I am finally putting my motor back together but GE had to deck a lot off the block to square it up, so I am looking to gain a few thousandths with a thicker head gasket to drop the compression down to a driveable level.

Does anyone know where i can find one for my h23

 

Cometic, they make custom ones. I used an SCE copper one .043" says .040 in my sig, but it's .043. I used that and the 2 outer layers of the stock gasket. My pistons are made to be 11.0:1 with a .032" gasket and the 2 outer layers, but my head was crazy shaved and my block was decked as well. If you go that route I'd use some copper gasket sealer to be safe.

 

thanks for the info, I will prob have to do the same, as my head has been milled 50 and the block 30, the pistons are wiscos 14:1 ultralights (obviously I milled the top of the pistons) But it looks like the compression is still gonna be to high for pump gas

 

Nice!

 

kind of a newb question, but does compression ALWAYS lower with a thicker gasket? Can you get thicker ones that keep compression the same?

 

To keep the compression the same with a thick head gasket you you have to change something else. Like this guy is saying his block and head were resurfaced so he needs to get the thicker gasket to compensate to get it to where the pistons will yield 14:1. You could also change to high comp valves (ones that have a flat face rather than an concave one. You could also weld metal into the chamber...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 93ludeSi &raquo;</TD></TR><TR><TD CLASS="quote">as my head has been milled 50 and the block 30, the pistons are wiscos 14:1 ultralights (obviously I milled the top of the pistons) But it looks like the compression is still gonna be to high for pump gas</TD></TR></TABLE>

Jeez merry christmas... you weren't joking around when you said you had to mill your block/head. Running a thicker headgasket to compensate is a very good idea. Keep in mind ignition timing is going to be very vital for you so make sure you have your timing set dead on before going out and driving under heavy load.

 

Thats some huge compression....... just remember kids, if you go cometic HG's.... RE-torque 3times..... espically with boost or outrageous compression, like you.... even if you get 2 cooper gaskets and a OEM and make a sandwhich, I'd still re-torque and least twice........ also, about your compression, I don't think I'd run pump gas period on anything over 12.5:1...... plus you're gonna want to get a high performance ignition..... and like Gude said, make sure you have you're timing set properly.... or else you'll put that pretty piston into your pretty skinny head

sorry it looks like m following you anthony........ these are the only good threads at the moment

 

Yeah I had to turn my dist to full advance just to get to the stock 15deg. You're ignition timing will be retarted with all that milling.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by spoolinlude &raquo;</TD></TR><TR><TD CLASS="quote">sorry it looks like m following you anthony........ these are the only good threads at the moment</TD></TR></TABLE>

You are even trying to type like me! hahaha

Hey 93ludesi, what type of head work do you have done? If it is stock, I would recommend purchasing a new one... A mill of 50 thou is pretty damn extreme.

 

The head was milled to bump up compression before i built the bottom end, It has been spiral ported and polished, shotpeened valves double springs and all the titanium goodys, clay smith cams with JG gears, the IM has been port matched along with the JG throttle body, the secondaries and egr have been removed as well.

As for the pistons, they are wiscos 14:1 h22 pistons going into an h23, so the wristpin height is lowering compression. I though they were going to be about 30 in the hole but GE took a bunch off the deck, so thats why I am looking for the thicker gasket.

I got a number for MLH gaskets out of Ohio, they make a lot of different thicknesses sandwiched between two stanless steel pieces that are pre coated and need to be torqued only once.

P.S. i am looking to get static compresion down to about 11 - 11.5 :1 for 93 test

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by GudeH23a &raquo;</TD></TR><TR><TD CLASS="quote">

You are even trying to type like me! hahaha

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yeah that whole........ its a old......... habit