Standard valve guides for KN-series engines; fit stock 1936–1947 OHV Knucklehead Big Twins. Reduced upper diameter for high-lift valve springs.
Designed for KN-series engines and compatible with stock 1936–1947 OHV Knucklehead Big Twins. These valve guides are standard fitment and provide reliable valve alignment. ⚙️
The upper diameter is reduced compared to stock to accommodate high-lift valve springs, improving clearance and performance. Easy to install and finished for durability.
This product fits the following vehicles. Use the filters below to narrow down the list if needed.
| Manufacturer | Model | Family | Year | Notes |
|---|---|---|---|---|
| Harley Davidson | Big Twin | 1936 | ||
| Harley Davidson | Big Twin | 1937 | ||
| Harley Davidson | Big Twin | 1938 | ||
| Harley Davidson | Big Twin | 1946 | ||
| Harley Davidson | Big Twin | 1947 | ||
| Harley Davidson | Big Twin | 1936 | ||
| Harley Davidson | Big Twin | 1937 | ||
| Harley Davidson | Big Twin | 1938 | ||
| Harley Davidson | Big Twin | 1939 | ||
| Harley Davidson | Big Twin | 1940 | ||
| Harley Davidson | Big Twin | 1941 | ||
| Harley Davidson | Big Twin | 1942 | ||
| Harley Davidson | Big Twin | 1943 | ||
| Harley Davidson | Big Twin | 1944 | ||
| Harley Davidson | Big Twin | 1945 | ||
| Harley Davidson | Big Twin | 1946 | ||
| Harley Davidson | Big Twin | 1947 | ||
| Harley Davidson | Big Twin | 1946 | ||
| Harley Davidson | Big Twin | 1947 | ||
| Harley Davidson | Big Twin | 1941 | ||
| Harley Davidson | Big Twin | 1942 | ||
| Harley Davidson | Big Twin | 1943 | ||
| Harley Davidson | Big Twin | 1944 | ||
| Harley Davidson | Big Twin | 1945 | ||
| Harley Davidson | Big Twin | 1946 | ||
| Harley Davidson | Big Twin | 1947 |
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