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Thread: Muscled up 4.3L V6 *Pics**Video*

  1. #31
    Registered User Catching Second's Avatar
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    In engine building to make the engine run it's best every part you put in the motor should match every other part in the motor. Most people just have this idea in their head that a big cam will make me faster.. or a set of big heads is going to make that thing haul. Very untrue.

    Flow is key. If you have a stock set of heads and a stock intake putting a big cam in the motor is going to disappoint you if you're looking for vasts ammount of power. Sounds great... mean. But a cam is only as good as the heads and intake above it.

    Another thing is decided the use of the motor. Strip only, street/strip, street, everyday. From there you base the WHOLE build on. You don't want to put a set of 215cc heads and a Victor Jr intake on something that will never see the track (or it's too high for street power ban). On the other side of the road you don't want a stock set of heads and intake if you plan on having any kind of performance use. It's un-wanted restriction.


    And I don't care what anyone says, porting and polishing a stock set of low-flow heads does not mean they are 'the shit'. Rule of thumb for me (from experience) is leave the port and polish work for a good set of heads. Porting is not to increase the size of an intake runner. It's to match the intake manifold's runners to the head's intake runners to maximize flow.

    Also while I'm on the subject. Boring is over-rated in my opinion. People I know claim they have done nothing more than bored a motor and "can feel a difference". Fu-bar.
    "A true hotrodder wouldn't be content untill he had created a car so violent, so hairy, so totally sick that the very act of dropping the hammer would result in instant death. Anything less results in the need to go faster." - Tony DeFeo

  2. #32
    Registered User lowblazin94's Avatar
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    Well let's not all try to kick the dog at once now. I think he is just showing his build and what it did. He was never mentioning that this thing was going to be over 500hp. And yes we can all agree that is a monster for a 4.3 and that some of you are building "BEASTS". I only know of a few members building their 4.3's and I enjoy seeing them back together knowing what they can do. Like everyone says, to each his own. I give him credit for what he did. At least it runs and doesn't sound like he's got a fart can on it.
    Last edited by lowblazin94; 06-24-2006 at 07:11 PM.
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  3. #33
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    Originally posted by Catching Second
    Porting is not to increase the size of an intake runner. It's to match the intake manifold's runners to the head's intake runners to maximize flow.
    I thought port MATCHING was what you said and porting WAS making them bigger.


    89' S10 blazer 4wd: 355, 650 dp, rpm intake, comp 282 roller cam, modified vortecs, T56 Six speed, 8.8 ls rear, headers, x-pipe, spintech pro street mufflers, and......AC

    Blazer burnout video - http://www.youtube.com/watch?v=sP7iLypoDI4

  4. #34
    Double Bagged s10blaza's Avatar
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    ooooooooooh

  5. #35
    Registered User Catching Second's Avatar
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    Originally posted by Superbee
    I thought port MATCHING was what you said and porting WAS making them bigger.
    True. I forgot to add the "in most cases". I just see people porting the hell out of heads for really no reason all the time. If you hooked the heads up and tested the flow before porting and afterwards you would see hardly much of an increase. "Port match" them and you will see the numbers go up. But just trying to make a low-flow 150cc runner flow better by making it a 155cc runner.. well, you get the idea.
    "A true hotrodder wouldn't be content untill he had created a car so violent, so hairy, so totally sick that the very act of dropping the hammer would result in instant death. Anything less results in the need to go faster." - Tony DeFeo

  6. #36
    Registered User primus's Avatar
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    Originally posted by Teeleton
    There's more in it, for sure. It's got a pretty bad timing skew between cylinders right now that I need to sort out. In other words, each of the cylinders is running on a different advance, which sucks. As for the money spent and the result achieved. Oh well. Not your money, I wouldn't worry about it.

    Eventually, the bottom end is going to see the likes of a healthy shot of nitrous. Gotta get some money together and my timing stabilized first, though.

    Teeleton

    i'm really excited about watching this build, i hope u can get it all figured out and get into the 14's it's achievable for sure


    keep the updates coming :D
    RUN WITH SIZZORS!!!, I DO!!!


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  7. #37
    Zombie Killer 6SpeedBlazer's Avatar
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    Originally posted by Catching Second

    And I don't care what anyone says, porting and polishing a stock set of low-flow heads does not mean they are 'the shit'. Rule of thumb for me (from experience) is leave the port and polish work for a good set of heads. Porting is not to increase the size of an intake runner. It's to match the intake manifold's runners to the head's intake runners to maximize flow.
    i agree the stock LB4 heads are rated about about 130ish intake and 115 ish exahust hotrod did a SHIT TON of port work and installed oversized valves and got 203 cfm intake and 190 exhaust

    they didnt know any better but if they would have bought a set of stock 96> heads they could ahve gotten 220 intake 156 exhaust out of the box.

    Originally posted by SSF

    Well I finally got around to testing out my old pair of pocket ported CPI heads verses the pocket ported 96 Vortec heads that I just got done with.

