Slant Six Forum :: How high should I go?

Wow that is a lot of difference in sea level. Shoot for 9 to 1 with a steel shim head gasket. Then if you need less compression use a felpro or other composite head gasket.
My02.
Frank
PS the Megasquirt II will help a whole lot.

I don't belive any of the local parts places have steel shim gaskets... Where would I find one?

Quote:

I don't belive any of the local parts places have steel shim gaskets... Where would I find one?

I have the steel shim gaskets in stock. They are the original Mopar head gasket part number 2843182. If you want any send me a PM.

Is there anything I should know about using steel shim head gaskets? Lifespan, durability, heat, or other issues? I know that they're rarely used today, so, I'm assuming there's some reason for that.

Quote:

Is there anything I should know about using steel shim head gaskets? Lifespan, durability, heat, or other issues? I know that they're rarely used today, so, I'm assuming there's some reason for that.

They are not as forgiving as the thicker gaskets, if the head and/or deck are not flat.

TBI fuel injection (not port injected, throttle body), using a Megasquirt 2, distributorless ignition ( EDIS system), no headers, super six intake

Author:	65CrewCabPW [ Thu Dec 30, 2010 9:40 pm ]
Post subject:	How high should I go?
Ok, I'm not putting a cam in my slant for now, but since I have to redo the head, I'm definitely going for higher compression. I'm going to be using TBI fuel injection (not port injected, throttle body), using a Megasquirt 2, distributorless ignition ( EDIS system), no headers, super six intake, and it's a 76 engine. No air ports on the head. So, how high should I bump this up? I need it to run on regular gas. It will be used anywhere from 900 ft above sea level to 8000 ft above sea level. Your input appreciated.

Author:	Fopar [ Thu Dec 30, 2010 10:56 pm ]
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My guess would be no more than 9 to 1. Richard

Author:	raPoM [ Fri Dec 31, 2010 12:18 am ]
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13.5 to 1 and just run a NOS octane booster

Author:	Charrlie_S [ Fri Dec 31, 2010 5:06 am ]
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In a car, I would say about 9.0 to 9.2 to 1. In a truck that will be loaded, I would guess about 8.7 to 9.0 to 1. These would be actual measured values. You will probably have to recurve you distributor to go along with this.

Author:	66aCUDA [ Fri Dec 31, 2010 5:18 am ]
Post subject:
Wow that is a lot of difference in sea level. Shoot for 9 to 1 with a steel shim head gasket. Then if you need less compression use a felpro or other composite head gasket. My02. Frank PS the Megasquirt II will help a whole lot.

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Author:	65CrewCabPW [ Fri Dec 31, 2010 6:00 pm ]
Post subject:
Quote: Wow that is a lot of difference in sea level. Shoot for 9 to 1 with a steel shim head gasket. Then if you need less compression use a felpro or other composite head gasket. My02. Frank PS the Megasquirt II will help a whole lot. I don't belive any of the local parts places have steel shim gaskets... Where would I find one? Also, how does the MS help? I know I have to come up with timing curves for this thing, but is there some advantage beyond a carb? I do not intend to have WOT enrichment...

Author:	66aCUDA [ Fri Dec 31, 2010 6:21 pm ]
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Charrlie S has them in stock I am currently out but will have 30 or so in about 3 weeks. Frank

Author:	Charrlie_S [ Sat Jan 01, 2011 6:36 am ]
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Quote: I don't belive any of the local parts places have steel shim gaskets... Where would I find one? I have the steel shim gaskets in stock. They are the original Mopar head gasket part number 2843182. If you want any send me a PM.

Author:	65CrewCabPW [ Sat Jan 01, 2011 12:40 pm ]
Post subject:
Quote: Quote: I don't belive any of the local parts places have steel shim gaskets... Where would I find one? I have the steel shim gaskets in stock. They are the original Mopar head gasket part number 2843182. If you want any send me a PM. Is there anything I should know about using steel shim head gaskets? Lifespan, durability, heat, or other issues? I know that they're rarely used today, so, I'm assuming there's some reason for that.

Author:	Charrlie_S [ Sun Jan 02, 2011 6:09 am ]
Post subject:
Quote: Is there anything I should know about using steel shim head gaskets? Lifespan, durability, heat, or other issues? I know that they're rarely used today, so, I'm assuming there's some reason for that. They are not as forgiving as the thicker gaskets, if the head and/or deck are not flat.

Author:	Rug_Trucker [ Sun Jan 02, 2011 10:36 am ]
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Do you retorque with the steel ones Charlie? Or use copper spray?

Author:	65CrewCabPW [ Sun Jan 02, 2011 11:23 am ]
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Quote: Quote: Is there anything I should know about using steel shim head gaskets? Lifespan, durability, heat, or other issues? I know that they're rarely used today, so, I'm assuming there's some reason for that. They are not as forgiving as the thicker gaskets, if the head and/or deck are not flat. I'm not pulling the motor, or tearing it down. I am going to work on the head, though, and have it milled. Since I'm going be tough on this motor ( work hard, get hot, etc) I'm wondering if that's wise. I would have no question if I had the option of decking the block to true it up. No, the gasket's not blown now, but I do know that sometimes they aren't all that flat... What do you think?

Author:	Charrlie_S [ Sun Jan 02, 2011 2:43 pm ]
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You should not have any problem. I am running them on my motors, and the decks have not ever been cut, and untill I installed the milled head on my Valiant, the head was not cut either. I use Copper spray on the gasket, and I do retorque. The factory manual does not say anything about retorque, but I do it. I also retorque the felpro gaskets.

Author:	65CrewCabPW [ Sun Jan 02, 2011 2:46 pm ]
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Much appreciated.

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Author:	/6 Matt [ Sun Jan 02, 2011 3:00 pm ]
Post subject:	Re: How high should I go?
Quote: TBI fuel injection (not port injected, throttle body), using a Megasquirt 2, distributorless ignition ( EDIS system), no headers, super six intake If your not using headers, you'll either want to open up the bottom and the ports of your manifold and run 2 1/4" exaust or go with dutra duals. Else your leaving alot of performance on the table with this setup...