Just want to get some opinions on what you guys think of my forged 370 S475 build. Picking up a 6.0L shortblock friday. Heres the plan so far..
-Wiseco Flat top 4.030"K398x3 Forged pistons with 3.2cc valve relief
-Lunati 6.125 4340 Forged H beam rods
- Stock crankshaft
-stock 317s
-BTR .660 dual valve springs
-LJMS stage II turbo cam
-LS9 gaskets
-Alper motorsports head stud kit
-S475 cast T6 1.32 a/r

 

Your compression is going to be very high for a turbo build with those pistons

 

You're going to catch hell for the Chinese head studs. I run them. I will run them with boost. I know people running over 20lbs of boost with them. Just letting you know...

Also, I'd run a piston that would get me around 9.0 static comp. with the 317s. You can still make some power out of boost, and don't have to spray a shitload of meth.

 

If you or your tuner knows what they are doing you don't need low compression with boost

Just finished up a Twin 7665 on a 11.0 motor at 19 psi on 93

List ok but why spend all that money and skimp out on Chinese head studs? Those are an alternative for junk yard motors but motors you care about buy ARP



Now what is your goal for power?

 

I have true flat top lq9 pistons in my 6L with ported 317's. Comp worked out to 10.24 when I ran the numbers. Cast T4 S475 too. JFR triple 12 cam. 15lbs of boost on pump 93 and Meth netted me around 800rwhp. (5450 race weight, 11.0@125) A very nice setup I think.

 

Good to know as my 370 is very close to yours but specs out at 9.8cr with stock 317s.

 

I think that cam is a little on the small side...but that just means it'll run nice and still make big power lol.

I wouldn't be afraid of the compression...just make sure you've got a good tuner if you don't know how to do it well yourself.

 

Im running intercooled with E85 though. Didnt think the compression would be too big of a deal lol im mainly looking for something really torquey out of boost.

 

With E, I wouldn't even worry about it.

I'm 10.6:1 on E48 and seen 20 psi before, 16-17 routinely.

 

how do you guys feel about the lunati forged rods?