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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     Click Here to See the Profile for Gidyup302   Click Here to Email Gidyup302     Edit/Delete Message   Reply w/Quote
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?

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IIblue74
Gearhead

Posts: 163
From: memphis,tn
Registered: Aug 2000

posted 08-16-2001 09:34 PM     Click Here to See the Profile for IIblue74   Click Here to Email IIblue74     Edit/Delete Message   Reply w/Quote
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.

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Gidyup302
Journeyman

Posts: 93
From: CT
Registered: Feb 2001

posted 08-18-2001 09:23 AM     Click Here to See the Profile for Gidyup302   Click Here to Email Gidyup302     Edit/Delete Message   Reply w/Quote
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.

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