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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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| | | | Joined: Mar 2010 Posts: 1,660 Curmudgeon | | Curmudgeon Joined: Mar 2010 Posts: 1,660 | I hope Carbking steps in if I mess up on the info.
Bill it helps to identify the Carter W1 model you have. Also the altitude (higher--> leaner) where you live and whether are not you plan to run E10 gasoline or non-ethanol. If you are running E10, a lean rod may make your problems worse. Usually run one size richer because E10 has less energy per volume of gasoline. Also your truck may be a 3100 and not a 2100.
Carter W1 684S (from my book 1941-51 Chevrolet)
75-485 standard .067"-.067" to .062"-.062" to .060"-.046"
75-517 1-lean .068"-.068" to .065"-.065" to .064"-.049"
75-562 1- rich (no other info)
Any more questions, I would contact Carbking. He is a busy guy so be polite.
"Adding CFM to a truck will only help at engine speeds you don't want to use."
"I found there was nothing to gain beyond 400 CFM."
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