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LQ9 Pushrods length

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Old Nov 11, 2017 | 08:51 AM
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Default LQ9 Pushrods length

Hi guys ,

i almost finish building my engine . I have a 2005 6.0 with a BTR TRUCK STAGE II CAM .I put 243 stock heads and stock oem lifters . BTR recommends a 7.400" pushrod with unmilled heads. I used a comp cams pushrod length checker and came out with 7.325", then i added 0.060" for lifter preload and matched the 7.385" . So I am new at this and was wondering if I am right with the numbers. Also do I need specific pushrods besides 5/16 and both ends are balled? Do I have to have the exact 0.060 lifter preload or can i use 0.050" and go with 7.375 pushrods?
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Old Nov 11, 2017 | 10:43 AM
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Using oem lifters you should do as the vender suggested. Run 7.4 rods. The stock lifters won't mind the preload. If you use shorter pushrods in this set up, you will risk a noisy valve train.
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Old Nov 11, 2017 | 01:42 PM
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Originally Posted by hamood91
Hi guys ,

i almost finish building my engine . I have a 2005 6.0 with a BTR TRUCK STAGE II CAM .I put 243 stock heads and stock oem lifters . BTR recommends a 7.400" pushrod with unmilled heads. I used a comp cams pushrod length checker and came out with 7.325", then i added 0.060" for lifter preload and matched the 7.385" . So I am new at this and was wondering if I am right with the numbers. Also do I need specific pushrods besides 5/16 and both ends are balled? Do I have to have the exact 0.060 lifter preload or can i use 0.050" and go with 7.375 pushrods?
.075" preload will be great on the stock GM lifters.
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Old Nov 11, 2017 | 02:08 PM
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Okay i will go for 7.4 pushrods and see how she is running but if i get valvetrain noise what should i do
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Old Nov 11, 2017 | 03:24 PM
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There are probably 1000's of threads just on that issue . Honestly valve train noise is not something I know much about with LS based engines . Good luck
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Old Nov 15, 2017 | 01:25 AM
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Hi guys

i try the 7.4 pushrods but it making noise when i rev more than 1000 and if rev more it makes more noise.
im thinking now to go with 7.375 pushrods and i will see the valve train noise will go or not .
if there anyone can help me with this issue!!!!!!
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