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  1. #1
    Join Date
    Sep 2006
    Location
    Pontiac, MI
    Posts
    836

    Default 400 HP Buick 350?

    I'm ashamed to say that in my 7 years of wrenching on customers cars, the closest I've ever been to rebuilding a motor was tearing down a Chevy 350 for a friend.. Now that I've got a little more money available, I'm wanting to take my 70 Skylark and turn it from a stock daily driver into a street beast. So...

    I'd like find out if anyone has any tech specs to make a 400ish horsepower Buick 350? At the moment I have a stock 350-2 barrel motor, which I believe to be the origional. Was disappointed to find out there isnt any stroker kits available for this motor, so I thought I'd ask someone who's toyed with one or more of these.

    To start with, I'll be having it bored .030 over, and adding a HEI distributor. If I can find it, a direct inject fuel injection unit.. Any suggestions on a cam, the heads, or anything else?
    Last edited by WickedWay; 09-28-2006 at 11:26 AM. Reason: Spelling error
    Richard Herrmann

    B.C.C. Total Performance
    550 Cesar E. Chavez
    Pontiac, MI 48342
    Welding & Fabrication, Autobody repair & paint, OE Repair & Aftermarket performance

  2. #2
    Join Date
    Feb 2002
    Location
    HUTTO, TX
    Posts
    4,164

    Default

    Jim Burek Just finished up my 449hp 350.

    The most need Item on these motor in my oppinion is head work. (only option OEM Iron Heads)

    My Motor is 9.6 to 1 compression with ported heads and an 850 demon carb. The Power can be made pretty easily. I need to emphasis The power is in the heads.


    Noticed your also a Texan
    Phil Green
    72 GS350 449hp 447tq , 390 gears, and 200 4r
    1981 RX7 with 5.3L LS (Project)

  3. #3
    Join Date
    Oct 2003
    Location
    N.W. Arkansas (Razorback Country)
    Posts
    204

    Default

    Buicks have more "metal" to them, so don't be afraid to bore them out....you can get a lot more piston than you can with a Cheby motor.

    The blocks are all pretty much the same as well as the heads between 4bbl and 2bbl
    Check the nhra.com for casting numbers and what the "base" hp for different years.

    There is TA Performance that may offer kits, but I know they have lots of goodies for us poor Buick folks.

    Wayne S
    My Buick is in a Full Size Jeep
    71 J4000 Truck with factory 350/Th400...PICS


    Full Size Jeep site
    International Full Size Jeeps

    "Is that a Cheby 350 in your Jeep?"

  4. #4
    Join Date
    Feb 2002
    Location
    austin,tx
    Posts
    2,934

    Default

    Start by throwing out your ideas about FI and strokers, etc.....you don't need any of that and for that kind of money you can get a good, "regular" motor built.

    Areas you will need to "improve":

    Intake -- Carb and Intake combo--check TA for their aluminum small block offerings...they have what you need

    Cam -- Same thing--talk to TA or like Phil, run one of Poston's grinds...if you use one of the engine builders that are on this board they will have a pretty good idea on cam choices

    Heads -- Already mentioned---that will be key to taking advantage of the other parts mentioned.

    Exhaust-- Headers and a good mandrel bent 2-1/2" system. TA, Hooker,etc sell these.

    You might consider contacting Jim Burek at PAE Enterprises in El Paso (he is on this board) for some ideas.

    Remember--you can get a NEW GM timing cover still for that motor--I think it's the V6 cover and works just fine--in case yours is well worn in the oil pump gear area.

    Once again--no need for anything exotic like alum heads, FI, stroker, etc.
    Check with Jim on cylinder bores---not something you want to randomly specify to an engine builder...just bore it the MINIMUM NEEDED.

    You are looking at a pretty basic buildup...keep it simple.
    Patton Glade Austin, TX

  5. #5
    Join Date
    Jul 2004
    Location
    ct.
    Posts
    2,516

    Default

    FYI, that little 350 can handle more HP without self detructing than a 455BBB. How's 1000+HP sound from a stock block. It can & has been done.
    Tom Telesco
    Classic and Muscle Automotive
    465 Glenbrook Rd
    Stamford, CT 06906-1820
    Day Phone 203-324-6045 ET
    NailHead Mini-Starters '53-'66
    Adjustable Roller Tip Rocker Arms - All NailHeads

    "If I can't get it, you don't need it!"

  6. #6
    Join Date
    Feb 2002
    Location
    Baltimore, Maryland
    Posts
    1,745

    Default 350 Performance

    You should contact Mike T at T/A Performance. His wagon was originally a 350" car running 11's back in the '80's. I'm sure he can guide you thru the parts selection for your desired HP set-up.

