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Old 05-18-2008, 06:15 PM
GMR GMR is offline
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sbc pushrod measurement

I'm trying to measure for proper pushrod length on a sbc 350 that will be using hydraulic lifters. Been reading the posts here and have followed the advice of member k-star where he said "You are looking for the narrowest contact pattern across the top of the stem. This will also give you the most valve lift. You can also use a dial indicator on the spring retainer and adjust the push rod in .050 increments until you achieve the greatest valve lift."

I made up a solid lifter from a hydraulic one (also as k-star recommended) and after several attempts using an adjustable pushrod, I came up with a length that yields the most lift as measured with a dial indicator on the valve retainer. The pushrod length measurement is 7.535.

Since I did not use a head gasket, I am guessing that I have to add the compressed thickness of the head gasket I plan to use (.015) and also the lifter preload. Does .030 sound about right for lifter preload?

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Old 05-19-2008, 12:42 AM
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Suggested hydraulic lifter preload is 0.020" to 0.060". Make certain that the lifters you intend to use have the same dimensions as the lifter you used to check with. Lifters vary. Also, the method of measuring pushrods varies from mfg to mfg. Best way is to package up the lifter and pushrod you used and ship it to the mfg who will supply the pushrods and lifters you intend to use.

Call ahead and make arrangements with a certain individual so that he gets the shipment and knows what's going on.
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Old 05-20-2008, 05:33 AM
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thanks tech
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