350 short block build help

Discussion in 'High Performance Modifications' started by slamdik, Nov 21, 2007.

  1. slamdik

    slamdik Member

    Messages:
    75
    Likes Received:
    7
    Joined:
    Oct 18, 2004
    Location:
    Ipswich Ma
    vvv
     
    Last edited: Apr 21, 2009
  2. thedude327

    thedude327 Veteran Member

    Messages:
    778
    Likes Received:
    2
    Joined:
    Feb 21, 2004
    Location:
    Brighton,Michigan U.S.A.
    With 76cc heads, you'll definately need domed pistons to get 10:1 comp.

    and if your running nitrous, start thinking about forged rods, arp rod bolts ,

    forged crank too. It'll be cheaper to buy good parts to start with, unless you

    enjoy frequently disassembling and rebuilding your engine..............Oh and

    with domed pistons, make sure you check your valve to piston clearance or

    see the previous sentence............Good luck !!!!!!!!!!!!!!!! ;)
     
  3. pdq67

    pdq67 BANNED

    Messages:
    10,496
    Likes Received:
    1
    Joined:
    Jul 26, 2001
    Location:
    Columbia, MO, USA
    He said forged crank AND all Chevy V-8's have forged rods!

    As for 10 to 1 CR, a stock L-48 engine is 10.25 to 1 CR'd and more like 10 w/ 64 cc heads, -5 cc 4-notch flat-tops and .020" thick steel shim headgaskets!!

    I'd ditch your heads and find one's w/ right at 64 cc's or whatever your bore end's up making your CVR turn out to!

    Then use true flat-top forged pistons and go!! I say this b/c a small chamber and flat-top pistons create a much better eff. combustion vs domes where the flame front has to go around a big dome unless you really know what you are doing.

    Of course rebalance her too!

    And I would use good rod bolts too like Dude said.

    pdq67
     
  4. thedude327

    thedude327 Veteran Member

    Messages:
    778
    Likes Received:
    2
    Joined:
    Feb 21, 2004
    Location:
    Brighton,Michigan U.S.A.
    Whoops................Dropped the ball on that forged crank and should've said good quality forged rods like "I" beam or "H" beams. I would agree with the smaller combustion chambered heads too about 64cc with a good (forged)
    flat top piston would make more sense to me too. Je makes a good lightweight piston..............ask me how I know...................:bowtie:
     
  5. slamdik

    slamdik Member

    Messages:
    75
    Likes Received:
    7
    Joined:
    Oct 18, 2004
    Location:
    Ipswich Ma
    First off thank you guys for the quick replys.

    I realy don't want to "ditch" my $1400 AFR's.Can they be milled?

    What's the difference between a "true" flat top and a "false" f/t?

    Thanks again


    Sean
     
  6. thedude327

    thedude327 Veteran Member

    Messages:
    778
    Likes Received:
    2
    Joined:
    Feb 21, 2004
    Location:
    Brighton,Michigan U.S.A.
    AFR's website has a contact link to email them. They should be able to tell you how much, those heads of your's can be milled. Bear in mind that if you mill them, it may also require you to mill your intake manifold so that everything lines up when you bolt it together, otherwise you could end up with a vacuum leak where the intake bolts to the heads. I'll have to refer you to pdq for the difference in flattop pistons...................Good Luck!!!!!!!!
     
  7. Mwilson

    Mwilson Veteran Member

    Messages:
    18,561
    Likes Received:
    127
    Joined:
    Sep 14, 2004
    Location:
    Raleigh / Holly Springs, NC
    Its gonna take a big dome I have .125 domes and 64cc with .037 quench and Im only 11.3X:1
     
  8. slamdik

    slamdik Member

    Messages:
    75
    Likes Received:
    7
    Joined:
    Oct 18, 2004
    Location:
    Ipswich Ma
    I found c/r calculator http://www.csgnetwork.com/compcalc.html.

    According to this I'll get about 9.8 w/ flat tops and 0 deck.

    May I'm screwing up some numbers.

    Let's say I can only get 9:1 w/ my 76cc . How much will this effect power vs.

    a 10:1?(is it worth worrying about it?)



    Sean
     
    Last edited: Nov 23, 2007

Share This Page