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Old 01-18-2008, 10:52 PM
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Rebuilding Cylinder Head Info?

Hi there,

I'm currently porting and a set of heads.I'm wondering about
re cutting the valve seat myself?

If the seats and valves aren't damaged should I just lap them or recut them?
Coming from a budget point of view,this is just a crappie set of heads getting
cleaned up and smoothed.Practice for my first time.

If anybodys has done it them selfs what brand or type of tool did you use?
I've seen some seat cutters on certain web sites and there pretty costly.

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Old 01-19-2008, 06:30 AM
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heads

It all depends on how redneck you want to get on them....L.O.L.

If the seats are in good shape, ( i have never seen a set of chevy heads with more then 5,000 miles on them that didn't need at the minimum the center exhaust seats cut) then you can just lap them.

What you could do is spring for a set of new valves. They are really not that costly, then lap all the seats to see what they look like. If they need cut run them to the machine shop and have the guy just dress the seats. That is going to be cheeper then buying any typ of tool to do it at home.

If you plan on doing more heads and getting into the valve job deal, look on e-bay for a stone set.

I will say this,,,,,If this is your first time porting heads you are, at some point going to drag the burr across the seat, and then they are going to need cut anyway....


Keith
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Old 01-19-2008, 11:18 AM
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If the seats don't have too much pitting you can just lap them. you can chuck the valve in a drill press after and back cut it with a file.
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Old 01-19-2008, 11:43 AM
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i ported my own heads, vortec's. and i didn't touch a seat.
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Old 01-19-2008, 12:54 PM
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The first time I tried to port a set of heads I didn't hit the seat with the stone, I hit it with the collet. All I can say is, I am glad they were junk heads that I was practicing on.
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Old 01-19-2008, 12:55 PM
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Quote:
Originally Posted by fiscus
If the seats don't have too much pitting you can just lap them. you can chuck the valve in a drill press after and back cut it with a file.

WOW and every back cut will be the same HMMMMMMMMM
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Old 01-19-2008, 02:04 PM
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Quote:
Originally Posted by CNC BLOCKS N/E
WOW and every back cut will be the same HMMMMMMMMM


My drill press table has a protractor scale built into it so you can set it to whatever angle you want. I used the method from here: http://www.diyporting.com/angles.html

This is definatly not the professional way to do it but it does work if you have lousy old valves with a big ridge on em.
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Old 01-19-2008, 03:57 PM
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Quote:
Originally Posted by fiscus


My drill press table has a protractor scale built into it so you can set it to whatever angle you want. I used the method from here: http://www.diyporting.com/angles.html

This is definatly not the professional way to do it but it does work if you have lousy old valves with a big ridge on em.
Just when I think I've seen it all!!!
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Old 01-19-2008, 05:55 PM
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WOW!

I wonder if a Core-Bore machine would line bore/hone?

What kind of runout/tolerance does that drill press run?
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