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#73658 02/21/2007 8:58 AM | Joined: Mar 2005 Posts: 1,029 Member | | Member Joined: Mar 2005 Posts: 1,029 | Looks like an octane selector. Octane selectors were stock on Chevies from 1933 until near the last of the 216s. The engine is timed to factory specs with the octane selector at zero and initial timing can be advanced or retarded ten degrees depending on the octane of gasoline available. | | |
#73659 02/22/2007 8:58 AM | Joined: Oct 2001 Posts: 3,458 Extreme Gabster | | Extreme Gabster Joined: Oct 2001 Posts: 3,458 | The octane selector on the 216 I used to have was on the block just like the 235. That advance looks like you can dial in both the initial and total advance with the thumbwheels. Interesting piece.
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#73660 02/23/2007 1:14 PM | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | The later stovebolt 216/235/261 Octane Selectors were used through the end of the series (1962/63). As 4ontheFloor stated, they did not have the thumb-screw.
There was a pre-216 stovebolt engine in a truck at the 2006 ATHS gathering in Baltimore, MD. It had an octane selector with a thumbscrew. | | |
#73661 02/23/2007 6:26 PM | Joined: Mar 2005 Posts: 1,029 Member | | Member Joined: Mar 2005 Posts: 1,029 | It's identical to my 1933. Master Parts Price List book shows that type, with the double knurled nuts, was used on all Chevrolet models in 1933 and 1934. This would include the 206 cubic inch engines and the Standard 181 cubic inch engines. The double nuts are not for adjusting initial and maximum advance, but for adjusting the octane setting and locking it in place. | | |
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