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Worth it to upgrade my rockers to 10mm bolts?

 
Old 01-01-2019, 09:21 PM
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Default Worth it to upgrade my rockers to 10mm bolts?

Doing more research for my build, and didnít find anything in a search of anyone doing this. I know Tony Mamo likes to do this mod on the Yella Terraís. Anyone done this to any other style rockers?
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Old 01-01-2019, 09:26 PM
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What’s the setup? Spring rate? Rpm? What rocker you running currently?
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Old 01-01-2019, 09:38 PM
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Prc 237 heads, turned down ls3 intake valves (87g), solid exhaust valves (96g), tsp pac .660 springs shimmed .060 from bind (should be approx. 175lb seat 430lb open) ti retainers, tsp roller rockers, 3/8 pushrods, Johnson 2126lsr lifters


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Old 01-02-2019, 10:09 AM
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Was reading some some old posts where Martin Smallwood belived the trend to make more power with less exhaust lift was more due to valvetrain flexing than the lower lift being better.

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Old 02-05-2019, 12:05 PM
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Bumping this up with some updated engine info above.
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Old 02-05-2019, 01:51 PM
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The larger bolt is probably better, but depending on the usage, I don't know if it would be worth it. I would think there's more deflection in the aluminum rocker body than the steel bolt.
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Old 02-05-2019, 03:29 PM
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Originally Posted by KCS View Post
The larger bolt is probably better, but depending on the usage, I don't know if it would be worth it. I would think there's more deflection in the aluminum rocker body than the steel bolt.
my rockers are steel, but point taken
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Old 02-05-2019, 03:39 PM
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Originally Posted by bthomas View Post

my rockers are steel, but point taken
What rockers? Are you thinking of converting your current rockers to use a M10 bolt?
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Old 02-05-2019, 03:51 PM
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Originally Posted by KCS View Post

What rockers? Are you thinking of converting your current rockers to use a M10 bolt?
yes, and these https://www.texas-speed.com/p-7364-t...oller-tip.aspx
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Old 02-05-2019, 04:20 PM
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Do you see deflection now in terms of valve control problems above 6500? Why do you think you need the M10 bolt?

I think you need like a PAC1207X type spring to control them. The regular platinum/400lbs open stuff won't be enough.
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Old 02-05-2019, 04:31 PM
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Originally Posted by JakeFusion View Post
Do you see deflection now in terms of valve control problems above 6500? Why do you think you need the M10 bolt?

I think you need like a PAC1207X type spring to control them. The regular platinum/400lbs open stuff won't be enough.

heads are off car currently, would be an easy upgrade. Just trying to fix any short comings I can.

A little discomforting to see you think I need more spring. I was thinking with the lighter ls3 valve that wouldnít be needed.
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Old 02-05-2019, 08:25 PM
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You need more spring. LS3 valve helps a lot, but the MOI is still going to be what you need more control, especially as it comes closed.

In fact, I don't care that they weigh only 8 grams more over the valve. The Yella Terras are lighter than that over the valve. And they need like 170 closed and 425+ open (all they are rated to handle). It's all because the MOI is considerably higher.

Maybe you can shim up your springs and get the close pressure up to 160+ and still hopefully 400-440 open. Should be fine as long as you don't have crazy lobes.
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Old 02-11-2019, 11:11 AM
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Ended up at 175 seat with the springs shimmed up
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Old 02-11-2019, 03:37 PM
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Should work awesome.
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Old 02-11-2019, 08:29 PM
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Originally Posted by JakeFusion View Post
Should work awesome.
Agreed.
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Old 02-13-2019, 02:09 PM
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I have been talking with HPR In McKinney about doing a larger bolt but, from what i have been told it will help but the base isnít as strong. i have used this LS3 head to try it would. More details to come
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Old 02-13-2019, 02:38 PM
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A shaft style rocker will reduce moi and help everything stay in control . By the time you mod the head for the larger bolt and buy the roller rocker you can have a set of shafts. The body is much thinner on the shaft style vs the regular roller rocker.

i just got a set of psi 1516 beehive valve springs to run on darth's old llsr cam. I like reducing mass as much as possible for added control. Hopefully it runs to 8k rpm with out issue.
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Old 02-13-2019, 03:21 PM
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Originally Posted by HioSSilver View Post
A shaft style rocker will reduce moi and help everything stay in control . By the time you mod the head for the larger bolt and buy the roller rocker you can have a set of shafts. The body is much thinner on the shaft style vs the regular roller rocker.

i just got a set of psi 1516 beehive valve springs to run on darth's old llsr cam. I like reducing mass as much as possible for added control. Hopefully it runs to 8k rpm with out issue.
ive been putting it off but i have been working on these lately. Itís made out of 1018 CR for sample right now. Tsp rockers were used
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