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918motorsports

M311 273cc LS3 Cylinder Heads (SET)

M311 273cc LS3 Cylinder Heads (SET)

$3,199.00 USD
$3,199.00 USD
Sale Sold out
  • Fully CNC ported, 68cc chamber volume
  • 273cc intake port, 112cc exhaust port and 11° valve angle
  • High Quality Components:
    • Black Nitride Stainless Steel Severe Duty Valves
    • Custom PAC .700” Lift Valve Springs
    • Titanium Retainers
  • O-Ringed Exhaust Ports (Hi-Temp Silicone O-rings Included)
  • 2″ Headers Recommended
  • Sold Per Set

Billet rockers stands Included for use of stock  ls3 rocker arms

 Items will ship from manufacturer 

Specifications

Description
Specification
Part Number
Min. Bore Dia.
4.000”
Intake Port Volume
273cc
Exhaust Port Volume
112cc
Combustion Chamber Volume
68cc
Intake Valves
FED Prime Grade Stainless Steel 2.165
913005
Exhaust Valves
FED Prime Grade Stainless Steel 1.600
913007
Valve Springs
.700″ Lift FED exclusive by PAC
914005
Retainers
FED Titanium-64 – LS Dual Spring
914040
Valve Locks
GM Valve Lock
916051
Valve Seals
U.S. Seal – Viton High Heat Seal
U.S. Seal 805
Billet Rocker Stands
913001
Exhaust Gaskets
914032
Head Gaskets:
4.125” Bore
Spark Plug:
Gasket Seat – .708” Reach PLEASE VERIFY
Tapered Seat – .708” Reach PLEASE VERIFY
Pushrods:
8.100 – 8.250” Length x 3/8” Diam.
Lifters:
Standard
Rockers:
Standard LS3 w/Billet Rocker Stand
w/Billet Rocker Stand – Standard
Shaft Rockers
JESEL – KPS462173

Materials

Shipping & Returns

Dimensions

Care Instructions

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