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Old 10-10-2013, 10:57 AM   #43
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Originally Posted by JANNETTYRACING View Post
Possible 7.400 is more typical

That is a 1/4 inch difference.
I believe it had 7.4 in it before and the valve were not opening all the way because they were .200+ too short. With the big cam it sounded like a stock cam so the shop redid the pushrods and put in longer ones.
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Old 10-10-2013, 11:18 AM   #44
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Quote:
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I believe it had 7.4 in it before and the valve were not opening all the way because they were .200+ too short. With the big cam it sounded like a stock cam so the shop redid the pushrods and put in longer ones.
If the pushrods were too short there should have been valve lash and a lot of valvetrain noise

If there was no lash and no noise it should not affect how far the valves open.

Ted.
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Old 10-10-2013, 02:47 PM   #45
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With my PRC 260 heads, I used a set of 7.5 for the first cam and a set of 7.55 for the second cam.
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Old 10-10-2013, 03:36 PM   #46
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So nobody bothers to count turns of the bolt to verify preload is in the correct range? It doesn't even take any more time. The second time too? Jeez.
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Old 10-10-2013, 09:31 PM   #47
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So nobody bothers to count turns of the bolt to verify preload is in the correct range? It doesn't even take any more time. The second time too? Jeez.

LOL... Throw the dice you may get it right once

We verify everything in house here with a snap-on dial indicator gauge. At least the turn/feel method would be fine. We just did a set of PRC's that took 7.600"s.

Ted: The deck height and valve angles are changed so it takes the longer pushrod.

Who remembers the 11* ETP head days of the SBF pushrods 8.100" range
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Old 10-10-2013, 09:46 PM   #48
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Yep PRC, take longer pushrods
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Old 10-11-2013, 04:21 AM   #49
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Originally Posted by killmode_on View Post
So nobody bothers to count turns of the bolt to verify preload is in the correct range? It doesn't even take any more time. The second time too? Jeez.
I guess its the same the way some people think plugging in some electronics is the solution to all problems.

If the basics aren't right, it'll never be right. It takes competence and experience before everything to make it all work.
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Old 10-11-2013, 07:57 AM   #50
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LOL... Throw the dice you may get it right once

We verify everything in house here with a snap-on dial indicator gauge. At least the turn/feel method would be fine. We just did a set of PRC's that took 7.600"s.

Ted: The deck height and valve angles are changed so it takes the longer pushrod.

Who remembers the 11* ETP head days of the SBF pushrods 8.100" range
I am all to familiar with proper measuring of pushrods, Every aftermarket head, cam, rocker, valve combination can take a different length.

7.650 just sounded long.

I think we only have about .080 to play with in the lifter if my memory serves me, Tony does all the assembly these days.

Ted.
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Old 10-11-2013, 10:29 PM   #51
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Originally Posted by JANNETTYRACING View Post
I am all to familiar with proper measuring of pushrods, Every aftermarket head, cam, rocker, valve combination can take a different length.

7.650 just sounded long.

I think we only have about .080 to play with in the lifter if my memory serves me, Tony does all the assembly these days.

Ted.

I was just joking with Unreal about throwing the dice btw.

.030-.080" , I like a bit towards the tighter side in the .040-.060 range if plausible with pushrod availability if not going custom.

In better news.. I have seen some dyno numbers from today we'll let Camper show them, unfortunately broke something in the rear before the final pass.
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Old 10-11-2013, 11:07 PM   #52
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I may let camper sit and make zoom zoom noises in my rental and then he will sell the camaro and it will all be for nothing.

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