dizwiz24

I'm starting to think of rebuilding my 93 lt1...

It will be a reduced compression (9.5:1) for boost.

I envision a high cc head (like afr) so I can use as small as possible dish on the piston.

That said, does anyone make a lightweight dished piston?

What got me thinking about this is I read somewhere that lsx motors have stock cast piston weight around 430 grams. Whereas sbc and lt1 stock cast piston weights are around 525 grams. Much heavier.

Are there lighter weight forged pistons out there?

1963SS

How about Mahle. Here's a -16cc dish weight. It's pretty light.

racebum

mahle has a habit of creating pretty light street pistons. the things is, unless this is a track only car, you don't want an ultralight...as in lighter than an off the shelf mahle. the skirt is one place metal is taken and that means more flopping around in the cylinder especially when cold. if you plan on boosting this car and have a stock gm block you're going to be more hp limited in the block than you will be anything else....well....unless you use pump gas which i do not suggest, not with e85 so easy to find these days

the single most important thing in this whole build will be the tune. with turbo cars it's the #1 cause of engine failure.

the mahle pistons are also coated which reduces heat into the aluminum. heat = expansion = lager piston to wall clearance. they also happen to be 4032 alloy which expands less than 2618

probe is another very reliable piston that has been use in a TON of builds {also 4032 alloy}

you also want to use ductile iron or steel rings. no cast iron crap with added pressure. in fact, don't be cheap, buy tool steel, the last thing you want is fractured rings

dizwiz24

Mahle sounds like the right ones for me. Thanks for the advice

Geardo

" e85 so easy to find"

zero availability where I live

dizwiz24

I also didn't know the steel block of the ltx is a limiting factor.

Man, id hate to be modding an aluminum lsx motor then.

GREGGPENN

Look at these....
http://www.jepistons.com/Catalogs/SR...0_inv-pro.aspx

Their specs really impress me. 4032 alloy is what I chose for my street build too. Less expansion.

If they would have had the relief size I needed, these are what I would have used. (long story...not worth posting here.)

racebum

why? the LSx is stronger. you have 6 bolt crossbolted mains vs a plain iron cap two bolt. stock gm blocks usually will go south around the mains dash webbing area in the bottom end. you also have to run the mains loose in high hp apps, or at least i would suggest so, to prevent deflection and bearings getting hammered.

as for where the stock gm block fails? it's subject to debate. i have personally witnessed 700whp of precision turbo forced air in a 350 before all on a stock block with made in china eagle rods. i have no idea how long that would live but it had no problems the whole day i was watching the drags.

i think one reason gen 1 builds go dart north of 500hp is just how expensive parts start getting. no one wants to waste a $1500 crank, 600 dollar pistons and a nice set of rods with a cheap block coming apart.

cv67

in a boosted app you need a thicker crown sure there is a compromise with weight/strength. Sometimes with added strength comes weight just the name of the game. Wouldnt lose any sleep over it.