LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Piston?

Old Mar 4, 2011 | 07:00 PM
  #1  
henry172's Avatar
Thread Starter
TECH Enthusiast
iTrader: (2)
 
Joined: Jul 2006
Posts: 533
Likes: 1
Default Piston?

I ordered a set of these pistons for my 355 lt1 build http://www.summitracing.com/parts/TRW-8KL2256F30/, but the guy that is balancing my motor says they are too darn heavy so I am going to exchange them and pay a little extra for these http://www.summitracing.com/parts/SLP-L2490F30/; they are supposedly lighter than the stock pistons. I am wondering if they are higher compression or lower than the pistons I originally ordered.
Reply
Old Mar 4, 2011 | 07:32 PM
  #2  
jester1614's Avatar
TECH Resident
iTrader: (13)
 
Joined: Nov 2005
Posts: 782
Likes: 0
From: west phx
Default

those second pistons will be higher compression than the first ones, cause they have a 3.4 cc dish as opposed to a 6.1 cc dish
Reply
Old Mar 4, 2011 | 07:40 PM
  #3  
henry172's Avatar
Thread Starter
TECH Enthusiast
iTrader: (2)
 
Joined: Jul 2006
Posts: 533
Likes: 1
Default

O.K that's good I want to keep the compression high. Could someone help me estimate what the compression would be with lt1 le1 heads, stock rods, stock crank and a .026" thick head gasket.
Reply
Old Mar 4, 2011 | 07:47 PM
  #4  
stryker1320's Avatar
Staging Lane
15 Year Member
iTrader: (3)
 
Joined: May 2008
Posts: 91
Likes: 0
From: Muncie Dragway....Indiana
Default

There is a link to a compression calculator on the same page of the pistons that you referred to....
Reply
Old Mar 4, 2011 | 07:50 PM
  #5  
henry172's Avatar
Thread Starter
TECH Enthusiast
iTrader: (2)
 
Joined: Jul 2006
Posts: 533
Likes: 1
Default

Thanks, don't know how I missed that one.
Reply
Old Mar 4, 2011 | 08:00 PM
  #6  
henry172's Avatar
Thread Starter
TECH Enthusiast
iTrader: (2)
 
Joined: Jul 2006
Posts: 533
Likes: 1
Default

It is coming out to 11.84:1; I think I will be fine on 91 octane, what is the highest compression I could run on 91 octane and drive it daily?
Reply
Old Mar 4, 2011 | 08:24 PM
  #7  
gregrob's Avatar
TECH Senior Member
iTrader: (8)
 
Joined: Sep 2008
Posts: 5,130
Likes: 4
From: 6,000+ feet
Default

Originally Posted by henry172
It is coming out to 11.84:1; I think I will be fine on 91 octane, what is the highest compression I could run on 91 octane and drive it daily?
SCR isn't what determines octane limits, what ate your cam specs, DCR, cranking compression?
Reply
Old Mar 5, 2011 | 09:56 AM
  #8  
gjohnsonws6's Avatar
TECH Fanatic
15 Year Member
Liked
Loved
Community Favorite
iTrader: (12)
 
Joined: Aug 2009
Posts: 1,127
Likes: 156
From: Litchfield Park AZ
Default

the 2256 will work if you want to save yourself a few bucks.Of course it will need to be re balanced,no mallory metal is needed.only welding up some of the holes on the throws is all it takes.Someone is just being hard headed with you...
Reply
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

 Verdad Gallardo
story-1

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-2

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-3

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
story-4

Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

 Verdad Gallardo
story-5

Awesome K5 Blazer Restomod Comes With C7 Corvette Power

 Verdad Gallardo
story-6

10 Camaros You Should Never Buy

 
story-7

10 LS Engine Myths That Refuse to Die

 Verdad Gallardo
story-8

Five Reasons the Camaro Was the Most Pivotal Player in the Pony Car Wars 2.0

 Brett Foote
story-9

10 Reasons the LS7 Is GM's Most Extreme Naturally Aspirated V8 Engine Ever

 Verdad Gallardo
Old Mar 5, 2011 | 10:02 AM
  #9  
speedracer2536's Avatar
TECH Resident
iTrader: (15)
 
Joined: Dec 2007
Posts: 751
Likes: 0
Default

Im curious as to why your engine builder told you they were too heavy.. Im running the speed pro forged 4.030 pistons and they balanced out just fine..
Reply
Old Mar 5, 2011 | 10:18 AM
  #10  
gjohnsonws6's Avatar
TECH Fanatic
15 Year Member
Liked
Loved
Community Favorite
iTrader: (12)
 
Joined: Aug 2009
Posts: 1,127
Likes: 156
From: Litchfield Park AZ
Default

Someone is being lazy and hard headed
Reply
Old Mar 5, 2011 | 10:39 AM
  #11  
gregrob's Avatar
TECH Senior Member
iTrader: (8)
 
Joined: Sep 2008
Posts: 5,130
Likes: 4
From: 6,000+ feet
Default

They are heavy...
Reply
Old Mar 5, 2011 | 11:09 AM
  #12  
speedracer2536's Avatar
TECH Resident
iTrader: (15)
 