    Matt
    '71 GS455 - 434371H 12/70
    '70 Skylark convt. project

    '70 GS 350 4speed - sold
    '70 GS 350 - dead
    '69 Sportwagon 400 - sold
    '68 Sportwagon 400 - sold
    many Skylark - donors

  7. #7
    Join Date
    Sep 2005
    Location
    South Lake Tahoe, CA
    Posts
    1,498

    Default

    you can read this thread: http://www.v8buick.com/showthread.php?t=68183

    and the "it's alive" thread

    '64 Riv

    '65 Special WAGON... turbo and EFI here I come
    http://www.v8buick.com/showthread.ph...ntake-and-more

  8. #8
    Join Date
    Oct 2004
    Location
    Pawleys Island, SC
    Posts
    2,625

    Default

    400 HP SBB is easy. PORT the heads and everything else you can get off the shelf. Here's two combos from my archives...

    350 bored 30 over index ground crank&cross drilled
    Forged pistons w/valve reliefs TA Performance
    Reconditioned rods
    SFI flexplate
    Balanced assembly/ Torque plate used
    TA intake Port matched to heads, exhaust crossover is open
    1 5/8 TA headers
    New valves (stainless) larger heads ported Supposed to be 235 cfm intake 176 on exhaust.
    750 dbl pump holley 70- 78 jets
    1 inch open hole spacer Never experimented enough with 2 inch spacer
    did some but didn't notice much
    new TA front cover
    Oil Pressure 65-70 lbs hot @6000 rpm
    50-55lbs @3000 rpm
    395 hp At 5900 rpm TA510 cam
    370 Tq @ 4000 rpm
    373 rear gear 350 trans 3500 stall
    This gave me the best of 13.66 @100 mph
    this motor was dynoed before iput it in. This was in 1994.
    Today I have the GS club pop Mech. cam Comp Cam Pro Mag Lifters
    These work the best
    now car runs 13.50 to 13.80 did 13.33 as best 2 years ago can'get back.
    good compression 180 -190 leak down was 3-5 percent

    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    9/8/05 quick note here on another little 350 Buick.
    Here's the combo, trw forged pistons, 9.4 to 1 compression, ported heads flowing 263 intake and 190 exhaust, poston 350-112 cam, TA intake, 1000 demon shop carb. it's the 1000 cfm race demon, street version with vac ports. They were around $800.

    Real simple combo, good power.
    It's just touching 400 horsepwoer at 5900 rpm and is in the 430 torque range at around 4400 rpm.
    Holds just under 75 psi at 6100 rpm.
    Nice running engine. Looks to be about 20 horsepower more with the demon than with a 750 edelbrock. Jim BurekP.A.E. ENTERPRISES
    Andy, 1970 Skylark Custom

    Support your country
    Support your neighbors
    Support yourself
    Buy American

  9. #9
    Join Date
    Apr 2006
    Posts
    1,306

    Default

    Or you could just throw turbos on it heh heh.

  10. #10
    Join Date
    Mar 2004
    Location
    Edmonton Alberta
    Posts
    13,481

    Default

    Sonic test after 40 over on a Buick 350. There is no need to stroke it becausse it is already a square motor (close to same stroe as bore). A chevy has a way smaller stroke then bore and needs the extra stroke. 400 hp is easy, just pollish the heads and run a hot cam...
    __________________________________________________ ________________________________________
    My book called Small Block Buick Performance covering the V6, 215, 300, 340, and Buick 350 engines will be released soon.

    http://www.v8buick.com/forumdisplay....rformance-Book
    __________________________________________________ __________________________________________________ _________________________________
    1970 Buick Skylark 350 street/strip with 6 point cage: Custom tube headers feed Twin T3/T4 Turbochargers, Holley 650, sheet metal single plane intake, heavily ported iron heads with oversized valves, mild Poston 114 camshaft (2800-6000 RPM), Diamond forged pistons on Hershe forged rods, balanced, ARP everywhere, dual 3" exhaust, Paddle shifted 4L80E 4 speed overdrive, Moser 12 bolt with 3.42 gear.

  11. #11
    Join Date
    Sep 2005
    Location
    Bethesda, MD
    Posts
    141

    Default How big can it get?

    Quote Originally Posted by PlumCrazy
    Buicks have more "metal" to them, so don't be afraid to bore them out....
    How much can you usually overbore a Buick 350, and does anyone make stroker kits? Thanks.

