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Old 04-06-2004, 09:15 PM
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Cutting bigger valve seats

How exactly are valve seats cut? I know its beyond the scope of the average do-it-yourselfer. I've got some heads I've ported out and I'm thinking of putting in bigger valves at some point. I'm interested in machining and I'm curious to know what tools are used and stuff. In a few months I'm going to begin at a vocational training school to learn machining techniques, so I'd have lots of tools at my disposal and stuff.

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Old 04-07-2004, 12:59 AM
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Take a look at the Goodson Catalog. You should get a good idea what tools are available for head work and other stuff.

To answer your question though.....once the heads have been cleaned and checked for cracks, the valve guides need to be inspected - bad/loose guides will need to be replaced. If the exh. seats are in poor shape, now would be the time for hardened seats to be installed.

These days, even stock rebuilds are generally cut with a Serdi style '3-angle' cutter. It's easier for the machine shop and beneficial for the customer too. Once all the seats have been cut, the heads are generally resurfaced next.

There's more to it than that, but that should give you some basics.
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Old 04-07-2004, 03:20 PM
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Quote:
Originally posted by GSXMEN
Take a look at the Goodson Catalog. You should get a good idea what tools are available for head work and other stuff.

To answer your question though.....once the heads have been cleaned and checked for cracks, the valve guides need to be inspected - bad/loose guides will need to be replaced. If the exh. seats are in poor shape, now would be the time for hardened seats to be installed.

These days, even stock rebuilds are generally cut with a Serdi style '3-angle' cutter. It's easier for the machine shop and beneficial for the customer too. Once all the seats have been cut, the heads are generally resurfaced next.

There's more to it than that, but that should give
you some basics.
Yeah, I like the 3-angle cutters, too. Once you see how far off these things cut seats (pilot deflection, etc.), you'll see why you have to re-do them with a good seat grinding set-up. But they ARE fast, which I guess is preferable to accurate.

If you are taking traditional machine shop vocational training, as opposed to AUTOMOTIVE machine shop training, you'll find there is a world of difference between the two. Trying to do automotive machining with standard machine tooling is going to be an excersize in frustration.
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