intake valve part number    IVLS6-oeml-8-a 
Intake valve head diameter   2.00  
Intake valve length     4.960 
Intake stem diameter    .313 
Intake valve material    Coated Titanium 
Intake valve weight     68 grams  
Exhaust valve part number EVLS6-oeml-8 
Exhaust valve head diameter   1.550 
Exhaust valve length    4.965 
Exhaust stem diameter    .313 
Exhaust valve material    Coated Titanium 
Exhaust valve weight    55 grams  
Intake tip height      2.075 
Exhaust tip height     2.065 Valve spring installed height   1.800  
Valve spring part number    NS1511ML 
Retainer part number    LS1-41-16 
Valve spring locator part number  4747 
Valve keeper part number    13098-16 
Valve seal part number    VS809    
Valve tip height is measured from valve tip to spring pad on the cylinder head with no valve spring locator.   

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