One trick to leak-proofing the seal is to put a tiny dab of sealer between the cap and the block on both sides before you torque up the cap. High-temperature RTV rubber works well, either the red or the black type. Don't overdo it. A little goes a long way. If the seal ends can be rotated slightly where the parting line of the seal isn't exactly aligned with the cap/block intersection, that works well, also. Even a 1/4" rotation of the seal ends is plenty to avoid a leak at the parting line. Good luck!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
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