Joined: Dec 2007
Posts: 751
Likes: 0
Default

Well ya they are heavy but idk y they wouldnt balance
Reply
Old Mar 5, 2011 | 11:38 AM
  #13  
ThreeHonks's Avatar
TECH Resident
iTrader: (10)
 
Joined: Oct 2008
Posts: 823
Likes: 0
From: DetroitRacing.com
Default

take your stuff to a different machine shop. If he really cant balance a rotating assembly, then you need to go somewhere else
Reply
Old Mar 5, 2011 | 12:02 PM
  #14  
gregrob's Avatar
TECH Senior Member
iTrader: (8)
 
Joined: Sep 2008
Posts: 5,130
Likes: 4
From: 6,000+ feet
Default

Ya "wont balance " is bs. I would choose a different piston though. LT people must think it's a sin to use anything besides SRP or Speed Pro. There's a reason its the cheapest forged stuff you can find.
Reply
Old Mar 5, 2011 | 02:35 PM
  #15  
henry172's Avatar
Thread Starter
TECH Enthusiast
iTrader: (2)
 
Joined: Jul 2006
Posts: 533
Likes: 1
Default

Yes he said he could balance it, but it will cost me more to balance and would not run as wall as the others he recommended. He also commented on the friction the first pistons will put on the cylinder.
Reply
Old Mar 5, 2011 | 02:36 PM
  #16  
RamAir95TA's Avatar
TECH Senior Member
iTrader: (2)
 
Joined: May 2005
Posts: 9,467
Likes: 8
From: South Jersey
Default

They are a reliable budget piston and 99% of the people on this forum don't need a super lightweight piston, nor would they be even able to tell the difference. Tons of guys are going fast with them, including myself. It's not a sin to use what's less expensive and equally as dependable as pistons twice their cost.

I suppose it's more personal preference, but I chose them in my build for their reliable track record and see great results.
Reply
Old Mar 5, 2011 | 02:41 PM
  #17  
henry172's Avatar
Thread Starter
TECH Enthusiast
iTrader: (2)
 
Joined: Jul 2006
Posts: 533
Likes: 1
Default

Originally Posted by RamAir95TA
They are a reliable budget piston and 99% of the people on this forum don't need a super lightweight piston, nor would they be even able to tell the difference. Tons of guys are going fast with them, including myself. It's not a sin to use what's less expensive and equally as dependable as pistons twice their cost.

I suppose it's more personal preference, but I chose them in my build for their reliable track record and see great results.
What speed pro pistons did you use the 2256?
Reply
Old Mar 5, 2011 | 02:47 PM
  #18  
RamAir95TA's Avatar
TECH Senior Member
iTrader: (2)
 
Joined: May 2005
Posts: 9,467
Likes: 8
From: South Jersey
Default

I was specifically talking about SRP pistons, not Speed Pros (per gregrob's post).
Reply
Old Mar 5, 2011 | 02:51 PM
  #19  
henry172's Avatar
Thread Starter
TECH Enthusiast
iTrader: (2)
 
Joined: Jul 2006
Posts: 533
Likes: 1
Default

SRP'S are just fine; is anyone running the SLP-L2490F30 pistons?
Reply
Old Mar 5, 2011 | 03:23 PM
  #20  
speedracer2536's Avatar
TECH Resident
iTrader: (15)
 
Joined: Dec 2007
Posts: 751
Likes: 0
Default

I dont see anything wrong with the speed pro's either.. I have run them in several other motors and they have never failed.. I plan on hitting my motor now with a 200 shot with the speed pro's
Reply

Thread Tools
Search this Thread

All times are GMT -5. The time now is 09:55 AM.

story-0
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-1
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-2
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-3
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE
story-4
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.

By Verdad Gallardo | 2026-03-23 18:53:41


VIEW MORE
story-5
Awesome K5 Blazer Restomod Comes With C7 Corvette Power

Slideshow: A heavily reworked 1972 K5 Blazer swaps its off-road roots for a low-slung street-focused build with modern V8 power.

By Verdad Gallardo | 2026-03-09 18:08:45


VIEW MORE
story-6
10 Camaros You Should Never Buy

Slideshow: There are thousands of used Camaros on the market but we think you should avoid these 10

By | 2026-02-17 17:09:30


VIEW MORE
story-7
10 LS Engine Myths That Refuse to Die

Slideshows: Which one of these myths do you believe?

By Verdad Gallardo | 2026-01-28 18:10:11


VIEW MORE
story-8
Five Reasons the Camaro Was the Most Pivotal Player in the Pony Car Wars 2.0

The world was a better place when it was still around.

By Brett Foote | 2026-01-23 09:20:37


VIEW MORE
story-9
10 Reasons the LS7 Is GM's Most Extreme Naturally Aspirated V8 Engine Ever

Slideshow: The 7.0-liter LS7 was designed for absolute cutting-edge performance.

By Verdad Gallardo | 2026-01-07 18:36:00


VIEW MORE