1972mc Posted April 13, 2009 Share Posted April 13, 2009 My oil pan leaks and have received new pan from engine mfg. They say there was a problem with a supplier. For a standard 7 1/2" pan on a small block --what is the best gasket to use??? Part number would be good. What about checking pan for flatness. What is acceptable? Thanks Carl Quote Link to comment Share on other sites More sharing options...
monte70car Posted April 13, 2009 Share Posted April 13, 2009 Carl a one piece gasket is the way to go. here are some from summit oil pan gasket oil pan gasket 2 main thing it knowing what year you need on rather it takes a thick front seal or the thin front seal. we gave up on our oil leak on the oil pan. Quote Link to comment Share on other sites More sharing options...
footballubet Posted April 13, 2009 Share Posted April 13, 2009 Go with the one piece seal. Ask the supplier which seal for front, thick or thin. And install the gasket dry, no sealer except a small dab at the timing chain to block and rear main cap to block. Don't over torque the bolts, or it can push the gasket out. Quote Link to comment Share on other sites More sharing options...
stangeba Posted April 13, 2009 Share Posted April 13, 2009 Something else to look for is, if a previous owner did over tighten the pan bolts (this applies to all covers) you may have to push the bolt holes back out using a ball peen hammer. I've seen some really messed up rocker covers over the years from being way overtightened. Good luck, Bruce Quote Link to comment Share on other sites More sharing options...
kc8oye Posted April 14, 2009 Share Posted April 14, 2009 There are 3 oil pan gaskets, the Early ones (the thin ones) which IIRC was used up to 1974, then 1975 they switched to the 'thick' style.. and then in 1986 when they switched to one-piece rear mains they went to a massively thick front seal.. so there are techniclly 3 oil pan seals for the 1st gen small block. not counting the LT and LS series stuff ~ Quote Link to comment Share on other sites More sharing options...
Ian Posted April 14, 2009 Share Posted April 14, 2009 Tim didn't you have a post where you had taken measurements and found the right part numbers for each once? Quote Link to comment Share on other sites More sharing options...
kc8oye Posted April 14, 2009 Share Posted April 14, 2009 yep.. right here ian. click on it if it's too squashed. Here is the info for the seal sizes.. (I grabbed it from hotrodders.com) Quote: The size of the seal you need is determined by the pan. Measure from the mounting surface where it bolts to the block down to the deepest part of the seal diameter. 2 1/4" = thin seal 2 3/8" = thick seal Felpro one piece gaskets: Thin seal (up to 1974): Part No. OS34509T Thick Seal (1975 and later): Part No. OS34510T Quote Link to comment Share on other sites More sharing options...
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