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pushrod length

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Old Oct 17, 2025 | 11:46 AM
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Default pushrod length

In putting a 1974 XLCH motor back together after a rebuild I noticed all the pushrods are the same length (I didn't take it apart). I've read that the exhausts are longer and I've also read they are all the same length. Whats correct?
 
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Old Oct 17, 2025 | 12:25 PM
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17904-57 is the part number my manual lists for all of them. fwiw, shovelheads use different lengths
 
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Old Oct 17, 2025 | 01:33 PM
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Originally Posted by Joe12RK
17904-57 is the part number my manual lists for all of them. fwiw, shovelheads use different lengths
Yes...Because Shovelhead all culminate at a Single Camshaft.. the Lengths are Necessarily All Different!! (Evo Too BTW)
Sportsters benefit by having a Cam for Each Valve.. (Todays Fastest Top Fuel Harleys are also 4-Cam design!!)
Ironhead Pushrods should all be the Same...prior to adjustment of course.. minute Differences....
 
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Old Oct 24, 2025 | 02:38 PM
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They’re all the same length on an Ironhead.
 
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