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Old 09-26-2016, 03:33 PM   #1
Chilm
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Question The 5 holes O O O O O

A question cuz I can't find much about it on the interweb:

Did one of you guy's drill the extra 5 holes in the head for better cooling like the "folk racing" guy's do in Sweden. And if so what are youre "findings", and if certainly not, why not.

It is my understanding that it will cool the back of the engine a lot better.
I did drill the 5 holes in an old head that I had laying around and it really does hit the passages so that for "practice". But... before doing that in my time and money consumed 531 head I must be sure it is worth doing it.

So...
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Old 09-26-2016, 04:14 PM   #2
Dan
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Is this for a scp head? (small coolant passage?) I thought those were only for a couple of early years, if its not, ignore this
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Old 09-26-2016, 04:53 PM   #3
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Nope, a 531 head.
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Old 09-26-2016, 05:16 PM   #4
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I only did the 2 rear most, I can't tell if it made any difference, I did just have to change a head gasket but not related to the holes that I can see.
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Old 09-28-2016, 01:35 AM   #5
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There was some info on it that is now hard to find. I read it all some time ago, was convinced, did drill one head, wish I had done the other.
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Old 09-28-2016, 06:37 AM   #6
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http://www.stonis-world.com/headwork.html
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Old 09-28-2016, 08:34 AM   #7
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Oh nice I finally found the right thread with Thomas chiming in: Click

Thank you all...
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