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Old 06-11-2013, 08:41:38 PM   #1
SpeedAddict02
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Question 1 pc. oil pan gaskets

I haven't had my 400 apart yet and dont remember from my last one.. But it is an 817 block, '74-'76... Anyone know if they used a thin or thick front seal?? I need to know so I can order the correct 1pc. oil pan gasket set..

thanks in advance
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Old 06-11-2013, 08:46:11 PM   #2
Damon
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That depends on your pan. Somewhere around 1974-75 they switched from the "thin" to the "thick" pan gasket and ALL of the difference was due to the change in the pan design around the front "half moon" arc.

If it's an aftermarket pan, it always takes the thick gasket.
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Old 06-11-2013, 08:49:43 PM   #3
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ok thanks.. Pretty sure it's a stock pan.. Guess I'll just have to double check it next time I'm at the garage.
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Old 06-11-2013, 09:52:05 PM   #4
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Use the old gaskets you take out as your guide. Just remember that the end seals on a one-piece gasket appear much thicker than stock end gaskets. They have "lips" on the front and back and are designed to "squish" more than hockeypuck-hard stock end gaskets.
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1990 454SS pickup. Original "tow truck motor" 454 upgraded to something a little more "aggressive." Seems pretty stout but the fuel bill is nuts.

78 Malibu. Inherited with only 35K on the odo! Mild 383 with Weiand 142 blower on top. Mid 12s appears to be the best it's gonna do on street rubber. Runs so good I may never drive it again.

"Last remaining QJet tuner on planet Earth!"
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Old 06-12-2013, 08:06:39 AM   #5
Randy 81
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Here is one way to tell which seal the oil pan uses (from the web):

Determine the front seal surface radius by measuring from the pan rail flange surface (no gasket) to the 6 o'clock position on the seal surface. If it's 2-1/4", it takes the "thin" front seal; if it's 2-3/8", it takes the "thick" front seal.
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Old 06-12-2013, 08:49:21 AM   #6
middleagecrisis
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Quote:
Originally Posted by Randy 81
Here is one way to tell which seal the oil pan uses (from the web):

Determine the front seal surface radius by measuring from the pan rail flange surface (no gasket) to the 6 o'clock position on the seal surface. If it's 2-1/4", it takes the "thin" front seal; if it's 2-3/8", it takes the "thick" front seal.

Good info Randy! I'll have to keep this in my files for future reference.
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