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421 cub leakdown test.....uhh ohh!


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Just got my new gasket in from NLP (which fit better than the other gasket I had come with my cub) and applied 1211 gasket maker on the case side. Istalled gasket then cylinder and torque down. Performed leakdown and its still leaking in the same spots but not as bad. Holds 6psi for 1.5 min. I know that is unacceptable, so off to buy a set of cases that hopefully are port matched for a cub. Good luck to me fellas!!!!!!!

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Just got my new gasket in from NLP (which fit better than the other gasket I had come with my cub) and applied 1211 gasket maker on the case side. Istalled gasket then cylinder and torque down. Performed leakdown and its still leaking in the same spots but not as bad. Holds 6psi for 1.5 min. I know that is unacceptable, so off to buy a set of cases that hopefully are port matched for a cub. Good luck to me fellas!!!!!!!

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And thanks for the help yall, but I guess the damage to the cases were too bad and they had chain whack anyway. If yall know anyone with a set please send them my way. Thanks again for all the help

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Pm nastyracing. I believe he still has a set of un whacked cases

Thanks man, I'll hit him up.

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Nice ddu . I use that copper spray on all motors gaskets....two stroke to four stroke to 700 hp smallblocks... I swear by this halomar stuff..coat gasket once let it sit coat it again let it sit....install it after it sat for about 15 minutes...shit works.....

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Are you interested in selling them cases as is? it's an real easy fix if you take the time to do so. :shrugani:

 

I'm still trying to figure out what to do, fix or replace. To fix it wouldn't you have to deck it on a lathe?

I'm also unsure on buying a set of cases that are already port matched for a cub. Some say it has to be matched to your set up and others say there's not much difference between one port match or the other (as far as cases are concerned). I've kinda threw my hands up for a little while and started back working on my house to keep my mind off of her for a bit. I wanted to contact my builder but he's out of town for a while so all opinions welcome. Thanks

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