What is the stock size bore on a new GM iron-block six liter Gen III motor?

If you stuff a 4.125 crank in it using a stock-sized bore, how many cubes (inches please)would that make? I assume overboring it 40 or 60 thousands will not give that much more in cubes...

Do I need dished pistons to avoid too much CR if my head chambers are 60CC?

Do rotating assemblies for this setup come in a kit yet?

 

4.000 = stock bore for LQ4

 

...can i order the rotating assembly with dished pistons so i can stay about 10.5 CR?

...who sells them besides lunati? I don't think i need a forged crank with a NA motor with no NOS so are there any less costly ones avialable? $6K seems like a lot for a stroker short block...

...someone should market an assembled short-block based on the iron 6-liter with a "cheap" nodular iron stoker crank that yields 400+ inches... surely people would pound down some doors to get this for $3.5K....

hey sponsors: are you listening?

 

GENTLEMAN:

I will post the most simplistic forumula for computing CID when i get home tonite that a forum member just turned me onto.

Its so simple a 2nd grader could compute CID with this forumula. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

MTI 427 Roadster

 

Stroker cranks are not cheap, what can ya do.

Even when you look at how much a Lunati 4.000 crank is, it's not terribly more expensive than a SBC or LT1 4340 forged crank offering... Ours are like <$2000 for cost and SBC ones are like $1000.

 

6.0 + 4.125 crank = ~414ci
bored .030 = ~420
bored .060 = ~427

Any LS1 rotating assembly will work.

 

bore x bore x stroke x # of cylinders divided by a number i can't remember. <img border="0" alt="[bang head]" title="" src="graemlins/gr_banghead.gif" /> i have it at home. anyone?

 

it's bore x bore x stroke x #cylinders x pi(.7854)

 

HERE it IS! The World's easiest forumula (and accurate to) for determining CID=

.7854 x 8 x Bore x Bore x Stroke = cubic inch


YOUR WELCOME! <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />

MTI 427 C5 Roadster

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by robertbartsch:
<strong>$6K seems like a lot for a stroker short block...

...someone should market an assembled short-block based on the iron 6-liter with a "cheap" nodular iron stoker crank that yields 400+ inches... surely people would pound down some doors to get this for $3.5K.... </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Maybe in 10-20 years this will be an option, but as for right now, you gotta pay to play. <img border="0" title="" alt="[Frown]" src="gr_sad.gif" />

 

yeah like if you can buy a quality scatt nodular iron stroker crank for a few hundred bucks,surely theres no scientific evidence that implicates lsx cranks are any more expensive to manufacture .its like for some weird reason lsx engine punters get some sort of exile tax burdeon or companys scheming agendas.
i mean you get some big name enterprises that made their millions years ago,yet refuse to get on with the concept of seamless stategic manufacturing counter saving measures to end up providing
the resellers a better deal!
lets get real here.everyone likes to see no bull affordable stroker kits in various basic,semifinished,fully finished or complete assembled
options with consideration to each persons needs where material
allows.
conversely in oz you can nail a brand new iron block + 4in crank that yields 427 ci for a tad over $1600us + yet these brands are proven to handle 7000+rpm all day! now how does this work when them
kits have been imported directly from the usa beforehand ?yet allow so much margin for the engine builder to
just add ye pistons and rods and away you go,that allows some scope to put food on the table too!
speed costs money some may say,fair enough,but what about fuel efficiency consideration for the enviroment,promote the epa legal
concept with the big ci engine kits,spread the good word+ ye may very well get the epa on your side for a change?
with goverment assisted fundings.

 

I have this:
Eagle 4.000" Crank
Eagle 6.125" Rods
Mahle 4.000" Pistons

402ci Displacement

 

then make more money.

speed = $$$

always has, always will

 

obviously

but not everytime

 

good way to bring back an old thread