Quote:
Originally Posted by Tim Ayers
Here's something to thinking about with those gaskets with the small round holes. A wise and respected engine builder told me this. Why would you want to restrict the water from leaving the block?
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No idea who the builder is, but couldn't disagree more. Why do you think they make the holes the size they do? Read flatheadmurre post, they are designed that way for a reason! If you look at the total area of all the water passages in the head you can see the volume of fluid they can handle. Making larger holes is just like short circuiting wiring. Yes, the original center holes were larger (the large holes are there mainly to help clean out of casting core, not for cooling), but later designs in head gaskets attempted to correct the overheating issues of the rear cylinders. Take a look at the head, what good is a larger gasket to match the block going to do? Also, see the corrosion where the older style gasket was used? By reducing the size of these center holes even further in later models, it is forcing more of the flow to the rear cylinders. You don't want the majority of the flow to go from the pumps straight through the center of the block and back to the radiator.