Thanks Rod, while searching I found the thread where you asked the question. Come on Dan, help us out.

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62 Valiant, 225cid Slant 6/PB 904 with lots of good bits

http://www.moparmarket.com/readersrides ... user=SV162

You can run the washers or not. I have seen no performance/mileage difference whatsoever, except that your drool tubes might last longer w/o the washers due to wear on the aluminum.

Dan certainly distributes a huge volume of useful advice, which we are all grateful for. Certainly the plug part numbers and heat range info is useful. However, I do not believe Dan has developed or built performance Slant 6s or has likely been down a dragstrip. This is my impression and I don't know for sure. Personally, I take his performance advice with some caution. He can feel free to correct me if I'm wrong.

Best,

Lou

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Home of Slant6-powered fun machines since 1988

No performance/mileage difference has ever been claimed. Please go read the thread with factory info on why '60-'62 heads run the washers and '63+ heads don't.
True.
False.

And clarifying muddled information on spark plug heat ranges is not really "performance advice".

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Donno. I can look in my VE-VF FSM next time I'm at the office. The casting number didn't change up here until '68, either; the spark plug seat change was made as a running change.
Everyone up here does so, too, because the factory advice to remove the washers is no longer common knowledge.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Dan
I merely stated that on a Preformance slant engine (which His is) the use of extended tip spark plugs is " at least under question and/or a bad idea due to Heat Build-up" not heat range of the plug.
Frank

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Scrapple: Because a mind is a terrible thing to waste.
73 Duster - Race Car
66 Dart Wagon - DD
178" FED
82 D150
All Slant powered