mxsailor803 Posted January 29, 2013 Report Share Posted January 29, 2013 Currently I'm thinking about ordering a set of TEA 317's for my mostly stock lq9. My truck currently has 148k miles on it. Now for the question. I would love to put these heads on my motor but I'm concerned about general wear and tear. What would you guys consider a safe compression test readings before needing a full rebuild? Now for the injector question. I know there is a such thing as over carbing a engine but does efi follow the same rules? Quote Link to comment Share on other sites More sharing options...
northmess Posted June 8, 2013 Report Share Posted June 8, 2013 I too would like to know this since my 03 ss has 139k on it and i am considering doing either 408 kit or blower but am worried about the motor. Quote Link to comment Share on other sites More sharing options...
chpspecial Posted June 8, 2013 Report Share Posted June 8, 2013 Do a leak down test, not a compression. If you are with in 10-15% leak down, mod away, as for injectors, as long as you are porperly tuned for them, the PCM will not over fuel the engine. It will just use less injector duty cycle. IF you do larger injectors with no tune, then yes, the engine will flood with fuel. Quote Link to comment Share on other sites More sharing options...
battousai Posted June 9, 2013 Report Share Posted June 9, 2013 Do a leak down test, not a compression. If you are with in 10-15% leak down, mod away, as for injectors, as long as you are porperly tuned for them, the PCM will not over fuel the engine. It will just use less injector duty cycle. IF you do larger injectors with no tune, then yes, the engine will flood with fuel. how would one do a leak down test? Quote Link to comment Share on other sites More sharing options...
gcosse05 Posted June 9, 2013 Report Share Posted June 9, 2013 (edited) Subscribed.. 03SS 167K. READY TO MOD!! Edited June 9, 2013 by gcosse05 (see edit history) Quote Link to comment Share on other sites More sharing options...
Joe Roknic Posted June 9, 2013 Report Share Posted June 9, 2013 (edited) I too would like to know this since my 03 ss has 139k on it and i am considering doing either 408 kit or blower but am worried about the motor. If you do a 408 build the bottom end of your motor would be new... i think i would bo that before i would even consider putting a blower on it.. just my humble opinion Edited June 9, 2013 by SS Muscle Truck (see edit history) Quote Link to comment Share on other sites More sharing options...
chpspecial Posted June 9, 2013 Report Share Posted June 9, 2013 [quote name='battousai' how would one do a leak down test? You will need a special tool with two gauges. You feed in compressed air into each cylinder while the piston is at TDC. The first gauge will read the psi in the system, the second will give you the % leak down. If you have a problem area, you will hear where you are leaking compression. I.e. intake/exhaust valves, head gasket, piston rings... Sent from my ADR6400L using Tapatalk 2 Quote Link to comment Share on other sites More sharing options...
GI.SS Posted June 10, 2013 Report Share Posted June 10, 2013 leakdown test is a MUST but realistically if your leaking anything above the rings then when you put heads on you wont be leaking anymore Quote Link to comment Share on other sites More sharing options...
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