Cam for LS3 based 418?
03-09-2008, 05:05 PM
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Cam for LS3 based 418? Brian from LME is currently building short block for me and I just thought I'd pick your brains on cam choices.
Here's the specifics:
LS3 block, K1 4" crank/ K1 forged rods/ Wiseco custom pistons with slight dome and valve reliefs
AFR big bore 225's 70cc(already checked) CNC ported, 2.08" I /1.6" E
SCR should be right at 11.75 with proper gasket
Ported fast 90/LS2 TB
Heads have been flowed, here are the flow numbers:
VMAX MOTORSPORTS, INC.
TEST SUBJECT: AFR CNC LS- CYLINDER HEADS
AP = 28 ”H2o, All tests in CFM
Test
LIFT 1. 2. 3. 4.
100 68 46
150 107 83
200 151 115
250 193 145
300 225 176
350 250 197
400 272 209
450 295 219
500 299 225
550 309 228
600 315 231
650 302 232
700 302 233
AFR CNC Intake Port # 4.
1. Baseline Check AFR CNC Machine Ported. 2.080 INT. Valve.
Tested with VMAX Flow Entry.
AFR CNC Exhaust port # 4.
2. Baseline Check AFR CNC Machine Ported, 1.600 EXH. Valve.
Without a Flow Test Pipe.
Motor is going into my '03 Z06, car has 3.73 rear gears
Car is a weekend warrior, some road track days and a few dragstrip days per season. N/A motor, no plans for FI or Nitrous.
Myself and head porter I am using are thinking 244/256 .625/.635 on 111+3
or 112+2.
I would like to see around 550/500 to the tires. Am I crazy? Any and all opinions/suggestions are welcome.
Thanks guys, Sorry about the long post, I wanted to include as much info on the build as possible.
Jimbo
Here's the specifics:
LS3 block, K1 4" crank/ K1 forged rods/ Wiseco custom pistons with slight dome and valve reliefs
AFR big bore 225's 70cc(already checked) CNC ported, 2.08" I /1.6" E
SCR should be right at 11.75 with proper gasket
Ported fast 90/LS2 TB
Heads have been flowed, here are the flow numbers:
VMAX MOTORSPORTS, INC.
TEST SUBJECT: AFR CNC LS- CYLINDER HEADS
AP = 28 ”H2o, All tests in CFM
Test
LIFT 1. 2. 3. 4.
100 68 46
150 107 83
200 151 115
250 193 145
300 225 176
350 250 197
400 272 209
450 295 219
500 299 225
550 309 228
600 315 231
650 302 232
700 302 233
AFR CNC Intake Port # 4.
1. Baseline Check AFR CNC Machine Ported. 2.080 INT. Valve.
Tested with VMAX Flow Entry.
AFR CNC Exhaust port # 4.
2. Baseline Check AFR CNC Machine Ported, 1.600 EXH. Valve.
Without a Flow Test Pipe.
Motor is going into my '03 Z06, car has 3.73 rear gears
Car is a weekend warrior, some road track days and a few dragstrip days per season. N/A motor, no plans for FI or Nitrous.
Myself and head porter I am using are thinking 244/256 .625/.635 on 111+3
or 112+2.
I would like to see around 550/500 to the tires. Am I crazy? Any and all opinions/suggestions are welcome.
Thanks guys, Sorry about the long post, I wanted to include as much info on the build as possible.
Jimbo
03-09-2008, 09:35 PM
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What lobes do you plan on using? I ran a 244/250 113 .612 lift on my previous setup that was nice all around cam for street and strip. I run AFR 225 that were 72cc but I sent them to Tony Mamo at AFR who did a mild rework, so I changed cams.
03-09-2008, 10:06 PM
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I think that is a good cam choice, but maybe try a XE lobe for the exhaust with a slower ramp rate and lower lift. Of the two, I would pick the 112 LSA.
03-09-2008, 10:32 PM
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Are my power expectations realistic, or am I way out of the ballpark?
Jimbo
03-09-2008, 10:43 PM
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For sure expect over 500rwhp. 550 is tougher, but you have a well spec'd setup. I'm no dyno expert, but I would expect that setup to dyno around 530rwhp.
Last edited by DrkPhx; 03-09-2008 at 10:56 PM.
03-10-2008, 12:30 AM
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I have a new comp 250/262 .598 .598 113+2 if you want to try it. Similar to the specs your looking at just a little bigger. I spec'd it for my ported L92's, but decided to go solid roller. PM me if interested.
Scott
Scott
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03-10-2008, 11:08 AM
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Jimbo
03-18-2008, 09:17 PM
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Thought I'd bring this thread back up to the top. Short block should be done soon and still need to decide on a cam for it. Anybody? Patrick G, where are you?
