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Technical Blown 383 pistons

Discussion in 'The Hokey Ass Message Board' started by Wytnes_me, Aug 4, 2018.

  1. Wytnes_me
    Joined: Aug 3, 2018
    Posts: 7

    Wytnes_me

    Just joined the forum, though I've referenced many times in the past for great info. I did a search on the topic, but most of the posts are quite dated so I thought of throw out a fresh one to see if there are any new opinions/products.
    My set up is a Gen 1 350, 4 bolt main. Will be running a forged, polished Eagle blower crank with blower keyways, SCAT h-beams, hyd roller set up, 671 blower.
    My question is that of longevity/reliability. I want a streetable engine that'll run on pump dinosaur.
    I've looked at the MAHLE pistons, and they look like nice forged units that don't get into the ring lands, but I've found nothing with people running them under boost.
    I'm open to suggestions, but want to stay round $500-$700 for the slugs. I plan on running it round 8.0-8.3 comp.
    Thanks in advance for any and all info.
     
  2. 8:1 forged TRW's have served well with my 355/6-71 motor for over 20 years. Did a total rebuild in 2010 and the pistons were still perfect. Don't know how much boost you plan to run, the 12 lbs I'm running is plenty for street.
    Also the guys here might be willing to offer more help if you do an intro.
     
  3. Wytnes_me
    Joined: Aug 3, 2018
    Posts: 7

    Wytnes_me

    Thanks very much for the info.
    I'm new to the site, I'm not sure where to post an intro, but am more than willing. Not very tech savvy, me, but definitely willing to give it a go.
     
    Deuces and 31hotrodguy like this.
  4. Wytnes_me
    Joined: Aug 3, 2018
    Posts: 7

    Wytnes_me

    I plan to run 8-9 psi
     
    Deuces likes this.
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  5. CNC-Dude
    Joined: Nov 23, 2007
    Posts: 804

    CNC-Dude
    Member

    The problem with stroker motors is they do often require the oil ring to be cut into the wrist pin cavity because the wrist pins have to be moved higher in the piston body. The fact that the Mahle piston your looking at doesn't is appealing from one aspect, but also means the rings are likely moved higher up to compensate, but this ring stack may not be friendly for boost if the top ring is to high to the deck. I would gladly take a piston with the oil ring into the wrist pin as long as you have a support rail in it, without one it can be problematic in a street engine. But you also have to have the top ring far enough down to keep it from being torched. When setting out to build any engine, you have the piston designed around your needs first, then you make everything else fit around that. Things like shorter connecting rods are more of a compromise and forgiving than a lifted top ring land.
     
    loudbang likes this.
  6. I have JE blower pistons in my engine
     
  7. squirrel
    Joined: Sep 23, 2004
    Posts: 44,631

    squirrel
    Member

    like maybe you should keep the stock stroke, and run more boost to make up for the few missing cubic inches? :) seems to work for Dean Lowe, as he said...
     
  8. BadgeZ28
    Joined: Oct 28, 2009
    Posts: 1,017

    BadgeZ28
    Member
    from Oregon

    I spent 30 minutes on the phone talking to two techs at Mahle about pistons for a OT blown motor. I recommend you do the same with whichever company you choose. Ring gap should also be discussed.
     
  9. GearheadsQCE
    Joined: Mar 23, 2011
    Posts: 2,308

    GearheadsQCE
    Member

    I looked into that awhile back. My solution was to build a 377"(4.125 +.030"bore, 3.48" stroke) Much easier to balance the compression, ring land, rod length and valve shrouding with the blower. Time will tell if the narrower deck between the cylinders will be a problem.
     
  10. jimmy six
    Joined: Mar 21, 2006
    Posts: 5,368

    jimmy six
    Member

    I'd make sure the top ring was down 5/16". Different manufactures have different ideas. I tell CP to move them down and Arias to move them up. Dean and Jim runs these blown engines; I would listen to them...
     
  11. drtrcrV-8
    Joined: Jan 6, 2013
    Posts: 1,226

    drtrcrV-8
    Member

    Just a thought: we all like JE pistons, but SRP are the same pistons/same service/appreciably cheaper! My racing was "sponsored by paycheck" so I HAD to be the "cheapest SOB in the Pits" when it came to race parts : I shopped everybody else's discards, all the race swap meets,(& the "end of the Swap deals" from those who "didn't want to take it home"!) Anything to keep it running!!
     

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