4.2 serp conversion

Hi Folks,

Tried a search but nothing really came up. I have a 4.2 short block and a 4.6 fully dressed engine. Can I swap all the serp components over to the 4.2 i.e. 4.6 cam, cover, pulleys etc.

Shane

Not totally sure of all the details but yes I believe so.
You may have to use the sump and the front cover.
Obviously there's no distributor.
If you use the heads, you'll need to use composite gaskets to keep the short engine design compression 9.35?, or if you use steel gaskets it will raise it to about 10:1 which is what mine runs at. But I have the opposite, 4.6 with non serp and efi
There may be some machining to do with the bottom pulley.

Done a big of digging and found a post on here about the V8's. 3.5 and 3.9 are the same family all the rest are the other family. Think I'm just gonna go ahead and put it together and see what happens.

Well yes they are I suppose. But the differences are things like crossbolted crank mains caps and redesigned head fixing (which are interchangeable), cam retainer which can be omitted. But what are you going to do with ignition and fuelling?

shanecl said:

Done a big of digging and found a post on here about the V8's. 3.5 and 3.9 are the same family all the rest are the other family. Think I'm just gonna go ahead and put it together and see what happens.

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3.5 and 3.9 and 4.2 are the same family ,4.0 and 4.6 are a further development

cooltide said:

Well yes they are I suppose. But the differences are things like crossbolted crank mains caps and redesigned head fixing (which are interchangeable), cam retainer which can be omitted. But what are you going to do with ignition and fuelling?

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Will also use the 4.6 manifold and fuel rail, then megasquirt it.

jamesmartin said:

3.5 and 3.9 and 4.2 are the same family ,4.0 and 4.6 are a further development

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That's what I thought originally, but the thread said what I wanted to hear

shanecl said:

That's what I thought originally, but the thread said what I wanted to hear

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it is true ,but what did you want to hear