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5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

Questions on milling my gt40s

Old 01-28-2007, 12:25 AM
  #1  
5speed GT
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Join Date: Feb 2006
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Default Questions on milling my gt40s

I found the problems I was having was a blown head gasket. I pulled both heads off to replace them. I'm going to cut them down some to raise the compression up from 8.8:1

My questions are...

If I cut the heads down from 65.5cc to 62-63cc will I have a problem using the factory push rods?

next quesiton, dont flame me too bad,

I am happy running 87 octane, I also ran 87 in it when I had the stock e7's on it with 9:1 compression. If I decided to go a little further with it and cut them to 60cc, could I still burn 87 in it with 12 degrees or so of timing?

thanks guys
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Old 01-28-2007, 01:15 AM
  #2  
AdderMk2
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Default RE: Questions on milling my gt40s

ORIGINAL: 5speed GT

I found the problems I was having was a blown head gasket. I pulled both heads off to replace them. I'm going to cut them down some to raise the compression up from 8.8:1

My questions are...

If I cut the heads down from 65.5cc to 62-63cc will I have a problem using the factory push rods?

next quesiton, dont flame me too bad,

I am happy running 87 octane, I also ran 87 in it when I had the stock e7's on it with 9:1 compression. If I decided to go a little further with it and cut them to 60cc, could I still burn 87 in it with 12 degrees or so of timing?

thanks guys
you will have to measure to check if the stock rods will still work, as it is unknown.... same with the fuel... youll just have to find out
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Old 01-28-2007, 03:59 AM
  #3  
89gtsleeper
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Join Date: Apr 2006
Posts: 335
Default RE: Questions on milling my gt40s

I think you should probably do 89 octane just to be safe... I think but am not positive that those pushrods will still be ok... although it may not be ideal,I don't think it will give you any fits.
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