storm_beck1960 Posted April 27, 2009 Report Share Posted April 27, 2009 Well this is an update, I finally got the 4.9 to run for the first time today The weather, my health, and my work schedule had caused most of the delay, but it sure was good to hear the old girl fire up Note to anyone else planning this kind of swap: Be ready to spend a lot of time rerouting all the vac lines and fuel lines as things are routed diffrent from the 1990 and 1991 sedan devilles. but other than that it is an almost direct swap. thanks to all the advice and help along the way Link to comment Share on other sites More sharing options...
Dave in Texas Posted April 28, 2009 Report Share Posted April 28, 2009 Easiest post I've ever read! Glad to read you accomplished the swap. Isn't the exhaust system(manifolds/pipe-size) larger in the 4.9L? GM Reman 4.1 engine Dec '08 Link to comment Share on other sites More sharing options...
Ed Hall Posted April 29, 2009 Report Share Posted April 29, 2009 Good work for tackling something that has rarely been done and proving that it can be done!! We look forward to hearing more about how she runs. Link to comment Share on other sites More sharing options...
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