Yes, it's possible to that swap. You'll need to use an adjustable Fuel Pressure Regulator (FPR) to dial in the correct fuel requirements for the larger displacement engine. Use the intake manifold and TBI from your 4.5. Hope this helps.
The 4.5 TBI can supply enough fuel if an adjustable FPR is used. Keep the 4.5 electronics as well as the original 440T4 non-electronic transmission.
One of the members has done this exact conversion sucessfully. Hope he chimes in on this topic.
The 4.9s are known to have that #1 main bearing thump/knock. As far as I remember GM made changes to eliminate the prblem after the first year of production (which is 1991). But looks like later models have the same problem.Another question....
Would there be a certain year of the 4.9 recommended or would it not matter at all??
I HAD A 1993 Seville 4.9L for 5 1/2 years and it had 188K when i got it and 266K when a hse blew on it my friend tried to fix it then he had a guy look at it and they both fixed it together that car i bought new trans at 210K, then new trans cooler lines new water pump, struts were broke for 2 1/2 years never a radiator problem over heated once in the wisconsin dells on a vacation but it had too much water in the system i found ouy later onhi ...just wondering if it is a good idea or possible to swap a 4.9 for a 4.5??
and would it be worth it?
for a 88 fleetwood
open to thoughts or suggestions
Why bother then with it if it works fine and has such low mileage. Maintain it and enjoy it. The 4.9 is better but not really worth swaping out IMO.Hopefully it is as easy as you guys make it sound
There is nothing wrong with my 4.5 it has 167k kilometers don't know off hand what that is in miles.
Thanks for the help guys.