Defined1983

iTrader: (20)

Right now I have JE pistons 194883 and I was only doing around 10 or 12# of boost with a D1SC procharger but since then i have upgraded to an F1-A and i'm wanting to run a lot more boost (25# or so). I was wondering which one of these brands of pistons i should go with. I want to have no issues at all and for them be able to handle that much boost with no problems. I also have stock heads right now and am going to be purchasing AFR 225's. I have a 99 ls1 trans am and it's been bored .20 over. I would also like to be in the 10.5:1 - 11:1 compression range. I'm guessing I will need the AFR 225's with 62CC?

KCS

iTrader: (20)

Either brand should be fine, they have both been proven to handle some ridiculous power. A bad tune will be about the only thing that will kill them.

007FJ

iTrader: (28)

I prefer JE, Venolia and Diamond over Wiseco. Can you get where you want on the JE's with some larger combustion chambers and maybe target 18 or so on the boost? The bigger heads will flow better too which will create lower boost compared (more flow) to your present set up.

My F1C was at 19#'s with a 3.7. I don't know that you can reasonably get to 25 without fighting a bunch of belt slip and general pain in the rear. I am at 364 cid btw.

Violence.z06

iTrader: (3)

CP pistons.

rotary1307cc

iTrader: (5)

Je was nice to work with on custom pistons

SCott5

iTrader: (40)

I have diamonds in my forged 347 and have no complaints

Meth Sled

iTrader: (1)

Wiseco's in quite a few projects with no issues.

Defined1983

iTrader: (20)

when all said and done i'll be taking it to sam miller so no problems with the good tune just want to make sure i'm getting pistons that can handle the abuse

allmotor1

Ive always liked wiseco but je is very good to.

Defined1983

iTrader: (20)

how much boost though and how long have you been using them?

what boost levels on these projects?

007FJ

iTrader: (28)

https://ls1tech.com/forums/forced-in...uild-pics.html

There is the original build on my engine...note the date.

Wes had it freshened up last year before I bought it due to it being run without an air cleaner. That didn't include any big components. Same block, pistons, rods, heads ect.

15 to 19#'s

rotary1307cc

iTrader: (5)

Lots of good shelf pistons out there

Manley is another

Defined1983

iTrader: (20)

any idea if i should just go with a 408 and upgrade from an F1-A to an F1-R procharger? i'd be able to make more boost by upgrading my head unit to the F1-R correct?

hanngmcgon

they have both been proven to handle some ridiculous power.

itsslow98

iTrader: (18)

JE, CP, Manley, Wiseco, Diamond etc will all handle abuse. 25 PSI and that compression I'd be more concerned with the keeping the heads sealed. Not to mention an aluminum block LS1 .020.

Defined1983

iTrader: (20)

yep. that's why i'm thinking about an iron lq4 or lq9 for a block. I'll be using arp bolts and gm ls9 head gaskets

Johnv

Use ARP studs and leave as much meat in the bores as you can.

Defined1983

iTrader: (20)

so does anyone know if i upgrade from an F1-A to an F1-R procharger if i'd be able to make more boost by upgrading my head unit to the F1-R?

Detoxx03

iTrader: (14)

They are rated for the same max psi but not sure why it matters. I'd much prefer making more power on less boost. It all will depend on how efficient/inefficient your setup is.

Mongoose350

iTrader: (1)

At 25# you need to look into rods as well.