l67ss Posted December 15, 2013 Report Share Posted December 15, 2013 ive read that they started installing heads with better ports and larger valves in 03+ 3.8s (that were still series 2) yet they still have the same 200hp rating. did the head swap affect the power curve w/o raising power peak? curious as im getting an l36 from an 04 impala thanks Quote Link to comment Share on other sites More sharing options...
RobertISaar Posted December 15, 2013 Report Share Posted December 15, 2013 this is what i have for an 05. not sure if an earlier chart will be easy to find from GM. Quote Link to comment Share on other sites More sharing options...
RobertISaar Posted December 15, 2013 Report Share Posted December 15, 2013 well, i have something, but it doesn't look very good.... pulled from a 96 camaro VIK. http://www.gmheritagecenter.com/gm-heritage-archive/vehicle-information-kits.html you may find something better there? i find it hilarious how the F-body rates lower than all of the FWD applications.... as for early vs late, they look similar, but not identical. early shows much better output at lower RPMs, but peaks are the same. knowing GM, i expect there to be some manipulation of reality going on in the earlier chart. Quote Link to comment Share on other sites More sharing options...
l67ss Posted December 15, 2013 Author Report Share Posted December 15, 2013 well, i have something, but it doesn't look very good.... pulled from a 96 camaro VIK. http://www.gmheritagecenter.com/gm-heritage-archive/vehicle-information-kits.html you may find something better there? i find it hilarious how the F-body rates lower than all of the FWD applications.... as for early vs late, they look similar, but not identical. early shows much better output at lower RPMs, but peaks are the same. knowing GM, i expect there to be some manipulation of reality going on in the earlier chart. answered my question Quote Link to comment Share on other sites More sharing options...
RobertISaar Posted December 15, 2013 Report Share Posted December 15, 2013 97 has a clearer looking chart on page 25. 98 is better still. no charts in 99/up from the looks of it. Quote Link to comment Share on other sites More sharing options...
tornado_735 Posted December 15, 2013 Report Share Posted December 15, 2013 That torque curve is flat as shit. Quote Link to comment Share on other sites More sharing options...
RobertISaar Posted December 15, 2013 Report Share Posted December 15, 2013 That torque curve is flat as shit. at first glance, yes,but it starts dropping off badly after ~4200 or so. now compare it to an engine that was generally put in the same vehicles. it doesn't suffer anywhere near as badly. Quote Link to comment Share on other sites More sharing options...
RobertISaar Posted December 15, 2013 Report Share Posted December 15, 2013 more analysis: looks like they both end their plots around 180 lb-ft. the 3400 is at ~5600RPM, while the 3800 is around ~5800RPM. so, a 3400 at 5600 = a 3800 at 5800. bring the revs higher and then the lowly little 3400 actually overtakes the 3800. oddly enough, i don't have a L67 chart in my archive..... Quote Link to comment Share on other sites More sharing options...
l67ss Posted December 16, 2013 Author Report Share Posted December 16, 2013 that second chart is actually pretty useful too as my car has had a 3.4 la1 swap done to it Quote Link to comment Share on other sites More sharing options...
RobertISaar Posted December 16, 2013 Report Share Posted December 16, 2013 i figured it might be. Quote Link to comment Share on other sites More sharing options...
l67ss Posted December 16, 2013 Author Report Share Posted December 16, 2013 still gonna swap it for the 3.8, get it ready to top swap it Quote Link to comment Share on other sites More sharing options...
19Cutlass94 Posted December 17, 2013 Report Share Posted December 17, 2013 All I can add to this, is that the 3400 sounds good shifting at 6800rpm Quote Link to comment Share on other sites More sharing options...
l67ss Posted December 17, 2013 Author Report Share Posted December 17, 2013 All I can add to this, is that the 3400 sounds good shifting at 6800rpm Yeah I am gonna miss the sound of my 3.4, punched it to pass someone touched 105 MPH the sound was almost sex lol Quote Link to comment Share on other sites More sharing options...
RobertISaar Posted December 17, 2013 Report Share Posted December 17, 2013 All I can add to this, is that the 3400 sounds good shifting at 6800rpm you have enough cam to make that worthwhile though..... most of us don't. Quote Link to comment Share on other sites More sharing options...
l67ss Posted December 17, 2013 Author Report Share Posted December 17, 2013 you have enough cam to make that worthwhile though..... most of us don't. I has stock can, when I go past 6k, it bitches at me lol Quote Link to comment Share on other sites More sharing options...
l67ss Posted March 9, 2017 Author Report Share Posted March 9, 2017 Bumping this because I've needed it a couple times lol Quote Link to comment Share on other sites More sharing options...
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