2010 8.1 marine engine 420 hp@5000rpm and 503 lb/ft@4000rpm.
http://www.gm.com/experience/technology/gmpowertrain/engines/specialized/marine/2010_8100_HP_Marine.pdf

peace
Hog



Last edited by Hog on Sat Jan 09, 2010 6:17 pm; edited 1 time in total

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I don't think they make it anymore...

http://www.gm.com/experience/technology/gmpowertrain/engines/specialized/marine/Marine_Engines.pdf

The link works now, I had it messed up a bit.

I have also discovered that the 525hp HP3 8100 crate that was stillborn used a specific cast aluminum intake manifold.

peace
Hog

Ok I briefly read through this and saw alot of things about hacking frames an size of an 8.1l maybe this has been covered but here's te info I've gotten.

8.1l bolts into a chevy like any other GM engine there are two sets of motor mount castings and one of which matches a small block. The block is from what I have heard identical to a 502/454 the heads are specific to an 8.1l.

Now the fool from wyotech that hacked the frame to make it fit used the stock headers? Why? Aftermarket 454 headers fit with no clearence issues according to my research.
On top of this the fool didn't do his research and find out that the accessory drive setup off of a kodiak or any other 4500 series truck with and 8.1l will fit no problems NO FRAME HACKING it ticked me off even reading it.

02 is the last year they offered the manual throttle body, you cane use any LS throttle body 80mm and up
a four core radiator is fine for cooling and a bigblock crossmember offered from Offroad Design will clear. The oil pan is very close to the same size of a 454
as far as computers from what I read the 0411 comp is the one to go with from the 02


I searched far and wide to come up with this info and figured I would start spreading it around cause it is correct. I'm a few weeks away from installing an 8.1l/4l80e/203/205 doubler setup in my 1990 blazer hope this helps all the guys cluttering up the Internet asking about size, wondering about coolant issues and so on and the fools running stock suburban brackets that won't fit. The accessory brackets are about 150-200 bucks a piece from chevy.

I joined this forumn just to let you guys know some proper info as far as the wiring good luck i'm running a stand alone engine transmission harness and running aftermarket gauges. Harness is coming from Howell engine developement cause Street and Performance is a total rip off...And I'm spent

502 is different than a 454 - but they both drop in, no issues - so, if an 8.1 is like a 502 - should be easy.

why would anybody hack the frame for an engine swap is beyond me, i also heard them doing it with Ls1 swaps - just dumb.

Not preferrable no, but in some cases... on the S10 trucks the frame had to be boxed in on the right front to allow an AC compressor which bolts low, and the center crossmember has to be modded as well. Either that, or you have to use a Hummer oilpan. I see no reason why a full size would need to be modded since they came with big blocks.

The Gen-VII block is pretty different from the Gen-VI block used for the Vortec 454 (L29) and 502 crate engines.

First of all, the head bolt pattern on Gen-VII blocks is different. There's also provisions for the rear crank position sensor.
The biggest difference is that the 8100 block has a "tall" deck. That means 10.2" deck, not the usual 9.8" deck of the "short" deck 454 and 502 Gen-VI blocks. That alone moves the headers horizontally outward about a quarter inch and up another quarter inch.
Some of the other parts interchange. The 8100 exhaust manifold bolt pattern is identical to the Gen-VI and classic BBC heads. The intake ports on 8100s are symmetrical, not paired like classic BBC heads. They are somewhat cathedral-shaped like an LS1, created in an era where GM thought tall skinny ports were better.
The 8100 does have the advantage of having the extra 2 head bolts per side where all other conventional non-race BBC engines appear to be "missing" them.

NOW... all that being said...
1. The passenger side stock manifold of a L29 hits the passenger side rear upper A-arm mount of C1500 frames.
2. The stock big block manifolds clear a C1500 frame where the donut flanges are if it's a short deck BBC and non-raised exhaust port heads (stock).
3. A tall deck block used with standard port heads (like the 8100) would probably also clear the frame, but it's close already. I cannot say for sure it would work out with no frame modifications.
4. A tall deck block used with raised-port performance heads has no chance of clearing the frame or steering shaft without mods!

I did know the tall deck reference and that it's slightly larger. I was trying to quickly list everything I knew off the top of my head and couldn't remember the size difference...and from what I was told the bottom end will work with 454/502 heads allowing for a vast aftermarket. But I am not certain on that. The guys that built the "Dragalanche" have a turbo on one and the guys at both Howell Engine developement, Novak engineering and Steve Watson of ORD have all been a huge help in this although Novak offers no parts to help my build he pulled up some exploded views of te 4l80e to help determine how to adapt it to the np203 and emailed me a bunch of pics, going able and beyond just to help out which is rare these days and very appreciated.

