A 4.9 engine running off the 4.1 injection system is not going to run very well. To make it run correctly, you would either have to run the 4.9 with a carburator, an aftermarket fuel injection system such as megasquirt or find a donor car and transfer all the electronics over. It would be a really neat project and with the 87 being shorter and smaller, it would be a quite a hot-rod.djcalaska said:Has anyone successfully changed the 4.1 in an 87 deville to 4.9????
Are there a lot of changes needed??? Seems like I have seen one person that changed from 4.1 to 4.5 without a lot of modifications
Since I still have my original 4.1 liter block, I can say for sure that the lifter retainer can in fact be attached to the HT4100 lifter carrier. It has the bolt holes and everything. And mine is from an '87. However, I still would advise against swapping lifters to an engine that didn't use a another type in the first place. If you're going to rebuild an HT4100, then do it by the book: you'll find that the replacement parts should be of better quality for such a rebuild.caddeville said:The 87 HT4100 blocks were early castings of the 4.5 liter. They already have the roller cam hold downs, but they aren't drilled. One way to check if an 87 HT4100 block is a 4.5 casting is the reinforcing ribs on the sides. The 4.5 block has the vertical and triangular reinforcing ribs, the transverse 85 86 4.1 just had the triangular ribs and the RWD 4100 didn't have any at all. I would just get a reman 4.9 and swap manifolds and valve covers and run it on the TBI system, if the manifolds are same size of coarse (they should be).
Yes, my answer is that the guy on Ebay ( :hmm: ) is wrong. Unless I'm proven wrong by someone else or if I try and mix parts during my next rebuild and prove myself wrong, then I'll change my answer. Until then, I stand by my previous statements.caddeville said:A guy on ebay was sellin a reman 4.9 and said just swap out the intake and valve covers for a 4.1/4.5 swap. Looks like he was wrong. Thanks for the info. If my engine blows (god forbid), i'll install 4.9 with tranny, with all electronics (just computer right?). I have access to many complete donor cars.
Well then, here's what you need to do:caddeville said:I will most likely then end up making a TBI running 4.9, i really like the taillights and the shape of the whole car on the 87 88 devilles, plus my caddy has a custom flake paint job (july 2006), custom sound system, wheels, etc. I'd rather do an engine change than buying a whole different car even though i can pick one up a wrecked one for 250$ with low milage. Such as i did with mine.