HPE / ET Stage 3 5.3L heads
03-25-2007, 10:58 PM
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Join Date: May 2005
Location: Saginaw, MI
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HPE / ET Stage 3 5.3L heads Figured I would throw these up here to see if anyone is interested.
I just took them off the GTO so they are pretty dirty, I will post better pictures when I have cleaned them up a bit.
Heads and springs (Patroit Performance Gold dual springs) have approx 6000 miles on them.
Springs are good for .650 lift, 2.055 intake valves and 1.57 exhaust valves, Titanium retainers etc.
Flow numbers from HERE
Looking for $1250 + shipping,
These are a nice set of heads and i have been very happy with them but they wont work with my new setup.
I just took them off the GTO so they are pretty dirty, I will post better pictures when I have cleaned them up a bit.
Heads and springs (Patroit Performance Gold dual springs) have approx 6000 miles on them.
Springs are good for .650 lift, 2.055 intake valves and 1.57 exhaust valves, Titanium retainers etc.
Flow numbers from HERE
Cylinder Head: LS1 Application: Street / Race
Port Volume: 230cc Chamber Volume: 64cc
Test Bore: 4.000" Test Pressure: 28.00" Water
Intake Valve: 2.055" Exhaust Valve: 1.570"
Valve Lift Intake Exhaust Valve Lift
.100" 82 58 .100"
.200" 162 115 .200"
.300" 210 154 .300"
.400" 265 187 .400"
.500" 297 209 .500"
.550" 310 214 .550"
.600" 320 222 .600"
.650" 329 227 .650"
Exhaust to Intake Flow Ratio 71%
Port Volume: 230cc Chamber Volume: 64cc
Test Bore: 4.000" Test Pressure: 28.00" Water
Intake Valve: 2.055" Exhaust Valve: 1.570"
Valve Lift Intake Exhaust Valve Lift
.100" 82 58 .100"
.200" 162 115 .200"
.300" 210 154 .300"
.400" 265 187 .400"
.500" 297 209 .500"
.550" 310 214 .550"
.600" 320 222 .600"
.650" 329 227 .650"
Exhaust to Intake Flow Ratio 71%
These are a nice set of heads and i have been very happy with them but they wont work with my new setup.
