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Doing more research for my build, and didn’t find anything in a search of anyone doing this. I know Tony Mamo likes to do this mod on the Yella Terra’s. Anyone done this to any other style rockers?
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.
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.
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.
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.
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 isn’t as strong. i have used this LS3 head to try it would. More details to come
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.
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. It’s made out of 1018 CR for sample right now. Tsp rockers were used
01-01-2019, 09:21 PM
Worth it to upgrade my rockers to 10mm bolts? 
