Do Chevy 409 engines need special valve seats?

Answer The 409's valve seats can corrode when used with unleaded gas, especially in the presence of high compression or a supercharger. If you're going to boost horsepower or rev the engine past 3,000 RPM... Read More »

Top Q&A For: Do Chevy 409 engines need special valve seats

Does a 409 chevy engine need hardened valve seats?

If you spend a lot of time above 3,000 rpm, make regular trips to the redline and run on unleaded gas, you should use hardened valve seats on your Chevy 409 engine. Otherwise, the valves will stick... Read More »

Flathead Vs. Overhead Valve Engines?

In 1949 Cadillac and Oldsmobile engine designers introduced a modernized version of the overhead-valve engine. Most American cars previous to this time employed an L-head, or side-valve design ofte... Read More »

How to Remove a Broken Spark Plug Tip in Ford Triton 3-Valve Engines?

While spark plugs may seem sturdy enough at first glance, the body of a spark plug is made from ceramic material which can be easily damaged. In some cases, this damage translates into the tip of t... Read More »

When did Chevrolet start using hardened valve seats?

Chevrolet started experimenting with hardened valve seats in 1971 when compression ratios went down as automakers prepared for lead-free gas. They began using them fairly regularly in 1973. In 1974... Read More »