408 Update

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    Author Topic: 408 Update  (Read 2254 times)

    Offline matt63

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    408 Update
    « on: February 05, 2006 - 05:10:08 PM »
    There is not much left now - just a few details before I drop her in!  It's a 408 with a Magnum top end, Hughes hydraulic roller cam and Edelbrock heads.
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    Matt in Edmonton

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


    Offline ESGEE

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    Re: 408 Update
    « Reply #1 on: February 05, 2006 - 05:23:42 PM »
    Looking good :thumbsup:
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    70 Challenger RT/SE(Looking for 383 Magnum N0B196875)
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    Offline matt63

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    Re: 408 Update
    « Reply #2 on: February 05, 2006 - 05:27:28 PM »
    Quote from: ESGEE on February 05, 2006 - 05:23:42 PM
    Looking good :thumbsup:
    Thanks.  If only I could find an aftermarket oil filler cap now.
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    Matt in Edmonton

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

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    Re: 408 Update
    « Reply #3 on: February 05, 2006 - 08:53:08 PM »
    She looks ready to fire up right now.   :ylsuper:   Let us know how she runs.   :burnout:   :cooldancing:  ...Oldschool
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    Offline pink panther

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    Re: 408 Update
    « Reply #4 on: February 05, 2006 - 08:58:13 PM »
    nice
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    Scott   -  Member since 9/18/2005

    Offline Hopalong

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    Re: 408 Update
    « Reply #5 on: February 07, 2006 - 08:00:25 PM »
    Are you using a magnum block or is it pre-magnum?  I have a couple of 5.9 magnum cores around and have thought about doing a stroker motor myself with the eddy heads and all.  I think Mopar Performance has cast aluminum valve covers for magnum heads. 
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    Offline matt63

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    Re: 408 Update
    « Reply #6 on: February 08, 2006 - 10:04:03 PM »
    Quote from: Hopalong on February 07, 2006 - 08:00:25 PM
    Are you using a magnum block or is it pre-magnum?  I have a couple of 5.9 magnum cores around and have thought about doing a stroker motor myself with the eddy heads and all.  I think Mopar Performance has cast aluminum valve covers for magnum heads. 
    It's a pre-magnum/LA block.  Mopar is the only maker of Magnum valve covers as far as I know. They are $200 US.  Pre-magnum covers do fit.
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    Matt in Edmonton

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

    Offline Hopalong

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    Re: 408 Update
    « Reply #7 on: February 09, 2006 - 08:17:13 PM »
    I like what you did with the stock valve covers though!  Just curious, why did you go with magnum style heads?  It seems that since you are a pre-magnum bolck and eddy heads, I thought you would have gone with LA style heads.  Just curious.
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    Offline matt63

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    Re: 408 Update
    « Reply #8 on: February 09, 2006 - 08:26:56 PM »
    Primarily for rocker arm choice/price as they take Chevy rockers.  Also, the heads have vertical bolting and 10 valve cover bolts which  is nice.
    The valve covers are just painted now but I may have them powder coated later on.
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    Matt in Edmonton

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

    Offline Hopalong

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    Re: 408 Update
    « Reply #9 on: February 11, 2006 - 10:29:17 AM »
    Any ideas on power output yet?  I am very interested in this combo.  What ratio rockers did you use?
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    Offline matt63

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    Re: 408 Update
    « Reply #10 on: February 11, 2006 - 01:21:43 PM »
    According to Hughes Engines this combo has put out 460-480 hp on the dyno.  The bottleneck will be the heads as they have only a clean-up, port match and back cut valves.  They flow about 10-15 cfm more than the stock Eddys.  With porting they would have recommended more duration.  I am using Comp Cams Promagnum 1.6 rockers which gives me about 0.525 lift 
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    Matt in Edmonton

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

    Offline matt63

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    Re: 408 Update - It Runs!
    « Reply #11 on: May 26, 2006 - 07:35:53 PM »
    If finally got it started after numerous electrical problems (see posts) and an extremely noisy power steering pump that got me worried for a few minutes.  I got the initial timing done and it sounds pretty good.   The distributor has way too much advance in it so I'll have to deal with that soon. There are no leaks! It's quiet with the TTI exhaust and the Hughes cam has only a mild lope (I would of liked a little more).  It's going to be bit of a sleeper.  I hope to have the first test drive in a week or so.
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    Matt in Edmonton

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

    Offline Bullitt-

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    Re: 408 Update
    « Reply #12 on: May 26, 2006 - 08:03:33 PM »
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    Wade  73 Rallye 340..'77 Millennium Falcon...13 R/T Classic   Huntsville, AL
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    Offline Chryco Psycho

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    Re: 408 Update
    « Reply #13 on: May 27, 2006 - 05:51:33 AM »
    I make a habit of not breakin gin new engines with the power steering belt on just so you don`t have to shut down during the 20 minute break in 
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    Challenger - You`ll wish You Hadn`t

    Offline matt63

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    Re: 408 Update
    « Reply #14 on: May 27, 2006 - 09:12:52 PM »
    Good advice.  I went with the roller cam so break-in isn't critical.  Another $100 and I've got a rebuilt Saginaw pump in there now.(after the $100 earlier this week for a new ignition switch and signal switch)
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    Matt in Edmonton

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