When engineers at GM developed the LS1 engine, they provided
enthusiasts with the most technologically advanced small block ever. Now, Trick
Flow engineers have raised the bar to Serious Horsepower and developed LS1
cylinder heads that significantly increase performance.
During the development stage, Trick Flow engineers determined that the valve
angles needed to change from 15° to 13.5°. This change decreased valve
shrouding, increased mid-lift airflow, and increased rocker arm-to-valve cover
rail clearance. Testing also proved that relocating the spark plug position in
the combustion chamber further enhanced mid-lift airflow and increased the
rigidity of the casting to prevent cracking in the chamber area. Furthermore,
additional material was added to the rocker arm mounting points for high-rpm
valvetrain stability.
These new fully CNC-ported LS1 performance cylinder heads feature 215cc
intake runners, 80cc exhaust runners, 64cc combustion chambers, 2.04"
intake valves, 1.575" exhaust valves, bronze valve guides, and ductile iron
intake and exhaust valve seat inserts.
Assembled CNC-ported LS1 heads come equipped with 1.300" dual valve
springs (for hydraulic roller camshafts up to .600" of valve lift), Viton
canister-style valve seals, 7° machined steel valve locks, and 7° titanium
retainers.
|
Lift |
2.04" Intake
Valve |
1.575" Exhaust
Valve |
|
.100 |
68 cfm |
55 cfm |
|
.200 |
142 cfm |
115 cfm |
|
.300 |
215 cfm |
185 cfm |
|
.400 |
260 cfm |
230 cfm |
|
.500 |
300 cfm |
251 cfm |
|
.600 |
320 cfm |
259 cfm |
NOTE: Tests conducted at 28" of water (pressure) on a 3.900" bore fixture.
CNC-profiled chambers; exhaust with 1 7/8" pipe.
|
