04-17-2018, 07:11 PM | #1 |
Drives: 2015 Camaro 2SS/RS 1LE Join Date: Feb 2017
Location: Austin MN
Posts: 3
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Pushrod length?
Need pushrod length help for my ls3 camaro. Have btr stage 4 cam, ported my heads, and morel 5290 lifters. I think the morel lifters want .03-.05 preload, any clarification?. When using the 6.8-7.8 pushrod checker took from comp cams, I'm getting 9 and there quarter turns for zero lash. Which is 7.2875. After adding .05 preload i get pushrod length of 7.3375. When I use my 7.4 pushrods, i get about 1.5 turns to bottom out the rocker bolt, which is too much. Do I want 7.35? That would give me just over .06 of preload. Just wondering if that will work smoothly with these lifters.
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04-17-2018, 07:26 PM | #2 |
Drives: 2015 1LE Join Date: Oct 2015
Location: Cleveland, OH
Posts: 1,485
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if the range is .03 to .05 then use a 7.325 pushrod for 0.0375 preload or custom order a pushrod set at the desired lenght. Do the lifers come with the preload spec? you sounded uncertain about it.
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04-17-2018, 07:32 PM | #3 |
Drives: 2015 Camaro 2SS/RS 1LE Join Date: Feb 2017
Location: Austin MN
Posts: 3
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Double checked the paper, .045-.05 from morel. I pulled .03-.05 from web
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04-17-2018, 09:37 PM | #4 |
Drives: 2015 1LE Join Date: Oct 2015
Location: Cleveland, OH
Posts: 1,485
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04-17-2018, 09:57 PM | #5 |
Drives: 2010 Camaro 2SS/RS ABM 6M Join Date: Jul 2017
Location: Kansas
Posts: 617
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x2 for the checking a few. That's a really tight preload range to try and hit
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2010 ABM 2SS/RS LS3 6 Speed -- Rotofab CAI | Speed Engineering 1 7/8" Longtubes w/ cat Delete | Magnaflow competition catback | TSP 231/246 cam| TSP/PAC .660" Spring Kit | TSP CNC Ported Heads | Bo White PTB | GPI Ported/RM Intake | 3.91's | BC Catch Can | MGW Shifter | BMR 1" Drop Springs | BMR Trailing arms/Toe Rods/Rear UCA Bushings | Pegasus Subframe Mounts
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04-22-2018, 10:46 AM | #6 |
Drives: '15 SS 1LE, '69 Z28 drag car Join Date: Dec 2009
Location: Mich
Posts: 4,483
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Like mentioned, measure a few cyls both int and ex. Then come up with a length that puts the preload between .04 and .05. Then call a PR company like Trend and see if they can do a custom length. If they'll make any length, I'd shoot for that .05. If your PTV is real close, shoot for the lower end of the range .04. Plenty of PTV, go .05.
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04-23-2018, 05:48 AM | #7 |
Drives: Red Jewel Camaro SS Join Date: Mar 2014
Location: East Coast
Posts: 392
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Yes, different lifters,heads,block combo.Definetly double check to get the right preload. Mine is 7.575 push rods with 0.035 preload just to compare with Johnson short travel lifters.
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BTR LSX388,AGP Twin Turbo.6L90,GM 9.9" Diff.Fore Innovations Level 4 fuel system.Great fuel economy !!!! 1xxx RWHP
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Tags |
btr, comp cams, morel, preload, pushrod |
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