We're jinxing ourselves even talking about this stuff. This discussion alone causes leaks. It's not good to talk about it.
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So on a modern build, myself I substitute RTV for the side seals. I try to inject it inside the groove as much as possible and also pack that area using putty knife/fingers and so on.
I did that on my current 451 and it worked perfectly. I just made sure to get the seal holder and the block operating-room clean before applying it.
