Swapping series II heads onto EV6/LN3/SI tall deck shortblok - Page 5 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 11-20-2005, 10:32 PM   #41
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Originally Posted by Turbocharged400sbc

http://www.supersixmotorsports.com/

looks like they copied fords split port 3800 design....
now that would be a B**** to widen....
I just checked out the catalog. That pic is still for the ford. The 3800 UIM/LIM is below that.
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Old 11-20-2005, 10:34 PM   #42
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Originally Posted by 95naSTA


Something to drool over ...until I hear how much one of those beast'* cost'*.
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Old 11-21-2005, 08:57 AM   #43
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I'd need to do some work on the hood to get it to fit. (Runs for hammer)
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Old 11-21-2005, 01:40 PM   #44
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Quote:
Originally Posted by willwren
I'm missing the whole point of this hybrid. Seriously, I could put an LS6 in a motorcycle, but why would you?

In this particular case, you're mixing Series 1 and Series 2 parts for very little gain over just doing a full swap to begin with.
Because an LS6/LS7 motorcycle would be suicidely fast and sooo much fun

i get this alot i wont deny it....but its the same thing that racers used to put "double hump heads onto a sbc...slightly better all in the name of power...this is more involved but it has two benefits...taller deck height and longer rods...that means that if i get around to seeing how long of rods i can fit in there with a short compression height piston (still need to pul a rod to check comp height of the SII pistons (and aftermarket prices)
and get rods with honda rod journal size (1.9 inches-nascar has been using 1.9 rod journals for a whiile now) and be able to ofset grind the crank for more stroke (may not do this)
with long rods the piston dwels at TDC longer and has less piston thrust loading...all good stuff...when you remove friction...power increases


plus i would like to test this grand national 3800 head (its still assembled in the basement)on here and see if its posible that with work aftermarket ALUMINUM GN 3800 heads may work with the SI/SII 3800...i think alot of people would like to know it that can be made to work and with how much effort is required (custom intake etc.)

oh and because no one'* done it before, and me and a guy in Australia are the only one'* (that i know of) ive found working on this....

i fixed that post and posted a link to the cataloge .pdf

Regards, James
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Old 12-02-2005, 07:51 PM   #45
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[quote="OLBlueEyesBonne"]
Quote:
Originally Posted by 95naSTA


first off that is the most bitchin intake i have ever seen detail it in red and put it in a 355 rebodie fiero

I've thought about this a few times in my fiero after seeing the head gaskets.As for why I like the torque of the s1 because i have an aluminum flywheel but i don't like the way it craps out at 3500.
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Old 12-05-2005, 02:32 PM   #46
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Quote:
Originally Posted by markviiisvt4
.... i don't like the way it craps out at 3500.
This is one reason i want to put the better engineered symetrical port SII heads on the SI (tall deck/long rod) Short block...the best of both worlds...

That and the "never been done before" factor

I would love to check out the differences between the 3.8L GN bolt pattern and the 3800

http://www.championgn1.com/gn1/produ...mcylinder.html

i'm sure that if it only took minor reworking people would kill for these...
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Old 12-26-2005, 09:06 PM   #47
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OK back on the subject...here we go...
the SII cover on the left and the SI cover is on the right...essentially the covers are the same but Al'* fingers are pointing to the major difference...the SII cover has one bolt hole deleted and the other moved...
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by now you have rfigured that the cleaner piece is the SII cover...the filthy one the SI unit...here are the two oil filter mount units...both are interchangable between covers (W body unit on the filthy SI cover.)
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here is a side by side view of the SII and SI covers near the oil filter adapter mountings here also you can see the (minor) differences between the two units
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here are the fronts of the covers...you can see that the cam sensors are in the same spots as well as the small differences between the two water pumps...and the same mounting points for the crank sensors between the two covers.
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Here you can see the identical oil pump assemblies...the SI cover pump driven by two flats on the crank gear...and the SII unit driven by 6 splines, the pumps are identical otherwise...
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here is a crappy shot of the SII deck height measurment/timing chain area
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and here is Al in front of the 442 and his V8 S10
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and a quick shot of the drivers cockpit

and here is the empty engine compartment of the (formerly) 4wd S10 Blazer...That is getting a 400cid SBC
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Old 03-11-2006, 12:50 PM   #48
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Update!

i have a set of 00 impalla heads and misc pieces (w body SII rear manifold LIM etc) and have done a prelim mockup...boy does it look good it looks like 8 of the pushrods (SI, the SII are way to short by the same amount the SII deck was shortened) are able to preload the lifters to spec 2 more pushrods will be close and the last two may need a little more length for proper lifter preload, also it looks like i need to grind the pushrod passthrough holes for those 4 oddball pushrods but thankfully this engine doesnt use guidplates etc and has pedestal mount rockers that makes my job easier

i'll tell you this much...it sure is lonely from here on out as i am now at the point that Locksmiff stopped his to persue other work...

one cool thing i have found is that the smaller cam journal blocks (SI and supposedly 95-96 SII) can be turned into roller cam bearing by some small cam tunnel machining and just a hair off the cam journals to fit and use the "off the shelf" roller bearings i found...dont know about the large journal SII stuff but it is an interesting way to further reduce cam bearing friction as well as (with restricters) making sure the bottom end gets all the oil it needs as the roller cam bearings will require less oil. yes i have been looking at alot of ways to make a better "mouse trap" lol, including minimizing windage to free up more power...

I guess thats the majority of the update...James
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Old 03-11-2006, 01:05 PM   #49
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You're very smart, and insane, I love it
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Old 03-13-2006, 12:48 AM   #50
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Quote:
Originally Posted by LakevilleSSEi
You're very smart, and insane, I love it
when i have these new pics setup and posted I def wont seem as insane as way back when i started this project....

lets put it this way...if your planning on putting a cam in your SI 3800 and porting your heads...you could swap on a SII top end and get even more power
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