  12. #12
    Join Date
    Sep 2005
    Location
    South Lake Tahoe, CA
    Posts
    1,498

    Default

    you can't stroke a buick 350... rods are VERY close to the cam as it is... come any closer with stoking it and KABOOM

    '64 Riv

    '65 Special WAGON... turbo and EFI here I come
    http://www.v8buick.com/showthread.ph...ntake-and-more

  13. #13
    Join Date
    Feb 2002
    Location
    Blastfurnace AZ
    Posts
    979

    Default

    The 350 SBB is already stroked and as stated above, you can't go any further.
    Sold the 69. Now working on 68 GS CA.
    I hate bodywork
    Patrick

  14. #14
    Join Date
    Sep 2005
    Location
    Bethesda, MD
    Posts
    141

    Default How big can it get?

    It makes sense that a small, light engine wouldn't have a lot of room for a longer stroke or bigger pistons. So, I take it the extra 5 cubes you'd pick up from an .030 overbore are about all you can get. Thanks.

  15. #15
    Join Date
    Mar 2004
    Posts
    1,161

    Default

    Quote Originally Posted by 70aqua_custom
    400 HP SBB is easy. PORT the heads and everything else you can get off the shelf. Here's two combos from my archives...

    350 bored 30 over index ground crank&cross drilled
    Forged pistons w/valve reliefs TA Performance
    Reconditioned rods
    SFI flexplate
    Balanced assembly/ Torque plate used
    TA intake Port matched to heads, exhaust crossover is open
    1 5/8 TA headers
    New valves (stainless) larger heads ported Supposed to be 235 cfm intake 176 on exhaust.
    750 dbl pump holley 70- 78 jets
    1 inch open hole spacer Never experimented enough with 2 inch spacer
    did some but didn't notice much
    new TA front cover
    Oil Pressure 65-70 lbs hot @6000 rpm
    50-55lbs @3000 rpm
    395 hp At 5900 rpm TA510 cam
    370 Tq @ 4000 rpm
    373 rear gear 350 trans 3500 stall
    This gave me the best of 13.66 @100 mph
    this motor was dynoed before iput it in. This was in 1994.
    Today I have the GS club pop Mech. cam Comp Cam Pro Mag Lifters
    These work the best
    now car runs 13.50 to 13.80 did 13.33 as best 2 years ago can'get back.
    good compression 180 -190 leak down was 3-5 percent

    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    9/8/05 quick note here on another little 350 Buick.
    Here's the combo, trw forged pistons, 9.4 to 1 compression, ported heads flowing 263 intake and 190 exhaust, poston 350-112 cam, TA intake, 1000 demon shop carb. it's the 1000 cfm race demon, street version with vac ports. They were around $800.

    Real simple combo, good power.
    It's just touching 400 horsepwoer at 5900 rpm and is in the 430 torque range at around 4400 rpm.
    Holds just under 75 psi at 6100 rpm.
    Nice running engine. Looks to be about 20 horsepower more with the demon than with a 750 edelbrock. Jim BurekP.A.E. ENTERPRISES
    The first Buick build up belongs to me. I added a 125 shot of Nitrous. Look at my sig you can see some additions. Right now I am making changes to the trans governor then I will try to get to the track. See if I can go faster than 11.81.
    Bu Hogs Rock
    Guy
    355 Buick
    13.50@99 mph motor
    13.31@100 best
    11.81@114 mph 125 shot nitrous
    200-4r trans 3000 stall 373 gears
    H-O Racing suspension

    http://www.streetfire.net/video/1029...time_12508.htm
    With 350 trans 11.87@112, 125 shot nitrous

  16. #16
    Join Date
    Oct 2003
    Location
    Buffalo Gap, TX
    Posts
    3,426

    Default

    I'll second the above comments, especially pglade's.

    Make SURE your oiling is good - good pump, good bearings and good clearances.

    Do some port-matching and bowl-blending on the heads, and POLISH the chambers. Danged detonation-prone open chambers are (imho) the worst part of the Buick 350.

    Get some headers, pick a cam, and go scare people!

    Also, there's lots of free power in tuning a 350 - I posted better times with my 150K mile kinda-tired old '70 GS350-spec engine than several 455-powered cars on this board, and I'm convinced it was mostly due to a good timing curve and a good Q-jet. If you're going HEI, search this board for the weights and center you'll want, and get an adjustable vacuum advance. If you use a Q-jet, send it to somebody like John Osborn and have them calibrate it specifically to your combo.
    James BPG #1604
    Still own my first car: '71 LeSabre - the 2NABOT (formerly the World's 2nd Fastest 350-powered Big Buick) Now 455-powered.
    '62 Ranchero w/ '68 200 Six and Column-shift 3-speed. Cruuuuuise-mobile.

 

 

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