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stg II heads on a 383?

This is a discussion on stg II heads on a 383? within the Internal Engine forums, part of the LSx Technical Help Section category; i got a set of NEW patriot performance stage II ls6 heads with 2.055/1.57 valves and 59cc combustion chambers for ...

  1. #1
    Member wesTXwitesnake05's Avatar
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    2000 Trans Am WS6

    stg II heads on a 383?

    i got a set of NEW patriot performance stage II ls6 heads with 2.055/1.57 valves and 59cc combustion chambers for $900 on ebay. i cant decide on a forged 347 short block or a 383 after my warranty expires. would these heads flow enough for a 383 even with a ported ls6 intake and 80mm bbk t/b? i think a 347 would be just as good but who could resist a stoker?

    if i get a 347 i was going to use this cam from vinci high performance with thier accelerated lift rockers:
    DUR @ .004" 284* / 290*
    DUR @ .050" 222* / 228*
    LIFT .551 / .551
    OVERLAP 57*
    LSA 115

  2. #2
    Senior Member mrr23's Avatar
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    dark bowling green
    2000 corvette

    that's a pretty hefty intake valve for a stock bore 346 motor. more than likey run into valve shrouding due to cylinder bore interference. IMO, they will flow just fine on a 383 motor provided you do it with a larger bore. like the 6.0L block with the 4.00" bore or the LS2 motor.

    nice choice on cam btw.

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    Grand Imperial Wizard Sarge's Avatar
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    Yup...those are the heads I had on my LS1...hell they flow at over 300cfm @ .600 lift....290ish @ .500....great heads.....they would love that 383

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    Member wesTXwitesnake05's Avatar
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    Quote Originally Posted by mrr23
    that's a pretty hefty intake valve for a stock bore 346 motor. more than likey run into valve shrouding due to cylinder bore interference. IMO, they will flow just fine on a 383 motor provided you do it with a larger bore. like the 6.0L block with the 4.00" bore or the LS2 motor.

    nice choice on cam btw.



    so i better change the valves to 2.02? or get a 383 ls2 short block???

  5. #5
    adude
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    Those heads flow like a banshee. IMO you would almost be wasting them on a 346 due to their flow capacity and the valve shrouding issue as mrr23 pointed out. IMO again you need more cubes mainly from bore (helps unshroud I valve) or more rpm so you are moving more F/A mixture, the later still leaves you with the valve shrouding issue and way more strain on internals. Bore and Stroke for me. By the way it's pretty hard to put a smaller valve in a head that is machined for a big valve (2.02 in a 2.055 seat).

    Good luck>>>>Dan

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    Member wesTXwitesnake05's Avatar
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    i asked nick agnostino at Agostino-Racing engines about the valve shrouding issue and he said: "we use 2.055 intake valves all the time on
    the factory bore and they work great. I do not
    recomend going any bigger (2.08) as we have tried it
    and there are no power gains; actually some small
    losses. So in short the heads you have will work great
    on the 383 short block."

    "Here is quotation on one of our 383's:

    Eagle 4.00 stroke crank
    Eagle 6.125 rods
    Wiseco light weight pistons
    FM race series bearings
    Childs & Albert file fit ring set
    New LS6 block with cam bearings installed
    Block square decked, line honed, honed with torque
    plates and clearenced for stroker crank
    Assembly fully balanced
    Engine fully assembled with build sheet attatched

    OUTRIGHT PRICE (no core charge required):

    $ 3,850.00 usd plus shipping
    $ 150.00 Add main studs
    "

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