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 Post subject: milling the head
PostPosted: Fri Nov 12, 2004 6:54 am 
i think i figured out the problem with the truck. the head gasket is blown. how much can be milled of the head safely?


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PostPosted: Fri Nov 12, 2004 7:04 am 
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Location: Colorado Springs
i would get a new head. these heads have zero tolorence. i don't think anyone here would suggest shaving the head.

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PostPosted: Fri Nov 12, 2004 8:32 am 
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Location: Medford, Oregon
If anything you zero deck the block (but I have always done that to V8 ). Never seen a zero decked 4 cylndr.

*for people who don't know what zero decking is*
the block is milled down (where the head(s) bolt on) so the pistons have like a .001-.005 clearence between them and the head(s). This keeps compression high and also lets your heads run cooler. your also saposed to get a hp gain, but I can't confirm that.

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PostPosted: Fri Nov 12, 2004 2:24 pm 
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Most of the aftermarket head gaskets are a tad thicker than stock to make up for taking a few thousandths off the head. If it is really bad, Felpro also makes a spacer, tho too much warp will cause the cam to bind even if it is shaved flat on the bottom. Some shops these days can heat and straighten aluminum heads nowdays though, so that may be an option if it is very bad. Here is a snip from the factory manual:

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With a straight edge and a feeler guage, check the lower face of the cylinder head for distortion at six points as shown in figure 6-50. (Shows straight edge bar on the head with a feeler guage slid under it) If the amount of distortion is more that 0.2mm (0.0078") but less than 0.4mm (0.0157) correct with a surface grinder. The cylinder head should be replaced if distortion is greater than 0.4mm (0.0157")


As for how much can you shave to add performance? Its not too much, but there is a little space in there. The valve to piston clearance goes down though, so floating the valves starts to become more of a problem. If a valve is still open at all when that piston comes up, it will hit it. You might look at http://www.hotgemini.com if you are really serious about squeeking every last bit of power out of that motor. They do some crazy stuff with Isuzu G180 motors in Holden Geminis down there.


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PostPosted: Fri Nov 12, 2004 8:44 pm 
The head on my truck has been shaved. 8)
When i get time I will try to find all the paperwork that pertains to my engine rebuild and share it on here...cause mine is one MEAN lil 4 cyl :!:
Today, I gave a customer a ride to the store in my truck (he is a LUV owner as well) and he was like "You got a V-6 in this thing'? (Cause it does sound more like a 6 than a 4 cyl).........Well, I wound up scaring the crap out of him 8O NOW...he wants HIS truck to run jus like mine :roll:
I told him "Ya need to start savin yer pennies" I have over $3 grand under my hood, for those of yall that don't know :lol: LOL!


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PostPosted: Fri Nov 12, 2004 9:04 pm 
I had mine surfaced and it was fine. bryan


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PostPosted: Sat Nov 13, 2004 1:02 am 
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Location: Eugene, OR
3k on the 1.8??!! Do you have some kind of issue with v8's, or just enjoy getting the 8O "WTF!?" look? Any idea what kind of numbers you're laying down? Even a ballpark??

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PostPosted: Sat Nov 13, 2004 12:38 pm 
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Location: McChord AFB WA by way of Spokane WA
i had mine milled enough to generate a 9:1 compression ratio. It gets to be a handfull sometimes though. I have to run a bigger radiator just to barely keep up and a lower presure cap so that when steam does build up its gone as fast as it shows up. Which in turn means i cycle alot of water through it. :o

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PostPosted: Sat Nov 13, 2004 8:53 pm 
1980Mikado wrote:
3k on the 1.8??!! Do you have some kind of issue with v8's, or just enjoy getting the 8O "WTF!?" look? Any idea what kind of numbers you're laying down? Even a ballpark??


F.Y.I.... mine is an all original 4x4, would not ,could not want a v8 8O
EVERYthing is balanced and blue-printed, this much of my paper work i read so far. The engine was dyno'd and I have that paperwork some where here as well, need to find all this stuff and when i do, will share every last bit of it w yall :wink: :D


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PostPosted: Mon Nov 15, 2004 9:31 pm 
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Location: Eugene, OR
sounds good

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PostPosted: Wed Nov 17, 2004 8:58 pm 
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800xl wrote:
if you are really serious about squeeking every last bit of power out of that motor. They do some crazy stuff with Isuzu G180 motors in Holden Geminis down there.


yeah ive seen a few gemini's kicken round all hotted up,

go the aussies! :P

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