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Lsx block 6 bolt heads and boost

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Old Feb 18, 2015 | 08:30 PM
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Default Lsx block 6 bolt heads and boost
Just checking in with everyone to see how much boost they have put through a lsx 6 bolt combo without pushing water/blowing head gaskets. I know the tune is important and I know people have seen 20 plus psi with 4 bolt set ups. Just trying to see how much more reliable a 6 bolt combo is in everyone's experience and what head gasket you ran.
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Old Feb 18, 2015 | 08:53 PM
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the lsx six bolt heads aren't much better than the oem ls7 castings. they are still a lightweight casting. we have seen 24 psi on the set on the COPO Super Stock engine. they seem to be holding ok using a cometic gasket. I personally don't think that setup would handle a whole lot more.
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Old Feb 18, 2015 | 09:00 PM
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Believe Mana made over 50#'s on a lsx 6 bolt BLOCK, with nice aftermarket heads.
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Old Feb 18, 2015 | 09:04 PM
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Four years 36 lbs never pushed a drop of water. Tons of passes.
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Old Feb 18, 2015 | 09:14 PM
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Originally Posted by LASTLS1
Four years 36 lbs never pushed a drop of water. Tons of passes.
Do you have a o ring block/head combo, copper head gaskets?
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Old Feb 18, 2015 | 09:17 PM
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Originally Posted by LASTLS1
Four years 36 lbs never pushed a drop of water. Tons of passes.
lol very nice.

I ran 30lbs for several years, never pushed water either.
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Old Feb 18, 2015 | 09:18 PM
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Originally Posted by Tiago
lol very nice.

I ran 30lbs for several years, never pushed water either.
What heads and head gaskets did you use?
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Old Feb 18, 2015 | 10:45 PM
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Originally Posted by 4bangermustang
Believe Mana made over 50#'s on a lsx 6 bolt BLOCK, with nice aftermarket heads.

we made 55 lbs of boost on Phil's LSX 438 with ETP LS7 heads, that was copper head gaskets and double orings
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Old Feb 19, 2015 | 06:29 AM
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Originally Posted by SHAWN@PRACETECH
we made 55 lbs of boost on Phil's LSX 438 with ETP LS7 heads, that was copper head gaskets and double orings
That's crazy! At what point would you put any o rings on the block?
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Old Feb 19, 2015 | 07:37 AM
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We had good luck with cometics at 35psi running 7.0@192-195, Going 200+ required the switch to copper though. Going 220+ better heads are required.
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Old Feb 19, 2015 | 08:56 AM
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Originally Posted by hellbents10
We had good luck with cometics at 35psi running 7.0@192-195, Going 200+ required the switch to copper though. Going 220+ better heads are required.
Love love love your car
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Old Feb 19, 2015 | 02:16 PM
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Originally Posted by dragrex
What heads and head gaskets did you use?
simple cometics, nothing special, old school ETP 255 6 bolt setup.
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