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    Chevy Caprice Dual Exhaust

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    Chevy Caprice Dual Exhaust

    Post  GM B-Body Forum on Sat Jul 13, 2013 3:20 pm

    This is my caprice, and what it sounds like with true duals, siamesed with two flowmaster original 40's


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    1979 Caprice Sport Coupe, 400hp Vortec 350, Th350, GM 8.5 w/disc brakes, 3.90 gears Detroit Truetrac, 2.5" stainless duals w/ x-pipe, Dynomax race bullets.
    1984 Caprice Sedan, 305 motor, 700r4
    1978 Caprice Sedan, 305 motor, th350
    1993 L99 Caprice, 4.3 v8, 4l60 trans
    1972 Ford F-100, 302 windsor, c4 trans
    2001 BMW E46 330i, 3.0L
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    Big C
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    Re: Chevy Caprice Dual Exhaust

    Post  Big C on Thu Oct 16, 2014 2:33 am

    Hooker comp's LT's with 40's Flowmasters xe274 cam before head mods..


    http://www.youtube.com/watch?v=xO6ZQUZYQsA
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    Re: Chevy Caprice Dual Exhaust

    Post  GM B-Body Forum on Thu Oct 16, 2014 10:38 pm

    Sounds great man! Mine should be sounding similar to that soon, im putting a set of heads on, a cam in, and all the associated stuff. My vid was a bone stock 350


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    1979 Caprice Sport Coupe, 400hp Vortec 350, Th350, GM 8.5 w/disc brakes, 3.90 gears Detroit Truetrac, 2.5" stainless duals w/ x-pipe, Dynomax race bullets.
    1984 Caprice Sedan, 305 motor, 700r4
    1978 Caprice Sedan, 305 motor, th350
    1993 L99 Caprice, 4.3 v8, 4l60 trans
    1972 Ford F-100, 302 windsor, c4 trans
    2001 BMW E46 330i, 3.0L
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    Big C
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    Re: Chevy Caprice Dual Exhaust

    Post  Big C on Thu Oct 16, 2014 11:58 pm

    GM B-Body Forum wrote:Sounds great man! Mine should be sounding similar to that soon, im putting a set of heads on, a cam in, and all the associated stuff. My vid was a bone stock 350

    Thanks,what heads and cam do you have in mind?
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    Re: Chevy Caprice Dual Exhaust

    Post  GM B-Body Forum on Fri Oct 17, 2014 10:02 am

    Ive actually got a topic on here about what im doing if you want to take a look https://www.gmbbodyforum.com/t281-vortec-head-350-project-build


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    1979 Caprice Sport Coupe, 400hp Vortec 350, Th350, GM 8.5 w/disc brakes, 3.90 gears Detroit Truetrac, 2.5" stainless duals w/ x-pipe, Dynomax race bullets.
    1984 Caprice Sedan, 305 motor, 700r4
    1978 Caprice Sedan, 305 motor, th350
    1993 L99 Caprice, 4.3 v8, 4l60 trans
    1972 Ford F-100, 302 windsor, c4 trans
    2001 BMW E46 330i, 3.0L
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    Big C
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    Re: Chevy Caprice Dual Exhaust

    Post  Big C on Sat Oct 18, 2014 1:01 am

    GM B-Body Forum wrote:Ive actually got a topic on here about what im doing if you want to take a look https://www.gmbbodyforum.com/t281-vortec-head-350-project-build

    Combo looks good in the egine compartment..I have herd of guys with mild lift cams with high duration getting good results..

    Combo is key so spill the beans on the trans,verter stall and rear gear you will use..

    I have a th350 with B&M strip kit installed B&M holeshot 3600 3.73 gear with a spool..Small blocks in our heavy cars need that stall and gear to get off the line HARD...With that duration you have you need some stall and gear..Choose wisely get the best out of your combo..

    I get questions all the time about my car at the track..Most are impressed on how hard it launches to be so heavy with a SBC..All was in the combo my cam is ALIVE on the stall as the ambers drop to GREEN..My 60 ft times are low 1.70's.Not too bad with 3.73 gears..I'm going to a 4.11 gear soon as I relocate my battery to the trunk..Front fender wells will be removed..More weight off the nose WIN WIN!!!
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    Re: Chevy Caprice Dual Exhaust

    Post  Big C on Sat Oct 18, 2014 1:11 am

    Blew a head gasket at the track..With that said I pulled the heads had them milled and had a 5 angle performance valve job done vs the 3 angle from Edelebrock..Pulled my stock fuel pump for a holley too..
    I had the speedshop perform a tune to see if they could get a little bit more out of the engine.. I had just brought the car home from the speedshop when I took this vid..
    https://www.youtube.com/watch?v=Dhip6A9TTyk
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    Re: Chevy Caprice Dual Exhaust

