Valve Train Assembly Issue - Pontiac G8 Forum: G8 Forums - G8Board.com
 
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post #1 of 7 (permalink) Old 07-18-2019, 08:41 PM Thread Starter
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Valve Train Assembly Issue

I am building a Ls2 for my G8 right now. Stock crank .010 under cut, eagle h beams, dss pistons, btr cam, 1.8 roockers... My problem is when I put my rockers on and tq then down I did a tentative rotation. When I did I felt incramental binds, like valve hitting a piston. However upon inspection, they are not hitting. I cannot figure out what is binding. Is it maybe the lifter plungers bottoming? Any ideas?
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1988 K2500 ~ 6.0 LS swap, 700r4 w/ TCI 2500 stall, 4.10 rear

2009 G8 GT ~ 364ci/6.0L, small cam, dyno tune
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post #2 of 7 (permalink) Old 07-19-2019, 11:48 AM
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Valve springs going into bind?

09 G8GT, LR,
70 Nova SS L78

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post #3 of 7 (permalink) Old 07-22-2019, 11:40 AM
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A BTR cam and 1.8 rockers??? The springs may handle it but what about the retainer to valve stem seal clearance. Do you have any "checking springs" saves all this hassle if you pre assemble a couple cylinders with them. So easy to check your PTV and retainer to seal clearance. Any Speed Shop sells them 2 for $5 of a set of 8 for a head is $15. Even a test with stock rockers? Is the pushrod length right? How many turns from zero clearance?

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post #4 of 7 (permalink) Old 07-23-2019, 02:44 AM Thread Starter
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So some more checking has revealed the following results: i am not spring binding, the kit cam with lower seals, and i have very light .040ish preload in the lifters with these pushrods (another issue entirely). I will have to find check springs and try that. Nothing is really popping out and saying, im the bind... soooo. I did notice the bind feeling starts when the rocker just starts to go down... am i mistaking spring pressure for binding?

1988 K2500 ~ 6.0 LS swap, 700r4 w/ TCI 2500 stall, 4.10 rear

2009 G8 GT ~ 364ci/6.0L, small cam, dyno tune
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post #5 of 7 (permalink) Old 07-23-2019, 02:28 PM
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It could be spring pressure you feel. Did you lube the end of the pushrod and valve stem with moly assemble lube?

'09 PBM GT. #2 Kook's Mids, Solo Mach balanced, SCT X4 Tuner. LED H/lamps, Tail lamps and Interior
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post #6 of 7 (permalink) Old 07-23-2019, 09:59 PM Thread Starter
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Yes everything was assembled with moly. Still waiting on check springs.

1988 K2500 ~ 6.0 LS swap, 700r4 w/ TCI 2500 stall, 4.10 rear

2009 G8 GT ~ 364ci/6.0L, small cam, dyno tune
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post #7 of 7 (permalink) Old 07-27-2019, 08:36 PM Thread Starter
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Just wanted to put an end to this. I installed the engine and ran it up. Everything is fine. Got longer pushrods and all that. Zero issues. I was being paranoid and thought the spring pressure was binding. Thanks for the replies!

1988 K2500 ~ 6.0 LS swap, 700r4 w/ TCI 2500 stall, 4.10 rear

2009 G8 GT ~ 364ci/6.0L, small cam, dyno tune
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