OK fer the fellow psychotic gearheads out there....
on the rear 90 3800 LN3 engine in the twin engine 94 Olds Cutlass 442 (ordered the Jegs 10pt cage a few days ago... backorder)
has anyone tried to swap the later SII heads onto a LN3 vin C before?
They seem to have the same bolt pattern, but diff accesory mounts-no big deal there rear engine has crank, WP, alt, and tensioner only
the series II heads also having the factory roller rockers and smaller bolt retainers, better ports etc.
I see two things that have to be acounted for, the 90 LN3 block has a taller deck height which with using the series II Lwr intake manifold will require spacers, this is also an easy fix as I have acces to a bridgport mill and alum stock of varrying thickness' and tap for bolting to intake with paper gaskets and flush head screws.
the cam lifters are hydraulic roller for both engines but the series II has shorter pushrods for the lwr deck height, there is a possibility the stock LN3 pushrods will work but custom length pushrods arent too bad....
Now the 3800 WILL be getting Turbocharged at some point maybe this winter and get a MegaSquirt EFI setup (90 non PCM controlled trans....) and we have already swapped to the delco ignition. and there are plans for an intercooler.
I see several bennefits from doing something like this, factory roller rockers, less friction. symetrical, port and chamber design with bigger better flowing valves. and better exhaust manifolds for us toi turn into turbo headers.
not I have another idea that goes along with this, if I get the supercharged 3800 L67 heads with the injectors in the head and use the NA intake I can run 12 injectors that will help deliver the extra fuel required the MS EFI can be programmed for this (batch or new sequential) and delay/shutoff the second set of inj for better idle and proper mixture at WOT full boost. we have peak and hold (low impedance) type Quad 4 injectors that will flow 30lbs each at 50psi (boost refrenced/rising rate) and 12 would more than handle the fuel requirments
a fabricated Upper intake manifold is not out of the question with me, I have access to a TIG welder and have an alum mig so I can mockup and do final welding, and because there might just be a better TB / location and from the look of things I can make the roller rockers a different ratio with the bridgport and a 300 amp TIG welder.
Just curious if anyone knows if this has been try'd, Al and I'* next run to the Upick a part I will be doing some "research" with a 90 LN3 and a 96 NA/SC, and if everything checks out we will be going home with the parts....
we are still looking for a front 3800 drivetrain but we have the rear 3800 to play with fer now... let me get some feedback... Dr Jay, Wilwren