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Tbi motor build....

Discussion in 'The Garage' started by 79k20350, Feb 20, 2006.

  1. 79k20350

    79k20350 3/4 ton status

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    Ive seens a few of these threads but thought id aska few specifics. I need to rebuild the 350 i have right now and am going to go .030 over, cam (nothing to big) some roller rockers, intake (if its worth it) and a set of shorty headers and exhaust ,and a good intake. Off the top of my head just guessing its prolly a 300hp combo, maybe 350 tq? now as for the fuel system, i know these tbis arent exactly power firendly:rolleyes: what should i do as far as fuel system? i need a new throttle body, will one from a 350 be sufficent or should i slap one froma 454 on there? how bout an aftermarket one? also what abbout the pump? think it will be enough. Btw this is going in a 93 and needs to pass emissons, thanks guys!
     
  2. sled_dog

    sled_dog 1 ton status

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    wouldn't eexpect 300HP with just those upgrade. Heads and a cam would help. Have to be careful with cam. I would definetally get a cam though. Call up Comp Cams and Crane Cams and see what they recommend. I just tore apart a TBI 350 2 times because a friend put too large of a camshaft in it.
     
  3. 79k20350

    79k20350 3/4 ton status

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    yeah i wasnt thinking anything big. 200hp is stock right? when rebuilt the heads will get a shave and a 3 angle valve job too... 300 prolly is a bit high i was just shooting from the hip. i dont need a whole lot but if im doing it i might as well get that little bit more.
     
  4. sled_dog

    sled_dog 1 ton status

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    don't really see the need for a shave on the heads. Shaving heads just becomes a pain. Need to shave the intake to match, overall I don't recommend it on something other than a race motor. Personally I'd look at a replacement set of heads and a nice mild cam. That alone would wake up your engine pretty good I'd venture to bet. Say these heads? World Products S/R Torquer
     
  5. 79k20350

    79k20350 3/4 ton status

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    hmm thats got me thinking.... a nice 76cc should give some good torque.... cant find a price liste though
     
  6. sled_dog

    sled_dog 1 ton status

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    you wanted to shave the heads to up compression and think using stock chambered heads would bea g ood choice? I'd gow ith the 64s and up the compression a bit(keeping it in the low to mid 9s).
     
  7. 79k20350

    79k20350 3/4 ton status

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    my heads all over the place tonight, its been a LONG day. the only reason i said shave, might have been using the wrong termanology but just to make sure the heads were flat (guess i should have said decked:confused:) if they were checked out not to be true. 76 would be a little more pump friendly. mid 9's with a 67cc aint bad though. think its worth the bump. like i said im not looking for tons of power, and the better head shou;d help alot even without the bump in compression. hmm lots to think about.. oh yeah what should i do about the chip?
     
  8. 85burbanator

    85burbanator 1/2 ton status

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    im thinking of tossing on the edelbrock mpfi, and appropriate(sp) heads and cam. got with the folks at edelbrock and the tech person said it should be around 290 hp or so. my block is punched out .030 over as well. just an idea. if i stay tbi ill prolly get some stuff from cfmtech or affordable fuel injection.
     
  9. 79k20350

    79k20350 3/4 ton status

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    im not looking to dump 1200 into another injection system when the tbi just needs some tweaking
     
  10. neverendingproject

    neverendingproject 1/2 ton status

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    Go 383, vortec heads, al. roller rockers. The stuff can be had cheap enough if you know where to look. This motor is built with the same specs as gm's 383 ht (340 HP 435 TQ) but with a TBI system. Plenty of power if you ask me.:D

    DSC00354.JPG

    104_1098.jpg
     
  11. 79k20350

    79k20350 3/4 ton status

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    what are you doing to upgrade the tbi system? Looks good by the way! :waytogo:
     
  12. tiger9297

    tiger9297 1/2 ton status

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    Which TBI system are you using? Do you expect to get the same 340hp 435 tq with the TBI? Also, where do you look to find 383 stuff cheap? I am very interested. Great looking engine by the way.
     
  13. southernspeed

    southernspeed 1/2 ton status GMOTM Winner

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    I bored +.30 with flat top pistons, stock heads, Edelbrock intake and performer cam, stock throttle body and am very pleased with it. I've bought everything I need to burn some new chips (and have experimented with a few) but to be honest it runs so well on the stock chip I doubt I'll improve on it much.
     
  14. neverendingproject

    neverendingproject 1/2 ton status

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    I found a good deal on a holley TBI (670cfm), and I have to use a 50 dollar high pressure TBI pump (~20psi). I got pistons and a crank for about 400 even, brand new, in box, from a guy who has his store on ebay. 30 over speed pro pistons and a scat crank. I spent about 600 on machine work (bore hone balance, etc.). I am also using a marine intake for TBI, but you can get q-jet ones to work with an adapter. A 454 TBI would work, but you would still have to have a custom chip burned, which I got one for a little over 150.

    EDIT: I thinking I will have close to the same numbers. Im running 1.6 rockers on the exhaust and TBI (gm tests on carbs). So im thinking 345hp and around 450tq
     
  15. 71 Blazer

    71 Blazer 1/2 ton status

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    TBI motor

    Vortec heads are the greatest thing since sliced bread! Not sure if they make intakes that match vortec heads to TBI though.
     
  16. 79k20350

    79k20350 3/4 ton status

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    arent vortec and tbi heads the same pattrn for intakes? if so would vortec heads be a good way to go. ive never really read up on the newer stuff. what is differant about vortecs? isnt it the shape of the combustion chamber?
     
  17. 71 Blazer

    71 Blazer 1/2 ton status

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    TBI motor

    No the angle where it sits between the heads is the same, its the bolts that hold it to the head that are at a different angle than the older intakes. I have read about people modifying them to fit though.
     
  18. 79k20350

    79k20350 3/4 ton status

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    thats right it has 4 vertical instaed of angled botl holes right? and uses like 8 bolt instead of 12? when i said differant shape, i meant combustion chamber
     
  19. 71 Blazer

    71 Blazer 1/2 ton status

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    TBI motor

    Not sure about the combustion chamber, but I do know that GM sells them for around $500 a pair and they flow way better than his TBI heads.
     
  20. neverendingproject

    neverendingproject 1/2 ton status

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    you can either get a gmpp intake $$$$$, a marine intake (no egr, less $$$) or get a carb intake (even less $$).

    Vortec heads have different port shape and bolt pattern, 8 bolts and I think the port is like 1/2 inch taller.
     

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