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  1. #1
    Join Date
    Dec 2002
    Location
    Montreal, Quebec
    Posts
    1,609

    Default L67 3800 II RWD retrofit?

    Does anybody know of anyone who has stuck a supercharged, L67 3800 II Buick V6 into a RWD application? Are there bell-housing adapters to mate these engines to a RWD tranny? Flexplates? Converters?

    Just thinking outside of the box, here. I've been behind the wheel of two before, and they seem like a great engine. It'd just be neat if there was more versatility to them outside of the FWD platform.
    Glen Robins
    BPG #1857
    '80 LeSabre: '70 350-4, 8.5" with 3.42s
    - built and formerly owned by Floydsbuick
    "All your pretty chrome and paint means nothing if you're watching a pair of shrinking taillights from a primered big-block Vega." -- Jake Amatisto

  2. #2
    Join Date
    Feb 2002
    Location
    Oakland Gardens, N.Y.
    Posts
    21,526

    Default Re: L67 3800 II RWD retrofit?

    Didn't the Firebird/Camaro use the 3800 at some point in the 80's? I would look in the boneyards and start there.
    Larry
    1998 "Fully Optioned" SC3800 Riviera
    70 GS 455 Stage1, TSP 470, 602 HP@ 5900, 589 TQ @ 4900
    TA Hyd Roller Cam, 230*/238*, 112, .544"/.577" lift, 4-7 swap
    MSD Digital 6+, Ignitionman Distributor w/MSD trigger
    1967 BT Switchpitch ST-400, Gear Vendors OD
    with TSP 3200/1800 converter
    AED 1000 HO Carb, 800 CFM 7042240 Quadrajet
    8.5 10 bolt, 3.73's
    11.67 @ 115.49 MPH
    Larrymta@verizon.net, GSCA #291
    BPG # 1063
    N.E. GS/GN Club Assistant Director

  3. #3
    Join Date
    Feb 2002
    Location
    ND
    Posts
    17,102

    Default Re: L67 3800 II RWD retrofit?

    I thought some of the later, 90's, F bodies got a RWD version of the L67?
    1968 GS350
    1998 Riviera

  4. #4
    Join Date
    Feb 2002
    Location
    Twin Cities, MN
    Posts
    6,435

    Default Re: L67 3800 II RWD retrofit?

    I thought I saw a thread not long ago on 3800pro.com on this same subject.
    http://www.3800pro.com/forum/
    Dale

    Current Buicks...None. :-(
    Past Buicks. '66 Riv / '70 Rivs (2) / '90 Riv / '72 Skylark / '72 LeSabre / '72 Electra / '96 LeSabre / '92 Park Ave. / '96 Riviera.

    "The guy who invented the first wheel was an idiot. The guy who invented the other three, he was a genius.". Sid Caesar

  5. #5
    Join Date
    Feb 2002
    Location
    ND
    Posts
    17,102

    Default Re: L67 3800 II RWD retrofit?

    Type L67 swap in a Google search, plenty of info out there.
    1968 GS350
    1998 Riviera

  6. #6
    Join Date
    Dec 2002
    Location
    Clarion, PA
    Posts
    2,202

    Default Re: L67 3800 II RWD retrofit?

    I've always thought the Series II had provisions for the front and rear wheel drive applications. I know the Series III is FWD only. I don't think you'll be able to use the supercharger from a FWD car since the inlet comes from the back of the motor (tranny side). You would have some firewall clearance issues. Looking at my 99 Regal GS, I don't really see a way to change the inlet to anywhere else on the supercharger. You'd have to do some fancy pipe work and make a few holes in the firewall. Or you could buy a new aftermarket one. However, there are kits available to turbo charge the Series II. That might seem a little more feasible since it probably cost the same and you can make more HP than a supercharger kit. The tranny bellhousing is your basic small GM motor one (90 degree or something like that). So if you find a 700r4 from a small 6 cylinder (2.8 or something) you could make it work. If it were me I'd find a cracked up F-body and take the whole drivetrain and computer and swap it in. Then work from there.
    BPG #1252
    GSCA #3523
    '70 GS 350
    '71 Skylark 455 (future parts car)
    '86 T-Type (sold)
    '01 Regal GS (blew the tranny and traded it for an SUV)
    '99 Regal GS (its back again)

    I'll be where I am.

