[Diy_efi] Vortec 4200 Inline 6 ECM - Twin Turbo -

jb jonnbell
Fri Aug 19 02:46:32 UTC 2005


one of the reasons i was thinking about the 4.2L is that it makes
pretty good power with only 6 cylinders.  granted, 4.2 liters is
pretty hefty still, but 275hp aint too shabby.  that in mind, its not
enough for my 74 nova.  so, i thought to myself, why not turbo it? 
the problem i see with that is the compression.  holy crap, i dont see
how they got away with 10:1 in teh first place, but add some boost and
it doesnt sound good.  so, did they have to port heads, add thicker
head gaskets, change pistons, what?  if the latter, then where would
you find such?  or is it a standard bore that would use pistons from
another engine?  hmm... it would seem taht im getting off the subject
of this list a little, but i woudl also need to know how the ecm would
have to be changed to accomodate boost.




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