Robby1870 Posted January 5, 2003 Report Share Posted January 5, 2003 I found 1.6:1 ratio rocker arms for my 3.1L and the set is $139. The guy from Comp Cams said about +10-15 HP. Do you guys think it is worth it?? I would rather do this than a cam that is way too much work. I'll have to wait til I get my income taxes back. Just curious what y'all thought. My other option would be 62mm throttle body. Quote Link to comment Share on other sites More sharing options...
Guest Botan Posted January 5, 2003 Report Share Posted January 5, 2003 go for it. I just want to mention that it is not that much more work to change out the cam. You will have to take the upper and lower intake off anyways, so you might as well do the cam while you are at it. Quote Link to comment Share on other sites More sharing options...
Robby1870 Posted January 5, 2003 Author Report Share Posted January 5, 2003 good point I'll consider it. This won;t be done for like 3 or 4 months though I;ll be at college Quote Link to comment Share on other sites More sharing options...
Whiskey River Posted January 7, 2003 Report Share Posted January 7, 2003 Before you button the engine up and crank it over with the started, check to make sure your valve clearance is OK. Otherwise, you'll end up with a lot of bent valves. Quote Link to comment Share on other sites More sharing options...
Guest Posted January 7, 2003 Report Share Posted January 7, 2003 Has anyone on this sight done this? I'd be interested in doing it too. Also, is it true that Lift is more important on a fuel injected car than duration? Due to the fact that the carb is always working, therefore duration is key, where as the FI car is getting a quick jet of mixture, so more lift would allow more of the mixture in? Quote Link to comment Share on other sites More sharing options...
toastemcutlass Posted January 7, 2003 Report Share Posted January 7, 2003 my buddy put 1.6 rollers and it made a big difference. he also had ported upper and lower intake as well as other things but, when my 3.4 was stock he almost kept up and that is good for the 3.1 and it was a sedan Quote Link to comment Share on other sites More sharing options...
Robby1870 Posted January 7, 2003 Author Report Share Posted January 7, 2003 -akthra what you said makes sense. That is what I assumed, which is why I am going to do this. I in a magazine where they installed 1.9:1 rockers on an L67 and it gave about 25HP at the wheels. They installed the same rockers on the N/A 3.8 and it gave about 13-15Hp at the wheels. Those are decent gains, and I know the rockers for the 3.1 are a smaller ratio, but seeing that article made me choose to do this. It will be a few months before I have time to do this, my income tax refund will help pay for it, so it will be maybe march, april or even may before I do this. If anyone gets it done before me let me know how it went. -toastemcutlass how hard was it for your buddy to port the manifolds?? And, more importantly, how much did it cost?? If I could my GP runnin with stock 3.4s that would be awesome. Quote Link to comment Share on other sites More sharing options...
toastemcutlass Posted January 7, 2003 Report Share Posted January 7, 2003 It was just a back yard job. the port and pollish kit from summit and my die grinder. so imagine if it was done professionaly Quote Link to comment Share on other sites More sharing options...
Brian P Posted January 9, 2003 Report Share Posted January 9, 2003 my buddy put 1.6 rollers and it made a big difference. he also had ported upper and lower intake as well as other things but, when my 3.4 was stock he almost kept up and that is good for the 3.1 and it was a sedan Was that engine otherwise stock (the 3.1 liter)???? Please let me know asap Quote Link to comment Share on other sites More sharing options...
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