    Here are the results


    Stock 1996 vortec head flow
    28 of water

    Lift Intake Exhaust
    .050 31.7 25.4
    .100 63.6 52.1
    .200 127.9 96.8
    .300 179.4 130.9
    .400 223.2 147.5
    .500 227.7 156.3


    Pocket Ported 1996 Vortec heads
    Stock valve size, performance valves and 3 angle valve job
    28 of water

    Lift Intake Exhaust
    .050 33.2 27.1
    .100 65.7 54.9
    .200 133.4 102.9
    .300 181.7 137.7
    .400 224.6 155.0
    .500 246.3 180.9


    Pocket Ported 1992 L35 (CPI) heads
    Stock valve size, performance valves and multi angle valve job
    28 of water

    Lift Intake Exhaust
    .050 31.9 24.4
    .100 63.9 50.6
    .200 126.1 95.1
    .300 175.7 120.5
    .400 204.8 137.2
    .500 221.3 148.6

    Here is a last minute update!!

    I have done alittle more port work on the 1996 vortec heads. I also deshrouded the valves alittle bit which helped the airflow in the upper lift range.

    Now the final airflow is 268.7 CFM intake and 203.1 CFM exhaust. The deshrouding also oped up the combustion chambers to 69CC.... and in my application that helped out alot.

  8. #38
    Registered User BNOTIZD's Avatar
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    Question car show in kenly n.c.

    :) A car show in kenly n.c a top 50 show a d.j on hand. cheack it out at rollingriders.com
    V6 > V8

  9. #39
    ZQ8 Jimmy 92Jimmy's Avatar
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    Is it possible to run a CPI on a 4.3L that's been beefed up? Biggest thing is running a bigger cam and yet still keep the computer/stock fuel system. If need be, I'll add higher # injectors and a bigger fuel pump.

    .040 over forged Flat tops with 2 valve reliefs
    1992 L35 Heads 3 angle valve job 2.02/1.90 valves (if it's possible)
    Eagle H-Beam rods(eventually)
    Custom grind cam (not sure of how I want it ground yet)

    What should I look towards as far as problems I may run into with keeping my CPI. I want to be the first to have a CPI injected 4.3L Also, I am wanting to put at 75-125 shot of Nitrous eventually. Can I achieve this? I have a person who can reflash the computer so that's not a problem. Any help? Thanks. -Josh
    85' Jimmy 2Dr 2WD Blown 2.8L*Sold*
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    Quote Originally Posted by FeTTo View Post
    please tell me you just took your stupid pill before posting that :evil: :evil: :evil: :evil:

  10. #40
    Senior Member ir1d3d1rt's Avatar
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    i had a built 4.3 had a lot work it was pretty quick... anyways maybe this will give you a little motivation.

    300hp 4.3
    it would be easier with more money.

    my project thread

  11. #41
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    Originally posted by ir1d3d1rt
    i had a built 4.3 had a lot work it was pretty quick... anyways maybe this will give you a little motivation.

    300hp 4.3


    Those are some mean videos!


    89' S10 blazer 4wd: 355, 650 dp, rpm intake, comp 282 roller cam, modified vortecs, T56 Six speed, 8.8 ls rear, headers, x-pipe, spintech pro street mufflers, and......AC

    Blazer burnout video - http://www.youtube.com/watch?v=sP7iLypoDI4

  12. #42
    Zombie Killer 6SpeedBlazer's Avatar
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    Originally posted by 92Jimmy
    Is it possible to run a CPI on a 4.3L that's been beefed up? Biggest thing is running a bigger cam and yet still keep the computer/stock fuel system. If need be, I'll add higher # injectors and a bigger fuel pump.

    .040 over forged Flat tops with 2 valve reliefs
    1992 L35 Heads 3 angle valve job 2.02/1.90 valves (if it's possible)
    Eagle H-Beam rods(eventually)
    Custom grind cam (not sure of how I want it ground yet)

    What should I look towards as far as problems I may run into with keeping my CPI. I want to be the first to have a CPI injected 4.3L Also, I am wanting to put at 75-125 shot of Nitrous eventually. Can I achieve this? I have a person who can reflash the computer so that's not a problem. Any help? Thanks. -Josh
    yes its possible, but there are a few drawbacks to the cpi motors. the injectors are NOT upgradable. plus there is very limited knowledge on the ecu so its hard to get chips made

    my 4.3 is decently quick. just need some gears to make it a screamer
    Last edited by 6SpeedBlazer; 03-06-2007 at 08:08 PM.

  13. #43
    Registered User BNOTIZD's Avatar
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    Originally posted by 2low4fathoes
    nice effin v6 dude and i think you did a good job on the whole thing if you dont mind me askin were did you get the headers and how much did the cam a lifer set run you?

    Sorry it took so long to reply but my brother-in-law got them for me bo.
    V6 > V8

  14. #44
    Registered User BNOTIZD's Avatar
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    Originally posted by 2low4fathoes
    nice effin v6 dude and i think you did a good job on the whole thing if you dont mind me askin were did you get the headers and how much did the cam a lifer set run you?

    sorry it took so long to reply but my brother-in-law got the headers for me and the cam set was about 650.00 to much if you ask me but i love the way my motor looks and sounds with the cam inside.:)
    V6 > V8

  15. #45
    Registered User BNOTIZD's Avatar
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    Originally posted by Superbee
    Those are some mean videos!
    thanks thats a nice set up on that 4.3 v6 bo. more videos to come soon.
    V6 > V8

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