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Old 07-07-2005, 03:55 PM
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measuring push rod length???

i am in the middle of converting my sbc from a hyd flat tappet cam to a hyd roller cam with roller rockers. i understand that i need a) hardened pushrods and b)shorter pushrods. my question is this... how do i measure or determine the length for my new pushrods? any tips or advice would be greatly appreciated.
thanks keith

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Old 07-07-2005, 11:53 PM
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tool

There is this tool.
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Old 07-08-2005, 07:18 AM
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You will also need the geometry tool to replace the rocker along with the adjustable pushrod. There is a tool that you slide over the stud until it contacts the valve stem. If you have a standard length pushrod you can install it as well and see if it contacts the tool properly. If it is perfect it will just contact the tool when it contacts the valve tip. If it is too long the tool with hit the push rod and not the valve stem. If it is too short the tool will not touch the push rod. If you have the adjustable pushrod tool, you can just screw it out till the it contacts the geometry tool. Then just measure the tool and buy the pushrod closest to what you measure. Chances are there will be one within .005 of what you need.

Chris
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Old 07-08-2005, 08:14 AM
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In most cases, if you just buy the standard push rods for a sbc recieving a retro-fit roller lifter, it will be fine.
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Old 07-08-2005, 08:26 AM
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geometry tool

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You will also need the geometry tool to replace the rocker along with the adjustable pushrod. There is a tool that you slide over the stud until it contacts the valve stem.
I was trying to find one of those and couldn't find one anywhere on the net. I know they sell them down the street.
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Old 07-08-2005, 08:40 AM
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Here is one. They sell adjustable pushrods too.
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Old 07-08-2005, 09:31 AM
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what is the standard retro fit length? is this length common knowledge for performance parts dealers?
thanks for all the responses.
keith
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Originally Posted by 454C10
In most cases, if you just buy the standard push rods for a sbc recieving a retro-fit roller lifter, it will be fine.
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Old 07-08-2005, 10:01 AM
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7.195 long is standard for a Hyd roller. If the geometry was ok in the old setup with standard length pushrods then the geometry in the new setup should be ok with the standard length for a roller setup. What I would do if I were you and don't want to buy (or make) a length checker would be to go to your local AutoZone or ? and buy a cheapy replacement pushrod for a roller motor (probably under $10) mock it up, and see how the geometry looks. If it looks good then buy the good pushrods.
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