AutomagicLS1

iTrader: (18)

12622033

charleysheen

yeah thats what summit says, damnit

I wonder what the big bore guys are using, LS7 maybe? perhaps just aftermarket copper gaksets

LSevil1

My only regret is I wish these were around before my motor was built.
They hold great now with PRC stg. III truck heads. 22# numbers on c16 coming soon.

Edit: 317's

stock48

iTrader: (17)

What I really want to know is how well they are holding with factory heads like 317, or 243's. I ran 20~22 psi on my normal MLS GM truck gaskets a few times with no problem but was afraid to go past that. The LS9 gasket has 4 embossed O rings in it's layers where the older truck gasket has 2. That being the case it should be able to flex/ lift more before it looses seal.

Denali08

Does it fit stock bore LS1 with 317 heads?

turbo370supra

i aim to be about 1100 fly wheel. i would like to push it to 1200 fly wheel if the stock crank will hold it. im doing 1/8th mile racing

TurboAv

iTrader: (6)

Yes it will.

westtexasbuff

iTrader: (40)

Forged LS3 here with LSA heads, ARP head studs, and LS9 head gaskets. Hope to make 1000whp on e85.

gennex

iTrader: (1)

youll make 1000rwhp, under 20psi of boost with that setup. i did 988rwhp at 17psi through a th400 blowing through the converter.

Papa Wells

Ok, so will they work on a 408 4.030" bore?

BMF_Racing

iTrader: (6)

yes they will .... old thread.

Papa Wells

I know it is, didn't see another one that answered it although I didn't search very hard. Thanks for letting me know though.

Wicked69

I run them on a 180,000 mile LM7 5.3 with stock heads and have spiked to 30lbs of boost and ran 25lbs and haven't blown them. Currently have it turned down to 15lbs.

Papa Wells

How much are you putting down on 30lbs? That's awesome man.

runsfromdacops

i have them on my car and there holding fine at 875. but i will test them out at 1000+ here very soon

Slowhawk

iTrader: (12)

We use the reguler GM 5.7,6.2 and 7.0 gaskets with copper spray. No problems with them.

Mine is past 1000rwhp with the 7.0's. Held it under full load from 50-220mph no problem.

Gordon0652

iTrader: (4)

Glad I read this thread.

allout06

iTrader: (11)

im hoping to make 1000rwhp on an iron AES 390, twin turbo turbonetics 66/65's, 18-20psi, 93/meth through an M6 and a 9"... ill also be using these gaskets. just hope i can make my goal. what ya think?

stock48

iTrader: (17)

I've since been 26psi with 80mm on my lq4 with them. Truck made 936HP at 20 psi with 76mm. The 26psi was on a 34* dec night with -1000' Da so I know there was some power being made lol

dville_gt

iTrader: (5)

then why'd you make this post?