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Old 11-19-2015, 06:56 AM   #1
panteramatt
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Default Vanguard head mods

Thinking of pullin my 16hp briggs and moddin the heads. Should I mill them or run a metal gasket to bump compression? If a gasket which one? I want the highest I can run on 93. Any tips on porting them?
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Old 11-19-2015, 07:28 AM   #2
Morgan44
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Default Re: Vanguard head mods

Have them milled. Run stock graphoil gaskets. Porting is an art. You either need someone that knows what they are doing or a lot of time, patience, and very good direction.

What happened with the tappet?
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Old 11-19-2015, 09:25 AM   #3
panteramatt
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Default Re: Vanguard head mods

Haven't fixd it yet. Will let you know sat. I'm not looking at a complete port job just cleaning it up. Was thinking of roughing up the intake ports and polishing the exhaust and combustion chamber. How much should I get milled off?
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Old 11-19-2015, 03:52 PM   #4
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Default Re: Vanguard head mods

Most of the porting work on heads is cleaning up the rough surfaces, and smoothing out the hard angles. When in doubt, take less material. If you can make the surfaces smooth and the transition angles smoother it will flow better. Serious porting should only be done by someone with the abilities to measure the ports and duplicated them, and also must have the knowledge of how thick the walls of the ports are so you don't drill through them.
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Old 11-19-2015, 08:39 PM   #5
panteramatt
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Default Re: Vanguard head mods

Will saving the heads be better than running the thin headgaskets? I was told to run the gaskets cause milling the heads can cause clearance problems.
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Old 11-19-2015, 08:45 PM   #6
1989Marathon
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Default Re: Vanguard head mods

Mill the heads .060" and use Graphoil gaskets.
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Old 11-19-2015, 09:34 PM   #7
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Default Re: Vanguard head mods

Don, how do you know if the heads have been milled or not?
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Old 11-19-2015, 09:36 PM   #8
panteramatt
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Default Re: Vanguard head mods

Could you explain why milling is better than thinner gaskets?
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Old 11-19-2015, 09:39 PM   #9
1989Marathon
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Default Re: Vanguard head mods

Quote:
Originally Posted by slonomo View Post
Don, how do you know if the heads have been milled or not?
The heads have a specific height.
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Old 11-19-2015, 09:41 PM   #10
1989Marathon
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Default Re: Vanguard head mods

Quote:
Originally Posted by panteramatt View Post
Could you explain why milling is better than thinner gaskets?
The thinner gaskets are problematic at best. If I was building a race motor, that was taken apart after every race, and I had an unlimited budget, I'd go with the copper-coated gaskets.
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