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Pushrod Length Suggestion

   
Old 01-16-2013, 06:27 PM
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Default Pushrod Length Suggestion
Hey guys Im running a 5.3 Lm7 , stock heads have been milled .030 to 58cc with ls7 lifters anyone run anything similar that can suggest a pushrod length?
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Old 01-16-2013, 07:25 PM
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LM7 here too with 799 heads milled 0.022" and LS7 lifters, I'm using 7.325" pushrods for ~0.075" preload. With the stock heads and LS7 lifters I used 7.350" pushrods. Always best to measure!
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Old 01-16-2013, 07:27 PM
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I suggest you buy a $20 checker and be sure and get it right. Sometimes you may need several different lengths.
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Old 01-18-2013, 10:39 PM
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Originally Posted by mvrotc
Hey guys Im running a 5.3 Lm7 , stock heads have been milled .030 to 58cc with ls7 lifters anyone run anything similar that can suggest a pushrod length?
Try .025 shorter after checking your 7.400s first.
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Old 01-18-2013, 11:35 PM
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Originally Posted by JPH
Try .025 shorter after checking your 7.400s first.
Don't "try" anything. Measure so you know for sure.
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Old 02-10-2013, 12:40 PM
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i tried measuring today and came up with a base length of 7.325???? so if i use a .075 preload that puts me at a 7.4 pushrod length?? i thought for sure theyd be shorter
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Old 02-11-2013, 05:17 PM
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buy the checker valvetrain geometery is critical for engine performance
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Old 02-11-2013, 06:29 PM
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Originally Posted by Tainted
I suggest you buy a $20 checker and be sure and get it right. Sometimes you may need several different lengths.
X20million
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Old 02-11-2013, 06:58 PM
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Originally Posted by mvrotc
i tried measuring today and came up with a base length of 7.325???? so if i use a .075 preload that puts me at a 7.4 pushrod length?? i thought for sure theyd be shorter
That's too much preload.. .050 is a good middle of the road.. At most 60
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