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Best head gasket 418 cid help!

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Old Oct 18, 2013 | 01:00 AM
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Default Best head gasket 418 cid help!

What is the best heads gasket thikness for ls3 418 na to get max rwhp ? Or to get correctly cr ?

Mods:
418 cid 4.080" bore 6.125" rod length 4" crank
Heads prc 250 cc 68 cc
Cam 239/255 624/624 lsa114
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Old Oct 18, 2013 | 02:07 AM
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I have .040 head gaskets on mine. It all depends on what you want the quench and compression to be.
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Old Oct 18, 2013 | 03:06 AM
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Originally Posted by LS1MCSS
I have .040 head gaskets on mine. It all depends on what you want the quench and compression to be.
Exactly i dont know but i want the best cr to get a good gain at same time be in safe side p/v
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Old Oct 18, 2013 | 05:19 AM
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Remember the piston sticks out of the hole around .010 so I would not go less then .040.
Under high revs, there's gonna be a little more sticking out of the hole !
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Old Oct 18, 2013 | 06:02 AM
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Originally Posted by EvenSteven
Remember the piston sticks out of the hole around .010 so I would not go less then .040.
Under high revs, there's gonna be a little more sticking out of the hole !
So what u think is better ?!!
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Old Oct 18, 2013 | 07:04 AM
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Depends on the dimensions of the engine. I ran ls7 gaskets on mine.

Tim
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Old Oct 18, 2013 | 09:30 AM
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Ive never had a aftermarket piston stick past the deck on a LS engine?
Maybe im missing something ,or wasnt decking the block enough?

Unless you check your individual engine deck height ,asking advise isnt the safest way to get it figured out.
As well as was mentioned, the quench,area will vary depending on your specific combo.
Any MLS gasket will work as long as the block and head surfaces are true
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Old Oct 18, 2013 | 09:57 AM
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Again like I posted in you other thread, you are not giving enough info. You don't know what piston is in the motor and you are hell bent on throwing those heads and cam in not knowing if you will make more power or not.

Pull your motor apart first and see what you have then go from there. I know you won't do that though. You'll just throw whatever gasket we say with those heads and camshaft.
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Old Oct 18, 2013 | 10:24 AM
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Originally Posted by 87silverbullet
Again like I posted in you other thread, you are not giving enough info. You don't know what piston is in the motor and you are hell bent on throwing those heads and cam in not knowing if you will make more power or not.

Pull your motor apart first and see what you have then go from there. I know you won't do that though. You'll just throw whatever gasket we say with those heads and camshaft.
Looool !! Not like what u think i really want to get what u will say to me , as before i told u that is my piston is 4.080 -3 valve reliefs rod is 6.125 crank is 4" .

What else u want i will give u ?
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Old Oct 18, 2013 | 10:59 AM
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4.100 bore .040 cometic
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Old Oct 18, 2013 | 07:34 PM
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Originally Posted by 87silverbullet
4.100 bore .040 cometic
U mean .040 gasket for 4.100
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Old Oct 26, 2013 | 12:53 PM
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Any help ??
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Old Oct 26, 2013 | 01:41 PM
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You need to know where the piston is at in relation to the deck height.

Without this dimension it is nothing more than a guess

Tim
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Old Oct 27, 2013 | 02:30 PM
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Ok i will measure it but do u have any steps or links explain how can i do it and what tools can i use for measurment ?
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Old Oct 27, 2013 | 04:25 PM
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Build sheet

Deck height, piston spec, rod length, crank stroke

Tim
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Old Oct 28, 2013 | 06:42 PM
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Originally Posted by Gray86hatch
Build sheet

Deck height, piston spec, rod length, crank stroke

Tim

Deck height
Stock ls3 block 9.240"

Piston spec
Flat 4.080" with -3 valve reliefs

Rod length
6.125"

Crank stroke
4"
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Old Oct 28, 2013 | 06:45 PM
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You need a actual deck height measurement. Also a comp height on the piston. Full specs from the build sheet should have all this info.

Tim
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