One HOT 350 - We're Still Not Done Either

Discussion in 'Small Block Tech' started by TABuickMike, Feb 8, 2010.

  1. TABuickMike

    TABuickMike Michael Tomaszewski Jr

    Michael Tomaszewski's 350 Buick Engine Build

    Engine: Cast Iron 350 Buick, '68-'70* with oil modifications
    Bore: 3.840
    Stroke: 3.850
    Bore/Stroke Ratio: 1.002
    Displacement: 356.70 ci

    Cylinder Vol: 730.8cc
    Chamber Vol: 57.5cc
    Deck Vol: 4.0cc
    Gasket Vol: 7.9cc
    Dish Vol: 11cc
    Total Chamber Vol: 81.3cc
    Compression Ratio: 9.99:1

    Piston Type: .040 custom lightweight JE Pistons, notched
    Valve Notch Depth: .160
    Compression Distance: 1.890
    Skirt Clearance: .0045
    Piston Weight:

    Deck Height: 10.211
    Piston to Deck: .021
    Ring Land Diameter: 3.803
    Piston Deck to To Ring: .250
    Gasket Bore & Thickness:
    3.89 / .045
    Pin Length & Diameter: 2.500 / .940

    Connecting Rod: Stock Cast Iron, Polished and Lightened
    Rod Type: Cap Screw
    Rod Length: 6.375
    Rod Weight: Before: 660 grams After: 613 grams

    Cylinder Heads: Cast Iron 350 Buick, '68-'70*
    Intake Valves: 1.92
    Exhaust Valves: 1.55
    - Intake Flow ---- Exhasut Flow
    .050 50.6cfm ___ .050 33.2cfm
    .100 83.2cfm ___ .100 55.8cfm
    .200 148.5cfm __ .200 104.7cfm
    .300 198.7cfm __ .300 134.1cfm
    .400 233.0cfm __ .400 149.7cfm
    .450 241.4cfm __ .450 151.3cfm
    .500 248.0cfm __ .500 151.3cfm
    .550 253.9cfm __ .550 152.0cfm
    .600 255.1cfm __ .600 ---------
    .650 259.9cfm __ .650 ---------

    Note: The intake ports have been further ported sine they were last flowed (the above numbers) and the exhaust ports haven't been ported at all yet, so the numbers will eventually be higher.

    Valve Covers: Red TA Performance 350 Cast Aluminum
    Rockers: TA Performance Aluminum 1.65 Ratio

    Camshaft: TA Performance 350 Hydraulic Roller
    Centerline: 113/113
    Duration @ .050: 231/231
    Duration @ .200: 151.4/151.4
    Max Lobe Lift: .365
    Gross Valve Lift: .602

    Headers: TA Performance 2.5" Full Length Chrome

    Intake: TA Performance Aluminum Stage 1 350 Intake Manifold
    Carburetor: 750cfm Quadrajet

    Ignition:
    Stock Distributor w/Pertronix III Module & Coil
    Timing Cover:
    350 Buick Timing Cover from TA Performance
    Water Pump: TA Performance High Performance 350
    Miscellaneous: TA Performance Thermostat housing, all TA Performance bearings

    *Block and Head Dates are unknown so we guess between these years

    We have a software dyno that is surprisingly very very accurate from past engines that we calculated and were then dynoed, one that we know of was exact.

    I ran the program with the above parameters except with full exhaust, a clutch fan and 91 octane:

    RPM --- HP --- Trq
    3000 __ 214 __ 374
    3250 __ 233 __ 376
    3500 __ 255 __ 382
    3750 __ 292 __ 409
    4000 __ 320 __ 421
    4250 __ 345 __ 426
    4500 __ 373 __ 435
    4750 __ 393 __ 434
    5000 __ 400 __ 421
    5250 __ 410 __ 410
    5500 __ 417 __ 398
    5750 __ 417 __ 381
    6000 __ 417 __ 364
    6250 __ 410 __ 344

    Bumping Compression to 10.5:1 Results in Peak HP/Trq: 423@5500rpm/441@4500rpm

    Now changing the Carb to a 950cfm:

    RPM --- HP --- Trq
    3000 __ 213 __ 373
    3250 __ 234 __ 378
    3500 __ 258 __ 387
    3750 __ 296 __ 415
    4000 __ 329 __ 431
    4250 __ 357 __ 441
    4500 __ 386 __ 450
    4750 __ 403 __ 446
    5000 __ 412 __ 433
    5250 __ 423 __ 423
    5500 __ 430 __ 410
    5750 __ 428 __ 391
    6000 __ 426 __ 373
    6250 __ 416 __ 350