    Post  Big C on Sat Oct 18, 2014 1:35 am

    I have a AED 750 dbl pumper HP mech secodary carb.Jetted square with 80 jets no power valves..Best money spent..
    If you have not purchased a carb AED 750 HP!!!!! With good heads decent cam free flowing exhaust GET IT!!!You will have no regrets...Max effort vacum secodaries wont get you there.On a good tune you want all barrels open soon as you stab that loud pedal..
    That is if you will run a 3.55 gear or more and some decent stall.
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    Re: Chevy Caprice Dual Exhaust

    Post  GM B-Body Forum on Sat Oct 18, 2014 5:44 pm

    Ive got the stock 120,000 mile th350, itll probably need a rebuild after i bolt all this power on, im not sure how long itll last after this, but i recently swapped out rearends, i got a 8.5 10 bolt from a 96 impala ss, with a 3.08, but the posi is gone, so it need to have it redone and ill change the gear ratio, i was thinking a 3.55, im not building a drag car, its an all street car so im looking for torque not high end hp, but i was thinking a 3000 stall since thats where my cam should come alive. I went from the old 7.5 10 bolt with a 2.41 gear to that 3.08 and that was a huge improvement, but as the car sits now with its stock stall, it still wants and needs a taller rear end gear. That cam i installed isnt the happiest with the stock stall. Ive been trying to decide between a vac sec and mech sec carb, since im not all out dragging, i was considering the vac, but everyone is suggesting get a mech sec carb regardless, but we'll see how it all goes, theres going to be alot of testing and tuning in my future to find the right combo. But you got it right, your car sounds amazing, that throttle response is next to amazing


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    1979 Caprice Sport Coupe, 400hp Vortec 350, Th350, GM 8.5 w/disc brakes, 3.90 gears Detroit Truetrac, 2.5" stainless duals w/ x-pipe, Dynomax race bullets.
    1984 Caprice Sedan, 305 motor, 700r4
    1978 Caprice Sedan, 305 motor, th350
    1993 L99 Caprice, 4.3 v8, 4l60 trans
    1972 Ford F-100, 302 windsor, c4 trans
    2001 BMW E46 330i, 3.0L
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    Re: Chevy Caprice Dual Exhaust

    Post  Big C on Sat Oct 18, 2014 7:14 pm

    GM B-Body Forum wrote:Ive got the stock 120,000 mile th350, itll probably need a rebuild after i bolt all this power on, im not sure how long itll last after this, but i recently swapped out rearends, i got a 8.5 10 bolt from a 96 impala ss, with a 3.08, but the posi is gone, so it need to have it redone and ill change the gear ratio, i was thinking a 3.55, im not building a drag car, its an all street car so im looking for torque not high end hp, but i was thinking a 3000 stall since thats where my cam should come alive. I went from the old 7.5 10 bolt with a 2.41 gear to that 3.08 and that was a huge improvement, but as the car sits now with its stock stall, it still wants and needs a taller rear end gear. That cam i installed isnt the happiest with the stock stall. Ive been trying to decide between a vac sec and mech sec carb, since im not all out dragging, i was considering the vac, but everyone is suggesting get a mech sec carb regardless, but we'll see how it all goes, theres going to be alot of testing and tuning in my future to find the right combo. But you got it right, your car sounds amazing, that throttle response is next to amazing

    The TH350 is good trans at those miles if maintained properly I wouldnt worry about it..Once the performance parts are mounted I would go with a external trans cooler though.At 3k stall it wont hurt to have some extra cooling.

    The first thing I ever did to my car was full roller rockers..I had no idea of doing all the mods I ended up with..I just wanted a nice street rod myself..To be honest my combo is fairly street friendly..I'm kinda on the borderline of street rod/race car..Once I seen that parts list I was thinking you were on a max effort deal with what you have in mind..Dont let that new power get old/slow to you.Thats what happened in my case.Best of luck on your build Ill be waiting for a vid k. Very Happy

    I agree on the mech carb no doubt..Thanks for the comment keep us updated with your build..
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    Re: Chevy Caprice Dual Exhaust

    Post  GM B-Body Forum on Sat Oct 18, 2014 8:20 pm

    Yeah im definitely on a max effort with what ive got, trying to get the most without having machine work done on the block, or changing the bottom end. I put a big cooler on a few years ago, and the tranny definitely liked that. The only thing is the new power will always get slow! lol When i first got the new crate motor dropped in, in replace of the old 350, and took it for a drive, i was quite amazed, but it soon left, and i wanted more, thats the bad part.


    _________________
    1979 Caprice Sport Coupe, 400hp Vortec 350, Th350, GM 8.5 w/disc brakes, 3.90 gears Detroit Truetrac, 2.5" stainless duals w/ x-pipe, Dynomax race bullets.
    1984 Caprice Sedan, 305 motor, 700r4
    1978 Caprice Sedan, 305 motor, th350
    1993 L99 Caprice, 4.3 v8, 4l60 trans
    1972 Ford F-100, 302 windsor, c4 trans
    2001 BMW E46 330i, 3.0L

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