Piston Selection???
Thread Starter
Launching!
iTrader: (1)
Joined: Mar 2008
Posts: 255
Likes: 0
From: Houston/Humble Texas
Piston Selection??? Ordering a 408ci rotating assembly for my 6.0 liter. How do I know which pistons to choose? Flat top, dished, domed, +/- cc?
Not a car noob, just a noob at putting a LS engine together from scratch. This is going into my 72 Chevelle...replacing the 454 that's currenty in there.
What I have selected so far. Just clueless as to the benefits of choosing a different pistion.
6.0 LQ9 Block
Lunati Forged Crank
Lunati 6.125" H Beam forged rods w/ARP 2000 bolts
Mahle 4.03 -4cc flat top?????
Clevite coated main/rod bearings
TSP Stage 2.5 Head and MS3 Cam
Not a car noob, just a noob at putting a LS engine together from scratch. This is going into my 72 Chevelle...replacing the 454 that's currenty in there.
What I have selected so far. Just clueless as to the benefits of choosing a different pistion.
6.0 LQ9 Block
Lunati Forged Crank
Lunati 6.125" H Beam forged rods w/ARP 2000 bolts
Mahle 4.03 -4cc flat top?????
Clevite coated main/rod bearings
TSP Stage 2.5 Head and MS3 Cam
Depends on what compression ratio you're looking for. I have a little spreadsheet I built when I'm spec'ing that stuff out, but there are plenty of online calculators to help you get close.
Thread Starter
Launching!
iTrader: (1)
Joined: Mar 2008
Posts: 255
Likes: 0
From: Houston/Humble Texas
I'm not looking for anything radical. Just a stout motor pushing around 500ish to the wheels on pump gas. No power adders in the immediate future just yet.
Is my current piston selection okay? Would Wiseco 4.03" -3.0cc flat tops also be okay?
Thanks
Is my current piston selection okay? Would Wiseco 4.03" -3.0cc flat tops also be okay?
Thanks
Last edited by novajess1972; May 22, 2013 at 02:05 PM.
11.75 is perfect, that will give you free hp and tq. I'm 12.25 on 93
But what 2.5 head do you have or planning on getting? The 5.3/6.0/Ls6? They vary combustion sizes. If you have them already what is your chamber size?
But what 2.5 head do you have or planning on getting? The 5.3/6.0/Ls6? They vary combustion sizes. If you have them already what is your chamber size?
A dish and a small chamber is best as far as the combustion chamber is concerned, but that doesn't mean you should mill a stock 5.3L head to get the smallest chamber instead of better heads that have bigger chambers.
You need to get a realistic idea of what heads you plan to run before you decide on a piston.
You need to get a realistic idea of what heads you plan to run before you decide on a piston.
Trending Topics
Thread Starter
Launching!
iTrader: (1)
Joined: Mar 2008
Posts: 255
Likes: 0
From: Houston/Humble Texas
Directly from TSP website:
Precision Race Components LQ9/6.0L 72cc Stage 2.5 Cylinder Heads Fully CNC Ported & Assembled With Stainless Steel 2.02" Intake Valves, 1.57" Exhaust Valves, & PRC Dual Valve Spring Kit with Titanium Retainers, Rated to .650" Lift. Kit Also Includes TSP Hardened Pushrods & Your Choice Of Camshaft!!
Precision Race Components LQ9/6.0L 72cc Stage 2.5 Cylinder Heads Fully CNC Ported & Assembled With Stainless Steel 2.02" Intake Valves, 1.57" Exhaust Valves, & PRC Dual Valve Spring Kit with Titanium Retainers, Rated to .650" Lift. Kit Also Includes TSP Hardened Pushrods & Your Choice Of Camshaft!!
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo With 72cc chambers and a
4.0 bore
4.0 stroke
.051 compressed GM mls gasket w/ 4.02 bore size
Flat top pistons
"0" deck height but its never that
I came up with 10.97
I used this calculator
http://www.wallaceracing.com/cr_test..._redirect=true
If I were you IMHO I'd get a piston with like a -4cc valve reliefs for Ls1/2/6 style
Like these http://www.texas-speed.com/p-1108-ma...00-stroke.aspx
Then you can check ptv clearances and mill the heads to an 11.5/11.75 for some nice free TQ for your ride. TSP I'm sure can tell you how much to mill, I'm sure they've done this many many times. Just my .2
4.0 bore
4.0 stroke
.051 compressed GM mls gasket w/ 4.02 bore size
Flat top pistons
"0" deck height but its never that
I came up with 10.97
I used this calculator
http://www.wallaceracing.com/cr_test..._redirect=true
If I were you IMHO I'd get a piston with like a -4cc valve reliefs for Ls1/2/6 style
Like these http://www.texas-speed.com/p-1108-ma...00-stroke.aspx
Then you can check ptv clearances and mill the heads to an 11.5/11.75 for some nice free TQ for your ride. TSP I'm sure can tell you how much to mill, I'm sure they've done this many many times. Just my .2
