Improved coolant flow to #2 and #3 exhaust valves
Originally e-mailed to me by "RallyBob" Legere
I have found that by simply adding a couple holes to the stock head gasket, I can lower the exhaust temps of #2 and #3 by about 150 degrees. I do this to all my Opel head gaskets, matter-of-factly.
I cut two 3/8" holes at this area only. To locate these holes, lay the gasket on the head, and tap the gasket with a soft hammer right at the triangular-shaped water passage holes on either side of the head bolt hole beneath the center exhaust ports. Then in the center of these indentations you just made in the gasket, punch out the aforementioned 3/8" holes. I use a gasket punch.
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