The reason for my post is because everyone seems terrified to use these engines because of the fool from wyotech usin the wrong accessory brackets. As far as what I read in his write up he trimmed the edges of the frame to clear the heat shields on the factory 8.1l headers.. I have read in different write ups that guys have run both stock 454 headers and aftermarket headers but none have specifically mentioned what they used... Honestly from te lack of info and mis information floating around I'll be making a facebook page for the build and will also be making a website with a parts list with prices and enough pics to make you sick to your stomach. Also if anyone has 8.1L parts I need a few things so drop me a line.

Oh and to address the s10 frame hacking for the a/c compressor..YOU ARE USING THE WRONG BRACKETS!! This is what I'm trying to say the accessory drive brackets off a kodiak, bus, or 4500/5500 mounts the a/c compressor high on the driver side and swaps the alternator to the pass side instead of keeping it where the newer style suburbans/avalanches/tahoes place it ac low to the pass side alternator high on driver... Chevy sells the CORRECT brackets for about 250-300 bucks, well worth it so you don't hack your frame. Now there may be other clearence issues on an s10 where you may have to mod the frame but that is not one. Cause that is the same reason the guy from wyotech did it and it just dumb cause they didn't do thier research. And who needs an 8.1l in an s10? I thought I was being power hungry putting it in a two door fullsize... I'd like to see that s10 do wheelies!

In 2002 GM used to make these 8.1's, and the K2500's were stouter to boot. Better for towing. Very fast unhitched.
Yellow ones are scarce.

My comments were addressing another comment in this thread on using Gen 3+ engines in the S10s, not a big block. The folks with big block S10s have problems with them hooking up and sometimes cooling issues, but they usually don't have bracketry problems. LSx truck engines mount the AC compressor low which is why the frames get modded, the alternative is to use Camaro bracketry which is a lot more expensive than getting the frame cut and boxed. Properly done, there's nothing wrong with modding the frame to make a swap happen.



Last edited by Speeder on Sat Feb 06, 2010 8:22 am; edited 1 time in total

Quote:

YOU ARE USING THE WRONG BRACKETS!!

Yeah Jim...cut that shit out.

Quote:

enough pics to make you sick to your stomach

Whoa....that's MY job. Lol!

[quote="hquick"]

Quote:

YOU ARE USING THE WRONG BRACKETS!!

Yeah Jim...cut that shit out.

Ya know Howard, when you're right you're right. I thought about it, removed the less than positive part of the post. Just the facts, Ma'am.

Did Joe ever REALLY say that? Been watching for the last 6 months, not heard it yet...

Well I didn't mean to be offensive, but I was refering to the bigblock application. And honestly unless you are doing the work yourself. Getting a truck towed to the shop, having someone weld it and box it and then having to rely on them doing it properly would be more expensive then buying factory backets. and it also depends on your idea of expensive... If I had the money to put an LS motor in my s10 I'd hope I'd have enough money to do it right. I was amazed how cheap the brackets were from the factory.

And my comment still stands at you are using the wrong bracket if there is one available and you don't use it. I just see redesigning a frame as alot more time consuming and in my case time is money. If it takes a day to build it, test fit it and get it done I'd rather order a part and spend less time on my back. And then rest assured that my frame would hold up to the abuse. Personally my welding is not upto par. And again this is only my opinion.

Back to the 8.1L I think I'm gonna go the route of aftermarket headers for the K-series truck.

BTW this post is getting more informative as the days go on. Sorry if I stepped on toes but this backet thing had me bashing my head into the wall. If you read his build he has to get custom ac lines made and the whole nine just because he didn't do some simple research... It's just going around your ass to get to your elbow. And on top of this it's coming from an instructor... someone who should know better.

i dont think anybody took offense to it.........

just for the record - if anybody wants to drop something off at my house and cut the crap out of there frame - it better be to put a big ass V12 Detroit or Cat in an S-10

I'm glad there is some good tech info flowing in this thread...

I ended up trading the 97 in on an 01 Sierra...They offered me 4k on a 200k mile trade in, so I couldn't say no.

That said, I am in the process of finding an GMT400 project truck (hopefully one that needs a motor tranny) for cheap, because I still really want to do this swap.

I am almost certain, BBC block hugger headers will work very well for this, but I can't confirm.

If anyone knows of a cheap GMT400 around Kansas City, let me know

blackpearl wrote:

I'm glad there is some good tech info flowing in this thread...

I ended up trading the 97 in on an 01 Sierra...They offered me 4k on a 200k mile trade in, so I couldn't say no.

That said, I am in the process of finding an GMT400 project truck (hopefully one that needs a motor tranny) for cheap, because I still really want to do this swap.

I am almost certain, BBC block hugger headers will work very well for this, but I can't confirm.

If anyone knows of a cheap GMT400 around Kansas City, let me know

far as i know, block huggers will not fit, think they hit the crossmember, but if it were me, i would order a weld up kit and make my own. dont have to worry about length being equal, only a couple hp is given up, they have proven it time and again, so a little DIY will go a long way with custom headers, then you know they fit.

I found this write up at hotrodlane.com, for an 88 but good info and part numbers.

http://www.hotrodlane.cc/Streetstories/81%20swap.pdf

Nice Find RStahoe99