How much HP from 340

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    Author Topic: How much HP from 340  (Read 1588 times)

    Offline dazza

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    How much HP from 340
    « on: February 28, 2006 - 05:42:43 PM »
    Hi some time soon im building a 340 for my 1970 challenger and was hoping for about 460hp at the wheels :burnout: any help with combos would be great i plane to use W cast heads. Eg cam pistons rods. Thank you
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    Offline Chryco Psycho

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    • 70 Challenger R/T SE 70 tube Chassis Cuda now sold
    Re: How much HP from 340
    « Reply #1 on: February 28, 2006 - 08:28:26 PM »
    I have never pushed a 340 that far but with an R3 block & W8 or 9 heads it should be easy to do 
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    Challenger - You`ll wish You Hadn`t

    Offline matt63

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    Re: How much HP from 340
    « Reply #2 on: February 28, 2006 - 10:43:39 PM »
    I think that 460 hp at the wheels is around 575 hp at the flywheel.  This is beyond the limits of a stock block.   I agree with Chryco on the R3 block requirement.   
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    Matt in Edmonton

    '68 Valiant
    '73 Cuda 340 4 speed (408) SOLD

    Offline GreenFish

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    Re: How much HP from 340
    « Reply #3 on: March 01, 2006 - 06:42:36 PM »
    just strap one of these on it... www.thesuperchargerstore.com
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    70 cuda, 440, KB pistons, 10.5:1 compression, edlebrock heads,RacerBrown cam, 5-Speed Tremec, Megasquirt EFI

    Offline dazza

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    Re: How much HP from 340
    « Reply #4 on: March 02, 2006 - 03:36:31 AM »
    With a stock block with 4 bolt mains, W heads, solid cam, what would be a realistic figer of HP at the wheels? I would love to see 400hp but is this possible? I just want to put my uncle to shame on the drag strip he owns a sky line with 400hp at the wheel and im not going to let a whoosh bang jap car beat me.
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    Offline Chryco Psycho

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    Re: How much HP from 340
    « Reply #5 on: March 02, 2006 - 11:51:11 PM »
    I knew a couple of successful racers that did a wicked small block & with a lighter chassis were only .4 or less off pro stock times in a similar chassis , it can Definatly be done
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    Challenger - You`ll wish You Hadn`t

    Offline Follicly Challenged

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    Re: How much HP from 340
    « Reply #6 on: March 03, 2006 - 10:22:27 AM »
    Just my 2 cents,

    Are the aftermarket SB Mopar blocks available again ? 340 resto Block ? Last time I checked there wasn't any ?

    I've done a few SB strokers @ "up to" 540 hp W/flat-tappet cam/pump fuel, for street guys. Haven't had ANY problems to date with the mains on the 2 bolt with studs, more with wanting to "push the cylinder walls out" on strokers @ higher rpm/power output. But that takes a few years beat'in on it.

    Not that the aftermarket block isn'y highly recomended, it is.

    It's just I'm not afraid anymore "at all" of the stock blocks when stroking @ the low 500's hp/6000 rpm. Plenty "Nuff to squish the Ricer when setup properly, besides his car is FUGLY !

    PS; look at the "stock" SB Ford blocks.

    Reminds me of "cheezies and pretzels" in a bowl, when compared to a SB Mopar.
    But, we regularily build 'em W/studs, and the the Ford "MO's" put boost at 'em for 500 hp level, and they live just fine ! Go Figure !

    FC out
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    Offline matt63

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    Re: How much HP from 340
    « Reply #7 on: March 03, 2006 - 05:17:58 PM »
    The other limitation on SB engines is the weaker head bolting and perhaps the air flow limitation on the heads.  But again, these are not a bottleneck at 500 hp.  My 408 should be 460-475 hp with only mild porting of Eddy heads and a moderate hydraulic roller cam.
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    Matt in Edmonton

    '68 Valiant
    '73 Cuda 340 4 speed (408) SOLD

    Offline EBodiesRule

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    • Mopar or Nocar
    Re: How much HP from 340
    « Reply #8 on: March 10, 2006 - 02:00:04 PM »
    Quote from: Follicly Challenged on March 03, 2006 - 10:22:27 AM
    Just my 2 cents,

    Are the aftermarket SB Mopar blocks available again ? 340 resto Block ? Last time I checked there wasn't any ?

    I've done a few SB strokers @ "up to" 540 hp W/flat-tappet cam/pump fuel, for street guys. Haven't had ANY problems to date with the mains on the 2 bolt with studs, more with wanting to "push the cylinder walls out" on strokers @ higher rpm/power output. But that takes a few years beat'in on it.

    Not that the aftermarket block isn'y highly recomended, it is.

    It's just I'm not afraid anymore "at all" of the stock blocks when stroking @ the low 500's hp/6000 rpm. Plenty "Nuff to squish the Ricer when setup properly, besides his car is FUGLY !

    PS; look at the "stock" SB Ford blocks.

    Reminds me of "cheezies and pretzels" in a bowl, when compared to a SB Mopar.
    But, we regularily build 'em W/studs, and the the Ford "MO's" put boost at 'em for 500 hp level, and they live just fine ! Go Figure !

    FC out


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    Hey, FC, check your mailbox. I just sent you a PM.

    Greg
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    “IF YOU'VE GOT TIME TO TURN LEFT...YOU AIN'T GOING FAST ENOUGH”

    Offline EBodiesRule

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    • Mopar or Nocar
    Re: How much HP from 340
    « Reply #9 on: March 10, 2006 - 02:01:11 PM »
    Quote from: matt63 on March 03, 2006 - 05:17:58 PM
    The other limitation on SB engines is the weaker head bolting and perhaps the air flow limitation on the heads.  But again, these are not a bottleneck at 500 hp.  My 408 should be 460-475 hp with only mild porting of Eddy heads and a moderate hydraulic roller cam.


    +++

    Hey, Matt. Check your email messages on this site. I just sent you a PM.

    Greg
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    “IF YOU'VE GOT TIME TO TURN LEFT...YOU AIN'T GOING FAST ENOUGH”
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