Higher compression, higher oil and coolant (water/anti-freeze)=20
pressures. Thermal and vibration movement between the cylinder head and=20
head. In particular when dissimilar materials like cast iron and=20
aluminum. Also today, two of the important design issues is vehicle=20
weight and quantity of material used. The gasket surfaces are smaller,=20
with smaller distances to seal say a pressure oil passage.

On 8/24/2010 5:41 PM, Chris McSweeny wrote:
> On Tue, Aug 24, 2010 at 6:40 PM, Jim Franklin<01942878604@talktalk.net>  =
wrote:
>   =20
>> I challenge you to do the same with a modern vehicle :D
>>     =20
> Why, do cylinder heads no longer work in the same way?
>
> Chris
>   =20
--=20
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