    Bumping Compression to 10.5:1 Results in Peak HP/Trq: 436@5500rpm/456@4500rpm

    Now with a Single Plane and a 750cfm

    RPM --- HP --- Trq
    3000 __ 198 __ 346
    3250 __ 217 __ 351
    3500 __ 243 __ 364
    3750 __ 282 __ 395
    4000 __ 316 __ 415
    4250 __ 347 __ 429
    4500 __ 384 __ 448
    4750 __ 409 __ 452
    5000 __ 419 __ 440
    5250 __ 432 __ 432
    5500 __ 443 __ 423
    5750 __ 445 __ 406
    6000 __ 440 __ 385
    6250 __ 430 __ 361

    Bumping Compression to 10.5:1 Results in Peak HP/Trq: 452@5750rpm/457@4750

    Now with a Single Plane and a 950cfm

    RPM --- HP --- Trq
    3000 __ 196 __ 343
    3250 __ 216 __ 348
    3500 __ 242 __ 363
    3750 __ 282 __ 395
    4000 __ 320 __ 420
    4250 __ 351 __ 434
    4500 __ 390 __ 455
    4750 __ 414 __ 458
    5000 __ 424 __ 446
    5250 __ 442 __ 442
    5500 __ 450 __ 430
    5750 __ 453 __ 414
    6000 __ 451 __ 395
    6250 __ 440 __ 370

    Bumping Compression to 10.5:1 Results in Peak HP/Trq: 460@5750rpm/463@4750

    As for the whole increasing carb cfm and the power numbers jumping, I dont know what to think of it because I can make it 1200cfm and the numbers still climb.

    Not too shabby for a little 350 that still has a little bit more potential in it :beers2:
     
    Last edited: Feb 9, 2010
  2. 71skylark3504v

    71skylark3504v Goin' Fast In Luxury!

    I'm lovin' it! :TU:
     
  3. WickedWay

    WickedWay Got Torque?

    Any shaving / decking done to the heads or block?
     
  4. Mark Demko

    Mark Demko Well-Known Member

    Nice:TU:
     
  5. sean Buick 76

    sean Buick 76 Buick Nut Staff Member

  6. sean Buick 76

    sean Buick 76 Buick Nut Staff Member

    What are your valve sizes?
     
  7. ubushaus

    ubushaus Gold Level Contributor

    Sounds great!

    OK, so I need a bit of schooling on "Polished and Highly Lightened Stock Capscrew Connecting Rods". Can someone describe the process and benefits?
     
  8. David G

    David G de-modded....

    Sweet! :TU:
     
  9. CraigFaller

    CraigFaller Well-Known Member

    Hey Mike, great sounding build. Alot of guys will be following this with great interest! Keep representing the 350! :beers2:
     
  10. SpecialWagon65

    SpecialWagon65 Ted Nagel

    Do you have a picture of it? :laugh:
     
  11. TABuickMike

    TABuickMike Michael Tomaszewski Jr

    Yes, I dont have numbers atm but I'll add them to my first post.

    1.92 intake and 1.55 exhaust

    We ground a lot of material off around the small pin end and took a lot off of the caps, by doing so this decreases the weight of the rod and thus equates to a lighter rotating assembly which should help make a little more power, less weight the engine has to move to rev. Once we did that I polished the sides of the beams, oil runs off of them better and it reduces any stress risers or removes any microscopic cracks to "strengthen" the rods (not really but materially it technically does). That and they look really pretty too :Brow:

    Engine isn't built yet, heads still aren't done but I can take and post pictures of everything before the build starts too.
     
  12. ubushaus

    ubushaus Gold Level Contributor

    That would be great! Thanks Mike!
     
  13. Dan Healey

    Dan Healey Well-Known Member

    Now IF you were actually testing aluminum heads & SP-350 on the dyno, you would have great interest.:Brow:
     
  14. Matt S

    Matt S Matt

    Sound great! Now just to keep this all in perspective, what kind of money would we looking at to have this done to our motors?

    Thanks
    Matt
     
  15. exfarmer

    exfarmer Well-Known Member

    Super Mike! Thats exactly the type of build I would like to do. I was hoping for ~375 hp & torque. If I can get over 400 that would be great! You should be done about the time I'm ready to start, I'll fallow this with interest. I'm sure there are a lot of us that can afford to do a build like this but wouldn't even consider spending money on aluminum heads even if they were available.
     
  16. rex362

    rex362 paint clear and drive

    Great #'s there :TU:

    even if they were 5%-10% lower they are great #'s for a treefitty
     
  17. bignastyGS

    bignastyGS Maggot pilot

    Till I see some ET's at the track..I call BS....LOL
     
  18. 71skylark3504v

    71skylark3504v Goin' Fast In Luxury!

    What's the biggest grind you can put on one of these hydraulic rollers?
     
  19. Steve Craig

    Steve Craig Gold Level Contributor

    If you need another platform to experiment/fine tune your build please tell me.
    I can have the car on a transport in about 30 minutes.
     
  20. CraigFaller

    CraigFaller Well-Known Member

    Hey Mike, quick question on the rockers... what lift would you start to worry about clearance with a 10:1 piston without valve reliefs? I've been eyeing up a set for myself.
     

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