Wrong Fel-pro one piece gasket? - Chevy Nova Forum
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Old 25th-February-2009, 11:43 PM   #1
therooster
 
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Angry Wrong Fel-pro one piece gasket?

I just installed a new Fel-pro gasket part # OS-34509 T (thin seal) on my 69-79 350 4-bolt block. I got everything tightened up noticed that the front journal has a small gap. I heard the thick seal is for the newer 350's (OS-34510 T) but it seams like the thick one will make up that gap. The rear journal looks to be seated ok (kinda hard to see). Could it possibly be my front cover is from a newer 350? Are they different?
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-Nick
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Old 25th-February-2009, 11:51 PM   #2
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Old 26th-February-2009, 05:25 PM   #3
fujimook

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Just installed a new oil pan on my early 327 and what I found was that front seal thickness is dictated by the pan, not the timing chain cover. 55-74 sbc's used the thin seal (felpro 34509t) and 75-85 used the thick front seal (34510t). If you're not sure what you've got, lay a straight edge across the front oil pan rails and measure down to the pan seal lip. 2 1/4" uses a thin seal and 2 3/8 uses a thick seal. 86 & later use a thick front seal but require a 1pc rear main seal. FWIW, found the least expensive 34510t @ O'Rielly's; about $22 + tax.

Hope this helps.

john
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Old 9th-March-2009, 09:42 AM   #4
67-CII
 
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Been There Done That

Have a 74 3/4 Ton 350 4bolt but the guy who owned it before me replaced the oil pan with one from 75+ that requires a thick seal (OS34510).

Found this out the hardway!
I was replacing timing chain, water pumpt etc. but not the oil pan gasket since that had recently been done by previous owner so I never noticed the space in the front seal but was suprised at how easy I was able to work the seal in without droping the pan front. Drove truck around the block and she was bleedin like a stuck pig. Oil everywhere!

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