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| Offy 4bbl intake on eBay with odd "fuel dam" on #3-4 cylinders https://slantsix.org/forum/viewtopic.php?t=68539 |
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| Author: | Jase [ Sat Feb 14, 2026 11:21 am ] |
| Post subject: | Offy 4bbl intake on eBay with odd "fuel dam" on #3-4 cylinders |
Is this necessary on the Offenhauser as a result of #'s 2& 5 running a bit lean. I thought it was cylinders 1 and 6 that were often rich... See picture #5, https://www.ebay.com/itm/317847802916?_ ... R4TzstSLZw |
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| Author: | Dart270 [ Sat Feb 14, 2026 12:15 pm ] |
| Post subject: | Re: Offy 4bbl intake on eBay with odd "fuel dam" on #3-4 cylinders |
Absolutely not needed. Probably won't really hurt anything either. Yes, 1 and 6 might run slightly richer, but it is very slight. Unless your carb is really messed up or trying to run right on the edge of lean or detonation, the cylinder-cylinder distribution is very good on all common Slant 6 manifolds. That said, with a 2bbl mounted with barrels side-side like that, I usually run about 2-3 (holley) jet sizes bigger on the inner barrel and can see a small difference in the plugs if I bother to check. Lou |
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| Author: | Reed [ Sat Feb 14, 2026 1:05 pm ] |
| Post subject: | Re: Offy 4bbl intake on eBay with odd "fuel dam" on #3-4 cylinders |
The old Mopar Performance racing manual used to recommend a fuel dam like that behid the secondary throttle bores on a normally oriented four barrel intake to combat the tendency of the middle cylinders to run richer than the outer. |
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