hagerty_justin Posted January 17, 2009 Share Posted January 17, 2009 I have a 300-6 ford engine that just blew a head gasket, I took the head off and the first three intake valves were mushroomed ant the last three were perfectly flat. This has stopped my progress on my Z!!! I dont know if i should just put the head back on or take it to a shop and ask them. Is it possible that the machine shop that rebuilt the engine 2000 miles ago put in the valves like that for a reason? I need help so i can continue my Z project. Thanks! Quote Link to comment Share on other sites More sharing options...
dr_hunt Posted January 18, 2009 Share Posted January 18, 2009 I have seen that before. Poor quality valves. Ferrea had that problem when they first came out. I built a 434" sbc alky sprint car motor with brodix heads and those ferrea valves and at the first race during hot laps the engine started missing, valve adjustments were tight, re-set them and car went out again only to come back with the same problem. Tore the engine down and the valves were "tuliped" The center where the stem meets the head had pulled and the valve length was was alot longer. Odd problem, but was common back in the early days especially with stock valves and lots of spring pressures. Switched to Manley sever duty valves and no more problem. Switch valves and your problem will likely go away. Quote Link to comment Share on other sites More sharing options...
hagerty_justin Posted January 19, 2009 Author Share Posted January 19, 2009 well thanks for the info but the engine ran fine before i blew my head gasket. but maybe ill change them anyways. im having a shop look at it today or tomorrow. Quote Link to comment Share on other sites More sharing options...
JMortensen Posted January 19, 2009 Share Posted January 19, 2009 My valves were tuliped when this was filmed: http://videos.streetfire.net/video/2000-autox-indisde-and-outside-I-think-my_8051.htm The jackass machinist I used the first time I built my engine cut the valves way too much and the geometry was F'ed up, he really screwed that valve job up bad. Anyway, just because the valves are tuliped a little bit doesn't mean the engine won't run decently well. Quote Link to comment Share on other sites More sharing options...
hagerty_justin Posted January 21, 2009 Author Share Posted January 21, 2009 Okay thanks for the help, the machine shop said the builder of the engine just put in two defferent types of valve and not to worry about it. Quote Link to comment Share on other sites More sharing options...
JMortensen Posted January 21, 2009 Share Posted January 21, 2009 In the future, the way to tell if there is a problem is to lay the valve on its side and roll it. If it wobbles, its tuliped. Putting two different valves in there will change the compression on one cylinder vs another. Not a big deal on a truck motor, but still crappy workmanship. Quote Link to comment Share on other sites More sharing options...
hagerty_justin Posted February 16, 2010 Author Share Posted February 16, 2010 thanks guys Quote Link to comment Share on other sites More sharing options...
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