disassembled

iTrader: (3)

Here's the link:

https://ls1tech.com/forums/showthrea...=1#post3071208

Thanks
Greg

ddnspider

iTrader: (26)

damnit!why could you post this months ago,HPE is building my SB and that would have been perfect!

disassembled

iTrader: (3)

did you already buy heads? Are they still working on your motor?


Greg

ddnspider

iTrader: (26)

bought a set of stock ones about a month ago for $400 shipped.they're just sitting in the garage waiting for my motor to come

ddnspider

iTrader: (26)

they're still getting the parts for my motor.

99SS-T

iTrader: (5)

something that i never understood about getting these heads, why do you need them? When you have a stock motor you can make more power then the engine can handle, pistons and rods, so why do you need lower compression? It is the HP levels that break pistons and rods not compression levels. And once you go forged engine there is no need to change the compression with the heads as you can get any compression you want from the pistons. Hopefully yall cna help me understand lol.



John

ddnspider

iTrader: (26)

you have a couple things off,no offense.you lower the CR on a stock shortblock to help the motor last longer BECAUSE of the lower CR it puts less stress on the motor.In addition you can run more boost safely with a lower compression,so for those who have a stock shortblock and safely run, say 7psi,with a lower CR from the bigger combustion chambered 72cc heads, they can get away with 10psi.On a forged motor,you still are better off with larger combustion chambers to HELP lower the CR,idealy you dont want stock heads and the only thing you have to lower the CR is the dish on a piston or a thicker head gasket(which isnt recommended to go to thick because you'll blow it out).If youre only way to lower the CR to say 8:1(to run alot of boost) is by a dished piston,well then you need a HUGE dish which in tern makes parts of the piston very thin and can be succeptable to damaged easier.Dont think of the Lq9 heads as the way you fix your CR problem,think of them as a way to assist you in getting lower compression.make sense?

Z06PSI

iTrader: (33)

I wish you would have let me know when I wanted those injectors. We could have traded straight up. heads for injectors...

ddnspider

iTrader: (26)

i wish i knew you HAD them!

99SS-T

iTrader: (5)

Well I see what you are saying but i definatly dont understand. Are you saying that i can make the same power safer with less combustion? IE i can make more power safely? So if most people say that 500-550 is a safe # for a stock engine that if i change to these heads i can make more power just as safely? The way i look at it that is not correct as the rods dont give a **** what the compression is, they break at 550, guesstimation, weather it is 12-1 or 8-1. No?



John

Jaegermeister2k

iTrader: (5)

I'm not completely sure about this.But i beleve it's liek this.Lowering your compression ratio helps prevent detonation to a certain extent.And detonation will kill your motor.Weather you run 1000rwhp or 400rwhp.The heads WILL make less power then heads that give you a higher compression ratio at the same boost level.But you'll be able to run more boost because of the lower compression.Which means more power.
So if you're planning on not making alot of power.You should be fine with the stock heads,but if you're planning to make alot of power you'll need to lower your CR.8.5:1 i beleve is the optimum CR for any motor when going forced induction.
As for rods.Rods will handle the power as long as you don't rev them too high or put too much boost on em.Once you rev them high their lifespam will decrease quite alot.Same with boost.You can have a tiny turbo or a huge turbo.ALot it won't make a difference.Too much boost will kill em.

Like i said.I'm not completely sure about all that.But that's what i'm getting from hours of research on several boards.

BTW.disassembled.You have a PM.

Tiago

iTrader: (27)

the heads also flow better then normal LS1 heads.

ddnspider

iTrader: (26)

99SS-T youll notice i never said anything about the limit for hp on a stock shortblock.so im not sure where you came up with that.
Jaegermeister2k is correct about raising the detonation threshold,IE you make more power because instead of being limited to 7psi you can now run 10 for example which in turn makes more power.see what i mean now?And actually for a street car 9:1 CR is optimum as youll barely notice the difference from stock when not in boost.As for the rods,stock rods are good for over 500rwhp,its the rod bolts that kill em.

disassembled

iTrader: (3)

these heads are still for sale and Erik at HPE still has them. Anyone interested?



Greg

JMBLOWNWS6

iTrader: (17)

Hell how about $350 shipped since HPE is in a one day zone from me

disassembled

iTrader: (3)

these are still for sale


Greg

99SS-T

iTrader: (5)

Ok so if i were to get these what exactly EXTRA do i have to do/buy? I think you say that the seals need to be installed, is that somethign easy to do or is that something that a shop has to do. Thanks



John

Got Me SOM

iTrader: (2)

not hard at all, especially since they're out of the car, lol, however if those need to be replaced I'd go thru everything.

disassembled

iTrader: (3)

I would recommend going with the GM 6.0 MLS head gaskets, head studs, the GM big block springs + retainers, hardened pushrods, and a cam(optional ). HPE stocks the springs i am talking about and Erik has used them with great success as opposed to double springs. Erik at HPE can probably install the springs for a few bucks. These heads would be a sound investment. Talk to Erik at HPE about how much HP he recommends using the stock valve seats for if it's within your goals.

Greg

disassembled

iTrader: (3)

Anyone interested?



Greg