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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
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on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 |
As Don posted, neither hardened valve seats nor leaded gasoline are needed in a 216/235/261 engine, unless you are regularly running the engine at very high RPM for long periods.
Either would be waste of money.
High-compression, high-octane, muscle car era engines are another matter.
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