Coosawjack-
I have a CHP 408 also, and get a leak from the rear main also. One in the front where the crankshaft comes through the block. Had the pan off 5 times, new seals, bought a new pan, replaced the rear main, still has a small leak. How did you solve your rear leak? Explain here, or send me an email if it takes too much space on the site.
Thanks,
Jerry Shelby,
Lubrecon@aol.com