Editing Valve train geometry (section)
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==Stock pushrod length== ===Chevy small block=== *Stock hydraulic flat tappet SBC- 7.8” *SBC OEM hydraulic roller pushrods are 7.2” long. When using shorter GM OEM roller lifters from the 3.1L or 3.4L V6, or the 2.2L inline 4 cylinder engines, start with 7.500" pushrods. These lifters are mostly only used when converting a flat tappet block to use an OEM roller cam, although they might be an advantage in a roller block due to their lighter weight. *Crane retro hydraulic roller- 7.046" *Retrofit roller lifter pushrods are 7.300". ===Pontiac V8=== Stock pushrod length- 9.130". It has been published that if using Chevy lifters, the pushrod length is 9.290” as a starting point. However, caution must be used if Chevy lifters are going to be tried in a Pontiac engine because the oil band is in a different location. This could effect oiling. There are aftermarket lifters advertised for use in both Chevy and Pontiac engines. These should also be checked but the assumption is that the oil band is correctly located for both applications.
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