Questions on milling my gt40s

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01-28-2007, 12:25 AM

5speed GT

3rd Gear Member

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Join Date: Feb 2006

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Posts: 664

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

01-28-2007, 01:15 AM

AdderMk2

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Join Date: Dec 2005

Location: Lil' Rhody

Posts: 22,376

RE: Questions on milling my gt40s

Quote:

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

01-28-2007, 03:59 AM

89gtsleeper

2nd Gear Member

Join Date: Apr 2006

Posts: 335

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.