Re: 239 flathead, block the heat riser passage, or no?
I will freely admit, mine is a little slower to warm up on the cooler mornings. But once the sun gets higher, and driving at 8300 ft with the "modern" gas, it runs fine. But that is also why I made the tabs easier to remove, in the event anything changes.
This works for me, it may not work for everyone.
Last edited by Merc Cruzer; 04-02-2023 at 08:17 PM.
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