Performance Valvetrain Components For Harley-Davidson® Flathead Motors

Not the most sexy products, but because of the number of old Flathead motors (Flatties) being put back on the road and needing to breath a new life, it is good to know that Kibblewhite Precision Machining Inc., since 75 years the worldwide leader in high performance valvetrain components, now offers forged Black Diamond® valves and guides for Harley-Davidson® Flathead motors model years 1930 to 1973.

Once only available by special order, Kibblewhite now stocks the most popular valves and guides for the Harley-Davidson® Flathead motor. “We have seen such a dramatic increase in orders for our Flathead motor performance products that the choice to go into larger scale production was natural.” Say’s Butch Larroche, Sales Manager for Kibblewhite Precision Machining Inc. It is a great feeling to be able to say, yes we have that in stock, when we get a call about a Flathead motor needing help”

These high tolerance, machined valves are the ideal choice for Flathead motors with limited top end oil circulation. The KPMI Flathead guides are manufactured with a proprietary cast iron blend and machined perfectly to match the performance needs of these motor types. Their ultra hard and dramatically smooth finish is engineered for optimal performance in these higher temperature running motors. KPMI’s high tolerance, cast iron guides are designed to match the Black Diamond® valves and motor perfectly for maximum horsepower gains. Superior bore finish and industry leading wear characteristics are gained via extreme density, fine grain and the granular structure of each race proven KPMI valve guide. Contact Kibblewhite Precision Machining Inc. at

7 Responses to “Performance Valvetrain Components For Harley-Davidson® Flathead Motors”

  1. 1 Curt! Jun 20th, 2012 at 9:43 am

    This is good news ! Glad to hear Kibblewhite is stepping up to the plate.

  2. 2 Kirkland Jun 20th, 2012 at 2:25 pm

    What Harleys were about…

    45Brit on Wed Jun 20, 2012 1:11 pm
    Really, no Harley content at all as such, but yesterday I traveled from Sovetskaya Gavan to Khabarovsk – about 500km of some of the wildest country in the Russian Far East, like Oregon or British Columbia. Tarmac roads, gravel roads, dirt roads; some still under construction like scenes from “How The West Was Won”.
    If I was writing a specification for a bike for those roads, I’d say a medium-weight V-twin with an engine in the 40-45″ size range and 18″ or 19″ wheels would be bang on. Makes you realize why the 45″ flathead was such a popular bike for H-D and Indian for so many years, and why the Honda Trans-Alp has been so successful in recent years.

  3. 3 Shanedrive Jun 21st, 2012 at 8:14 am

    QUOTE:”Not the most sexy products,

    Yeah, don’t I know it. As one of the guys that makes ’em run but doesn’t make ’em look pretty, I find these parts to be very “sexy”. Us guys that keep bikes dependable and on the road never get credit—this is one area of this industry that is seriously lacking the “credit due”. 🙂 That’s fine. Those that “know” will always use our services and we’ll quietly go about running our businesses like we always have.

  4. 4 Bruce Jun 21st, 2012 at 8:33 am

    Shanedrive. Sexy is about appearance. You’re too susceptible.

  5. 5 lumpy Jun 21st, 2012 at 11:43 am

    Flat Is Where It’s At!!!!!!! As Vic Always Says….

  6. 6 Shanedrive Jun 21st, 2012 at 2:56 pm

    Yeah I know. But how one looks on the inside is just as important as you look on the outside! Didn’t they teach you that in kindy-garten? (grin)
    Have a good day!

  7. 7 Wiz Jun 27th, 2012 at 7:47 am

    I assume they are designed for no-lead gas. I put Marvel Mystery oil at every gas stop on my 1940 Flathead 74 to compensate, because it’s supposed to run leaded gas. Wiz

Comments are currently closed.
Cyril Huze