A 54 engine will not work with a neoprene seal. Here's the permanent fix, but it requires machining the back of the block and rear main bearing cap:

https://www.bdiexpress.com/us/en/Ca...8647-3-875X4-751X0-375-CRWA1-R/p/1244244

Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!