swift13 Posted April 21, 2009 Report Share Posted April 21, 2009 quick question here im just unsure of me and my dad are swapping an engine the 3400 motor went bad and we are putting in a 3100 motor both sfi. the intakes are being swapped so it will still say 3400 sfi, i was telling him i dont think it will work unless the something is changed but he says it will be fine is this ok to do or does something else need to be done??? Quote Link to comment Share on other sites More sharing options...
AL Posted April 21, 2009 Report Share Posted April 21, 2009 I am pretty sure the heads are different Quote Link to comment Share on other sites More sharing options...
19Cutlass94 Posted April 21, 2009 Report Share Posted April 21, 2009 So your downsizing fomr a 3400 to a 3100? The heads are different but it doesnt matter, everything will bolt up. Use the top end to the 3400 and everything will be fine. Quote Link to comment Share on other sites More sharing options...
swift13 Posted April 22, 2009 Author Report Share Posted April 22, 2009 ok just wanted to be sure we didnt have any ecm issues or anything Quote Link to comment Share on other sites More sharing options...
GP1138 Posted April 23, 2009 Report Share Posted April 23, 2009 What car, what year?? If it's newer than '99, it should work fine, shouldn't it? Quote Link to comment Share on other sites More sharing options...
swift13 Posted April 24, 2009 Author Report Share Posted April 24, 2009 its on a grand am either a 98 or 99 Quote Link to comment Share on other sites More sharing options...
AL Posted April 24, 2009 Report Share Posted April 24, 2009 98 and 99 are completely different... 98 got the 3100 and the 99+ got the 3400. Quote Link to comment Share on other sites More sharing options...
swift13 Posted April 24, 2009 Author Report Share Posted April 24, 2009 it originally had the 3400 so 99 i guess Quote Link to comment Share on other sites More sharing options...
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