SmoothSteve3 Posted September 11, 2003 Report Share Posted September 11, 2003 Hey guys- Has anyone made any progress with the 3.1 MPFI performace 1.6 ratio pushrods and rockerarms? Last I heard, there was a slight problem with the guide plates or what not....... SmoothSteve3 1990 Chevy Lumina 3.1 Liter V-6 Ride on White Lightning Quote Link to comment Share on other sites More sharing options...
Jon89le Posted September 11, 2003 Report Share Posted September 11, 2003 Umm, whats wrong with the guide plates? I read about this somewhere else but like a week past and i couldnt find the topic to ask the question. Im just wondering because im also thinking about putting the 3100 1.6ratio rockers in my 3.1L. Thanks Quote Link to comment Share on other sites More sharing options...
Robby1870 Posted September 11, 2003 Report Share Posted September 11, 2003 Jon89le, if you put 3100 roller rockers on a 3.1L, some machining of the heads has to be done to allow for clearance. SmoothSteve3, yeah, for me, the pushrods rubbed the guideplates too much (due to the 1.6s), and caused them to vibrate too much, and eventually they would break. I am going to look into machining the guideplates to allow for the 1.6s, but I havent had time yet (or a spare motor to work with). Hopefully, I can get it done this year some time Robby Quote Link to comment Share on other sites More sharing options...
Jon89le Posted September 11, 2003 Report Share Posted September 11, 2003 some machining of the heads has to be done to allow for clearance. Clearance for what? Like whats interfering? Would it matter if i said i had iron head studs? I got them to make my system adjustable. Quote Link to comment Share on other sites More sharing options...
Robby1870 Posted September 11, 2003 Report Share Posted September 11, 2003 If you use the 3100 roller rockers, grooves in the head for the pushrods need to be machined a little so the pushrods wont rub. The adjustable studs dont matter. Besides, the only 1.6 stock rockers are off of 2000+ (I think) 3400s. 3100s up until 97 had 1.5 rockers like the 3.1L 97+ had 1.5 roller rockers Robby Quote Link to comment Share on other sites More sharing options...
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