Do thick decompression headgaskets flatten over time?
Feb 15, 2006 | 09:01 PM
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Do thick decompression headgaskets flatten over time?
Originally posted by: yjacket2001
When you don't want 12:1, 13:1, or 14:1 CR forged pistons and want less CR but still want the pistons, you have to get thicker head/base gaskets.
Anyone who has used thick head/base gaskets to reduce CR of new forged piston, for any length of time:
1. Do thick gaskets flatten significantly requiring frequent valve adjustment when retorque? How many valve adjustments did you experience per miles?
2. For a 10.5:1 CR, would you know how thick and what gasket material for HPR super forged piston?
3. Is there even a remote chance of valve/piston interference when thick gasket crushes over time?
Thanks for all of your expertise!!
When you don't want 12:1, 13:1, or 14:1 CR forged pistons and want less CR but still want the pistons, you have to get thicker head/base gaskets.
Anyone who has used thick head/base gaskets to reduce CR of new forged piston, for any length of time:
1. Do thick gaskets flatten significantly requiring frequent valve adjustment when retorque? How many valve adjustments did you experience per miles?
2. For a 10.5:1 CR, would you know how thick and what gasket material for HPR super forged piston?
3. Is there even a remote chance of valve/piston interference when thick gasket crushes over time?
Thanks for all of your expertise!!
1> Even if gaskets did settle or flatten it would not effect valve adjustment, valve adjustment will only be effected by valve and/or valve seat wear, no gaskets between any of the valve train parts from cam to shim to tappet to valve stem. Valve gap can be set on a bench before the head is even installed on the cylinder, and still be correct and uneffected by assembly of head to cylinder.
2> I don't know, but HPR can most likely answer that.
3> As long as the cams were designed to work with the piston at its normal CR without any thick gaskets, there would be no danger of this.
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