jub jub

If you were going to rebuild an LS6 and didn't plan any power adders such as nitrous, big cam etc., would it be better to go with the hyperutectic type pistons or go forged? Are forged pistons noisier after they warm up than the hypers?

gollum

iTrader: (1)

All OEM LS1/LS6 engines including mine are noisy at cold start up. What causes this noise I do not know. I bet forged pistons would be just as noisy or even noisier. Coating them may help.

My friends 1999 GMC Full size pickup truck knocks very loudly until fully warmed up.

slow95z

iTrader: (33)

dont waste the money on forged pistons if you dont need them. it would be like having slicks on a stock daily driver.

Hennytime

iTrader: (33)

piston slap

N4cer

iTrader: (11)

Put forged in. You might not plan on any power adder now, but plans change.

Oh and a cam isn't considered a power adder, by the way.

MARKSZ71

iTrader: (3)

they make more noise until fully warmed up

silver01z06

pianoprodigy

iTrader: (1)

If you have it apart, put forged pistons in there.

jub jub

Forged it is.

Will there be any HP loss over cast pistons?

mike#9

iTrader: (3)

The only downfall to having forged pistons is that you will be able to run more nitrous, more boost.....and make more horsepower. I would not recommend them.....

mr2guru

iTrader: (16)

A tighter piston to wall clearance and tighter ring gap will make a slight more amount of power. Something that the stock piston/rings will probably have. Nothing too noticeable though.

Irocss85

iTrader: (1)

forged parts are heavier, and you have to, as mentioned, use larger ring end gaps. if you know there is no way your gonna use nitrous, then go hyper., but, if you plan on selling the car down the road, or may want nitrous then spend the extra money now.

MARKSZ71

iTrader: (3)

i guess im the only one who believes forged pistons make are louder when cold lol

jub jub

If you guys wanted to buy a used Z06, would you want it with a stock (virgin) engine or a forged block built by a reputable tuner (I think I know what the answer will be with this crowd ) ?

SLPSS99

iTrader: (7)

A forged block by a reputable builder, but I love the bottle and would prefer a nice forged shortblock for a big shot of giggle juice!!

Dan

jub jub

I've never used the stuff but I hear it's got quite the mojo!

N4cer

iTrader: (11)

Don't forget, when talking about new parts, the stock pistons cost more than forged pistons.

Irocss85

iTrader: (1)

well Id answer as youd expect. but later down the road, if you were to sell the vette, Id think MOST potential buyers would frown on an aftermarket engine. Id be willing to guess the typical vette owner would not want the car modded in any way. and in there eyes, it would be worth less then with the orig. engine. know what I mean?

and yes, forged pistons will make more noise when cold due to thermal expansion. basically the forged pistons will grow as they heat up and not rock back and forth like they will when cold.

pianoprodigy

iTrader: (1)

Unless you plan on returning the car to BONE stock condition, I wouldn't worry about the people that would be concerned about forged v. stock crap pistons.

BOWTIE

I hate hypereutectic pistons so the answer for me is simple. Most forged pistons these day do not require nearly as much clearance as those of yesteryear. In fact the cheapo forged Sealed Powers for the gen 1 350's require the same min clearance as a stock replacement (.0015). Granted most shops frown on that and set them up a little looser. The main advantage to a hyp pistons is that they do not absorb heat as easily as a forged, but that can be corrected with a ceramic coated forged. Hyp pistons are quite brittle (at least they used to be when I was in the business) and were very prone to breaking when exposed to even mild detonation.