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I ordered new spark plugs for my 1933 Master from the Filling Station. They sent me six AC Delco R45 plugs that take a 13/16" socket. I pulled the plugs from my engine tonight and my car has AC C86 plugs that take a 7/8" socket to remove them. Did Chevy have different heads on the 1933 206 cu engine's? Or is the Filling Station listing the wrong plugs for my car?
Thanks,
Dennis
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1934 was the first year to have the smaller 14 MM spark plugs. All1933 models had the larger 18MM thread plugs.
Gene Schneider
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Thanks Gene. I guess I will call the Filling Station tomorrow and ask why they sent the smaller plugs for a 1933 car. I won't try for a refund because I actually bought the plugs almost a year ago and I'm just now getting around to installing them.
Dennis
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Please check the thread size before you call. My experience is that hex size does not necessarily indicate thread size.
Rusty
VCCA #44680
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Rusty 37 Master....By thread size do you mean the outside circumference of the threads? I can do that with a micrometer. But I don't have any way of checking the actual threads themselves.
Dennis
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Do the new plug threads fit into the holes the old ones came out of? That's what Rusty is referring to.
They may use a different size wrench but fit and work fine if the electrode end looks the same and threads in fine...
1938 Canadian Pontiac Business Coupe (aka a 1938 Chevy Coupe with Pontiac shaped front sheet metal - almost all Chevy!)
1975 4-speed L82 Vette
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Tech Advisor ChatMaster - 25,000
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The Mangy Old Mutt
"If It's Not Junk.....It's Not Treasure!"
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In most cases you are right JYD but occassionally a longer plug will protrude far enough to contact the piston which is not advisable.
Tony
1938 1/2 ton Hope to drive it before I retire
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No need to check the thread size. If they ae 45s the thread size is too smalll for a 1933.............
Gene Schneider
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A quick review of spark plug thread sizes:
1929-1932 are 18 mm
1933-1940 are 14 mm
1941-1948 are 10 mm
1949 went back to 14 mm
How Sweet the roar of a Chevy four!
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Yes, I am a year off. You must have an earlier head. What is the casting number?
836961 for 1933 master
836718 for 1932
Gene Schneider
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I didn't get the chance to call the Filling Station today. Where would the head casting number be located? Do I need to remove the valve cover to view it? I am guessing that the suggestion that I have an earlier head would be correct. My old plugs are clearly much larger than the new ones. And I just looked at the Filling Station website and they do show the AC C87 plug for 29 to 32 chevy's. So much for my car being as original as I thought it was.
Dennis
Last edited by Jonda1; 03/15/19 11:26 PM.
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The head casting number is underthe valve cover, drivers side.
Would also post the engine casting number on the lower right side of the block.
Gene Schneider
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Thanks Gene. I'll do that as soon as I get the chance. I'll be out of town for a while.
Dennis
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