Calypso

iTrader: (1)

Hey guys, my 6.0L LQ4 went into the machine shop today. Its going 30 over, stock crank/ARP studs. What pistons would give me around 9.5cr considering:

1. Stock LQ4 deck height of 9.230 (not getting milled or decked)
2. Stock 3.622 stroke
3. 6.125 rods (thinking eagle h-beam)
4. Stock 317 heads (I think 317s are 71.06cc chamber?)
5. LS9 gaskets at .051 compressed thickness(right?)

Been looking through Wiseco, Diamond, JE, etc and just not sure quite what to order. Any recommendations with part numbers would be greatly appreciated. Sponsors feel free to PM me with prices too.

Side Note: Is my guess at 9.5cr appropriate for 93 pump gas? What about if I decide to go E85? My goal is to run something like a single PT7675 for 700rwhp street car. Thanks!!

67Firebird455

iTrader: (27)

Man, I'm surprised no one responded to this!

9.5:1 is great for 93 pump, and good boost numbers especially with meth. You'll be able to run a substantial amount of timing and boost with E85, but will need much larger injectors than you would for the same amount of power with gas (I'm sure you already know that).

That PT7675 is a great turbo for 700rwhp on a 370, I look forward to hearing more about this rig!

trigger man

I beat the hell out of wiseco pistons running over 35 lbs of boost in my old sb2 motor and they held up great.Based on that experience im sticking with them on my current project. Twin Turbo lq4 with 317 heads, going in a 62 Buick.

Beanslsxnova

iTrader: (1)

I have the same engine set up your trying to build. Im running diamond 11517 -15cc dished pistons and a set of 6.125 lunati h beams with arp2000 rod bolts. With ls9 head gaskets and stock 317 I'm right around 9:2:1. My car has be tuned on 93octane and meth for over a year and I DD it and beat the mess out of it. No problems what so ever

67Firebird455

iTrader: (27)

What kind of boost/power?

Beanslsxnova

iTrader: (1)

At this moment it's tuned at 18lbs and it made 668/701 through a th400 and a 9 inch.

I8UR4RD

iTrader: (16)

if you can afford it H beam ultra's or I beams from callies. I have seen a report of a guy bending the entry level h beam at 1900rwhp after several 1000+ rwhp runs before that. says alot about them IMO...and you cant beat diamond.

Calypso

iTrader: (1)

Hey man, I just noticed somebody finally responded to this thread! Anyway I got -3cc Wisecos and Molnar H-beams. Should give me around 9.8cr. I was leaning hard towards E85, mostly because of the extra safety against knock, with almost whatever timing/boost you put in it.... but already have brand new 80lb Siemans injectors - which probably won't be enough. So now a decision whether to buy 95s or go with 93/meth instead...

Now I'm looking at this turbo with either .96 or 1.15a/r
http://www.compturbo.com/products/ct43billet/ct43_7879

Also looking at this cam from a sponsor:
226/230 .585/.592 114+2LSA

Any ideas if thats a good match up? 3400 stalled 4L80e on street car.
Mine on the right..

Calypso

iTrader: (1)

How do you get 9.2cr with -15cc? I originally ordered -11cc Wisecos that calculated out to 9.0:1cr. I just decided to bump the cr a little bit for E85, so swapped them for -3cc instead.