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Old 10-04-2021, 12:02 PM
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Tom Vaught Tom Vaught is offline
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1) I still see lots of Holley used carbs at swap meets in the $15 to $35 range.
Most are slightly used but still very good ZINC parts on them.

Holley went from Zinc material Carbs to Aluminum Material Carbs.
Zinc plating will last for many years without issues. A friend of mine who worked
at Holley, with me, still does some "re-plating" using proper chemicals but not
OSHA approved.

But the key deal is that aluminum carbs do not last. Great for a Big Name carb seller.
More sales, cheaper costs, more profits.

Personally I would pay any day to acquire a couple of used Swap Meet Zinc Carbs,
and run them as is or have them plated. Then you have a lifetime carb.

The good Gaskets are still out there, I have hundreds of the good BLUE bowl gaskets
for the 4150 carbs. 4165 and 4175 carb parts (gaskets) much less.

Not a sales pitch. Rarely sell carb rebuild kit parts.

Just saying. The old stuff was calibrated by Carb Engineers who had tons of Carb knowledge.
Mike Urich, Chief Engineer, and book writer being one of them. Mike was a good guy.

So my post here is a carb information post, not specific to this discussion on Spread Bore Holley Carbs.

Tom V.

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Last edited by Tom Vaught; 10-04-2021 at 12:13 PM.
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