Speed Engineering LT1 Cylinder Heads - SOLD AS A PAIR- GARAGE SALE

Cylinder heads comes standard with .660” lift Manley Valve Springs, Seats, and Titanium retainers. 

SOLD AS A PAIR.

Features Include:
· Full CNC Intake and Exhaust Ports
· 6.2L+ Engines (Will not work on 5.3L Engines)
· Factory CC Combustion Chambers
· Manley .660” Spring Kit

Spring Specifics:
· 1.295'' O.D.
· 0.676'' I.D.
· 379 lbs./in. Spring Rate
· 155 @ 1.810'' / 405 @ 1.150''
· 0.660'' Max Valve Lift
· Double Spring (No Damper)
· 7° Titanium Retainer
· Viton Valve Seals

Cylinder Head Flow Numbers:
· .200” Lift (Exhaust 115CFM/Intake 199CFM)
· .250” Lift (Exhaust 135CFM/Intake 231CFM)
· .300” Lift (Exhaust 154CFM/Intake 264CFM)
· .350” Lift (Exhaust 182CFM/Intake 296CFM)
· .400” Lift (Exhaust 195CFM/Intake 318CFM)
· .450” Lift (Exhaust 208CFM/Intake 331CFM)
· .500” Lift (Exhaust 219CFM/Intake 338CFM)
· .550” Lift (Exhaust 231CFM/Intake 346CFM)
· .600” Lift (Exhaust 233CFM/Intake 353CFM)
· .650” Lift (Exhaust 238CFM/Intake 365CFM)
· .700” Lift (Exhaust 243CFM/Intake 371CFM)
· .750” Lift (Exhaust 246CFM/Intake 375CFM)
· .800” Lift (Exhaust 248CFM/Intake 379CFM)