  7. #7
    Join Date
    Jan 2003
    Location
    Stacy, Minnesota
    Posts
    856

    Default Re: L67 3800 II RWD retrofit?

    This is on another post also, but the F bodies from 1996-2002 used the series 2 3800 with a 4le60 trans. I am going to mock up this combo in a 1970 Skylark convertible body this winter. I picked up a rolled over Regal GS with the supercharged motor and a 1998 Firebird with the 3800. The plan is to get it running with the Non-Supercharged series 2 then switch over if the orientation proves to be a solvable concern.

    My theory is not performance minded in the least. My neighbor's 2000 Lesabre gets 28 mpg and the series 1 in the 92 Regal gets 26 mpg regularly.

    The weight of the 2000 Lesabre is about 3600lbs. I will find a way to get a non-AC 70 Skylark ragtop to that weight. I have averaged several sources to come to a figure of 18% loss of HP for a RWD trans vs 14% loss for a FWD transaxle so I would have to find a way to either reduce weight further or boost power to make up for that 4% difference, but still guess that the combo should be good for 25+ mpg. The weight of the engine itself is less than the 350 2 bbl. but the Trans weighs 20 pounds more? The old combo was good for 16mpg pretty regularly.

    I want a modern fuel injection drivetrain in a classic skylark ragtop that gets 25+ mpg. I am used to driving a V-6 now and like the power and mileage of the 3800. And they are cheap and all over. I looked at an LS derivitave V-8 swap but its too spendy and will be around a 20 mpg vehicle. I have a grand total of $600 in both donor 3800 vehicles of which I will be able to sell off a bunch of parts along the way to make some of my dough back.

    I will have pics up this winter as I get this up and rolling.
    Chris "too many projects" Paape

    1971 GS Stage 1 convertible(in resto, 3rd time)
    1970 GS Stage 1 convertible(Rough)
    1969 GS 400 4speed Convertible(Rougher)
    1971 GS 350 Coupe(my summer driver)
    1971 GS 455 Coupe
    2009 Ford Focus
    1999 Chevy Tahoe

  8. #8
    Join Date
    Jul 2007
    Location
    Greensboro, nc
    Posts
    3,872

    Default Re: L67 3800 II RWD retrofit?

    I routinely got 30+ mpg highway in my SC'd 97 Park Ave. With the mods it had I was making well over 300 HP. All with simple bolt on stuff. What a great engine. Almost like a 350 with two less cylinders . That thing would rip...
    Jay Davenport
    72 GS 355.. FOR SALE
    71 Skylark 355 Mark Burton Twin Turbo 7.67@ 92.1 W/2.01 60ft Ecoboosted SOLD

    If you don't expect too much from me, you might not be let down..

  9. #9
    Join Date
    Mar 2003
    Location
    Chattanooga,TN
    Posts
    381

    Default Re: L67 3800 II RWD retrofit?

    Jon Harden
    Chattanooga,TN

    64 Wildcat convertible Marlin Blue

  10. #10
    Join Date
    Dec 2002
    Location
    Montreal, Quebec
    Posts
    1,609

    Default Re: L67 3800 II RWD retrofit?

    Chris, I've thought the same thing -- I'd like to have a modern EFI setup in an older RWD platform that gets respectable mileage, but can still play the stoplight to stoplight game. The L67 seems to make sense because it is a proven engine, and they're practically a dime a dozen. Keep us updated with your swap.

    Joe, I like the turbo idea, too. Theoretically, it would seem that twins would make good power, solve the inlet/firewall problem, and be relatively inexpensive too, if one were to go the junkyard route. A Megasquirt management system might be the ticket for something like that?

    I'm thinking like this because of the sucky mileage I'm getting with my LeSabre. It's a totally fun combo, and the giggles/gallon ratio is high, but it sure wasn't made for a poor college student.

    Thanks for the links and info, everyone!
    Glen Robins
    BPG #1857
    '80 LeSabre: '70 350-4, 8.5" with 3.42s
    - built and formerly owned by Floydsbuick
    "All your pretty chrome and paint means nothing if you're watching a pair of shrinking taillights from a primered big-block Vega." -- Jake Amatisto

 

 

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