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'74 to '78 -- The Mustang II

pressed in valve seats

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Author	Topic: pressed in valve seats
Gidyup302 Journeyman Posts: 93 From: CT Registered: Feb 2001	posted 08-16-2001 07:28 PM I had a problem with my 69 302,started up one night and a valve stuck open. I just pulled it apart and there is pressed in valve seats,one of them came out and logdeditself in sideways. Now I have a pair of 78 heads with bigger valves in them but there are no pressed in seats. Anyone know why those seats are pressed in? Is it due to a rebuild with the same size valves and the seats just being un repairable? IP: Logged
IIblue74 Gearhead Posts: 163 From: memphis,tn Registered: Aug 2000	posted 08-16-2001 09:34 PM Most likely those were hardened (stellite) seats that were added to allow the use of unleaded gas. The 78's were built after the factory started building for unleaded. I don't know if they changed the alloy or what but they don't need hardened seats. IP: Logged
Gidyup302 Journeyman Posts: 93 From: CT Registered: Feb 2001	posted 08-18-2001 09:23 AM thanx IIblue74, Yes this is true,the seats are replced with hardened ones,and they did change the steel on the later models. Im sure glad that ring didn't hit a piston. Real happy,only $50-$100 to fix. IP: Logged

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