Technical Can't figure out a gasket

I have a conundrum! I ordered an oil pan gasket from Speedway for what I thought was a '77 350.

When I took off the pan and old gasket, and then dry-fit the new one, I realized it didn't fit the rear part of the oil pan at all. Like I have something completely wrong.

I don't have any history on the engine, who had their hands on it, or what they've done since the '70s. I identified the engine (through research and your guys' help) using the casting numbers V0207CUB 3970010 A27 as '77, but my dipstick is on the right, which means it would be an '80 or later.

The gasket has a hole for a dipstick on either side (although not big enough so I'd have to cut it out a bit) and it says the gasket should fit an SBC '75 - '85, so it shouldn't matter. I have NO idea where to go from here other than ordering a gasket from another company and hope for the best

 

pictures?

Do you have the part number from the box the gasket came in?

Does it look like it fits a later one piece rear seal engine?

 

Part #91010223

Speedway Small Block Chevy Oil Pan Gasket, 1975-1985 One-Piece

It seems that it's for an oil pan where the dip in the rear is much deeper than mine. The rest of the gasket fits great!

 

Sump patterns are
pre 1980 left dipstick
1980-5 right dipstick
Post 85 one piece rear main seal.


I’m guessing your engine doesn’t look like Squirrel’s pic?
For comparison this is a two piece rear main seal

 

Stupid question. Have you got the gasket arse about face?

 

gonna need some pictures of your engine with the gasket sitting on it....

 

I had it on so the dipstick would end up in the relief designed in the gasket. I didn't take any pics and can't at the moment. This is why I'm baffled, according to the numbers the engine was made in February of '77, but the dipstick location would say later than '80.

In reality, it shouldn't matter because it's the same gasket for all of those years!

 

Have you got an aftermarket sump? Could it be the front that doesn’t fit? Some sump pans use a thinner front seal.

https://www.speedwaymotors.com/amp/...nd-thin-oil-pan-gaskets-which-do-i-need/28651

 

I'm pretty sure I have some RH oil pan gaskets left over from some rebuild kits. If you're interested, they're free, but a little bit for postage would be appreciated. Let me know if you're interested and I'll see what I have. I don't know if I have the end seals though.

Lynn

 

The description and pictures show that fit but I can never figure out why guys order Speedway stuff when they can walk in their local parts house and this time get a
FEL-PRO OS 34510 T
and be done. for the same cost when you add Speedways shipping.

 

It's the only shop in the universe. And they make everything.

 

Thanks Lynn, very generous! If I have to get end seals anyway I think I'll get a one-piece. I never used one before but am going to give it a shot.

 

I just ordered the Fel-Pro from the local auto part store and can pick it up in 30 minutes. I really hope this one is an exact match. I can't get to it until Sunday, but I'll let you know how it turns out! Thank you again!!!!

 

I hope you can post pictures at some point. I’ve assembled plenty of these engines, and I’ve never had any problem finding a gasket that fit them.

 

I can't recall specifics, oil pan differences?

 

The info for that is here.

 

So I bought a Felpro rubber one-piece crush-proof gasket and used that. It was only slightly different than the gasket from Speedway, but I got in a bit easier. Hopefully, I got the little square tabs in the locations correctly but I won't know until I'm ready to start it sometime this spring.

Thanks again fellas!!!

 

Glad you got it sorted!

Well, it’s gonna take me about three days to find a spot in my schedule to drive across town to the store, then there going to tell me they’ll get it from the warehouse and have it tomorrow, because in 2024 sbc stuff surprisingly is not on the shelf anymore a lot of the time, I find a spot in my schedule to make to back to the store to pick it up and pay more than speed way plus shipping with out including fuel etc.


Sometimes you just need the part sooner than later.

 

I started using the parts store's website to order it, then go pick it up. It may be cheaper somewhere else but we need parts stores to continue to exist! Also, by ordering online first, I can find out which store has it in stock, then go right to that store to get it rather than driving around from parts store to parts store. As a bonus, the part is usually cheaper or offers a discount code if you use the website rather than just walking in