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#1
11-11-2016, 09:35 PM
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I also agree they are 2 piece. One way you can tell is to run a magnet down the stem. If it sticks to the stem, then suddenly doesn't stick anymore near the head, it is a 2 piece valve. Also 2 piece valves usually have a bulge in the stem where the head is friction welded to the stem. They make them 2 piece because that way they can use a very high heat alloy for the head, and combine it to a stem that can be a lot more wear resistant.
2 piece valves have no place in a performance engine. Had one destroy my 428.
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Paul Carter Carter Cryogenics www.cartercryo.com 520-409-7236 Koerner Racing Engines You killed it, We build it! 520-294-5758 64 GTO, under re-construction, 412 CID, also under construction. 87 S-10 Pickup, 321,000 miles 99Monte Carlo, 293,000 miles 86 Bronco, 218,000 miles |
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