3.4L/3400 Top End Swap

[Robindehood]

You'll also need valve springs. Get the comp 26986 springs.

I think I'm just going to get the cam package. It comes with those springs as well as a timing chain cover gasket haha. I'll also need the custom length pushrods and I'll probably also order a couple other things while I'm there that I need. Maybe I can get a deal for a decent sized order haha

[peyo32]

Just swapped 3.1 chevy malibu engine to 3.4 engine? So far no problems. Any tips or anybody do it before?


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[Robindehood]

Just swapped 3.1 chevy malibu engine to 3.4 engine? So far no problems. Any tips or anybody do it before?


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Not sure if you have the right thread man. This is for the top end swap, not an entire engine swap.

[Robindehood]

Well I guess I could give you guys an update. I ordered a custom cam from wot-tech along with the hardened custom length pushrods a couple of months ago and I'm just waiting on my lifters and springs. I was just wondering what you guys think I should run for injectors?

[caffeine]

28# trailblazer injectors

[Robindehood]

Damn caffeine, you're quick haha.

[Robindehood]

What years are they in?

[Robindehood]

Also, would it run ok on the stock 3400 injectors?

[caffeine]

Probably depends on the cam whether or not stock injectors will be enough. AFAIK all trailblazers with the inline-6 have the 28# injectors.

[Robindehood]

Well the cam is wot-techs street/strip cam ground onto a flat tappet cam, specs are
259/265 adv duration
.506"/.506" lift
113 LSA

[Robindehood]

Can anyone chime in on lifters? I know flat tappet, but does it matter if they're high energy or magnum or anything? I'm planning on comp to match the cam

[caffeine]

3.4L/3400 Top End Swap

I wouldn't recommend stock injectors with that cam. Lifters I'm not really sure.

[Robindehood]

Hey man, is there any where else I can get ahold of you a little better if I have questions? Digits or Facebook?

[Robindehood]

Also back to the injectors. I can't seem to find any scrap yards around me that have any 4.2Ls that I could rob the injectors from. Does anyone know of any others that might work other than the #28? I remember reading somewhere that some from a 2002+ ecotech 2.2L fit right in the rail and I believe they were 24lb delphi multec II. Can anyone confirm if these would work?

[bachert24]

Why not get the injectors off a supercharged GP? They are supposedly 36#, but I flow tested mine at 29#. Works for what you wanna do.