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small-block stroker oil pan leaks #649731 03/23/10 11:09 PM 03/23/10 11:09 PM
Joined: Jul 2005 Posts: 69 BC Canada C cudasam OP member
cudasam OP member C Joined: Jul 2005 Posts: 69 BC Canada	I have a 406 magnum stroker in an e-body, and I can't seem to stop the oil pan from leaking at the rear. I have tried a stock 360 pan with a one-piece magnum gasket, and then I tried a stock size aftermarket pan with a Mopar 360 LA gasket set. This worked great for a few days ,until my motor started to break in .it seems like when I started hitting higher rpm's, the leak started again. I have no windage tray, so is it possible the crank is spinning in oil under acceleration and getting forced out under pressure? Should I just bite the bullet and go with a Milodon low profile? Thanks.

Re: small-block stroker oil pan leaks [Re: cudasam] #649732 03/23/10 11:26 PM 03/23/10 11:26 PM
Joined: Feb 2004 Posts: 4,501 Gainesville,FL G goldmember master
goldmember master G Joined: Feb 2004 Posts: 4,501 Gainesville,FL	Quote: I have a 406 magnum stroker in an e-body, and I can't seem to stop the oil pan from leaking at the rear. I have tried a stock 360 pan with a one-piece magnum gasket, and then I tried a stock size aftermarket pan with a Mopar 360 LA gasket set. This worked great for a few days ,until my motor started to break in .it seems like when I started hitting higher rpm's, the leak started again. I have no windage tray, so is it possible the crank is spinning in oil under acceleration and getting forced out under pressure? Should I just bite the bullet and go with a Milodon low profile? Thanks. Changing pans isn't going to fix the problem. Any pan with straight rails and proper installation should work. Are you sure the oil isn't coming from another location? Rear main seal or even oil sending unit? Are you overfilling the pan? If so I'd stop it today.

Re: small-block stroker oil pan leaks [Re: cudasam] #649733 03/23/10 11:45 PM 03/23/10 11:45 PM
Joined: Nov 2004 Posts: 7,647 Houston Texas PAINT IT BLACK Got a CHIP on my shoulder
PAINT IT BLACK Got a CHIP on my shoulder Joined: Nov 2004 Posts: 7,647 Houston Texas	I had the same problem on my 408 on a small scale. I am trying a Milodon low pro pan now, but don't have it back in the car yet.... so I'm not any help...

Re: small-block stroker oil pan leaks [Re: PAINT IT BLACK] #649734 03/24/10 01:12 AM 03/24/10 01:12 AM
Joined: Jan 2003 Posts: 27,468 So Cal autoxcuda Too Many Posts
autoxcuda Too Many Posts Joined: Jan 2003 Posts: 27,468 So Cal	The one piece magnum type gasket doesn't fit the older blocks 100% correctly. Something about the corner to pan connection needing spacers. I put one in my 360 and the rear cap to pan didn't seem right at all.

Re: small-block stroker oil pan leaks [Re: autoxcuda] #649735 03/24/10 10:48 AM 03/24/10 10:48 AM
Joined: Aug 2004 Posts: 3,333 MARYLAND 69Cuda340S master
69Cuda340S master Joined: Aug 2004 Posts: 3,333 MARYLAND	If you didn't put a thin film of RTV sealer between the block and rear main cap it could be leaking there.

Re: small-block stroker oil pan leaks [Re: 69Cuda340S] #649736 03/25/10 06:24 PM 03/25/10 06:24 PM
Joined: Nov 2006 Posts: 319 Northern Va M Mopar73340 enthusiast
Mopar73340 enthusiast M Joined: Nov 2006 Posts: 319 Northern Va	I have the exact same issue with my 408. I have had the pan off now two times. The last time I used the Kevco pan and magnum gasket. One time it leaks alot the next time very little. I figure it has to be the rear main as everything else is dry. I've built plenty of small blocks (318's and 340's) and never had this problem. The worst part of the whole mess is it didn't leak a drop through 8 dyno pulls and then leaks as soon as installed in the vehicle.

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