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#1 |
Senior Member
Join Date: Mar 2002
Location: Sulphur Springs Texas
Posts: 736
Likes: 118
Liked 155 Times in 44 Posts
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Does anyone know when GM started heat treating the exhaust valve seats on their cylinder heads?
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#2 |
VIP Member
Join Date: Dec 2001
Location: Arkansas - In the middle of everything.
Posts: 1,983
Likes: 54
Liked 726 Times in 177 Posts
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1971 with the introduction of unleaded gas at the pumps.
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