Moroso oil pan not clearing stock rear main cap? Pics inside

[5.0calypso93lx]

So the pickup stud ended up being way too long, but that's the least of my issues. I found out where the pan is hitting, or actually not clearing:



http://i446.photobucket.com/albums/qq188/bad306lx/IMG_1576.jpg (http://s446.photobucket.com/albums/qq188/bad306lx/?action=view&current=IMG_1576.jpg)

http://i446.photobucket.com/albums/qq188/bad306lx/IMG_1577.jpg (http://s446.photobucket.com/albums/qq188/bad306lx/?action=view&current=IMG_1577.jpg)

http://i446.photobucket.com/albums/qq188/bad306lx/IMG_1578.jpg (http://s446.photobucket.com/albums/qq188/bad306lx/?action=view&current=IMG_1578.jpg)

http://i446.photobucket.com/albums/qq188/bad306lx/IMG_1579.jpg (http://s446.photobucket.com/albums/qq188/bad306lx/?action=view&current=IMG_1579.jpg)







So as you can see, the pan isn't clearing the rear main cap. It's a 1971 351w block using the stock main caps so I have no idea why this isn't fitting. There is a quite a big gap on each side of the rails at the rear.



I have no idea what to do at this point....

[Rick93coupe]

I cant see the pictures very well on my phone, I'll check them out tomorrow. It does seem odd it doesnt fit though, Is it a standard 8 qt moroso pan?

[5.0calypso93lx]

I cant see the pictures very well on my phone, I'll check them out tomorrow. It does seem odd it doesnt fit though, Is it a standard 8 qt moroso pan?

It's the 7 quart 20520.

http://www.summitracing.com/parts/MOR-20520/

This is even the pan that's supposed to clear 4 bolt mains on all 5 caps!!!

[5.0calypso93lx]

What else I don't get, is I took the pan up to BES cuz I had to pick up my heads anyway and Brian fitted the pan onto a Dart blocked 351w stroker motor with 4 bolt mains and a windage tray and the pan cleared and fit perfectly????

[Rick93coupe]

7 qt, my bad. It's been awhile, lol. I know you cant just set it straight down on my motor, you have to play with it a bit to make my go on. I bet it's just how your setting it on.

[5.0calypso93lx]

7 qt, my bad. It's been awhile, lol. I know you cant just set it straight down on my motor, you have to play with it a bit to make my go on. I bet it's just how your setting it on.

As it sits, the pan is where it needs to be. All the bolt holes are perfectly aligned in that pic.

[331TwistedWedge]

you're holding your mouth wrong ...

[Timido]

If the pan is new I would call moroso ASAP.

[5.0calypso93lx]

Come to find out, this pan does NOT fit the older blocks with the two piece rear main seal! Moroso doesn't specify this anywhere so I went ahead and bought this pan.

The rear main cap is slightly larger on the older 2 piece rear main blocks so that is why it isn't fitting.

Brian at BES found an older block at the shop and tried the pan on that block and ran into the exact same issue.

I sent the above pictures to Moroso and they got back to me this morning, which I was very impressed with. They told me to send the pan back and they'll send me out a new one as soon as they receive mine.

Problem is, I've already had a -10 return bung welded onto this pan so I'm not sure how that is going to work out....

[Rick93coupe]

Seeing the pictures makes all the difference in the world. I never noticed an issue with mine but I'll be checking to see if I can slide a feeler guage between my pan and gasket tonight when I get home. I'll let you know what I find.

[5.0calypso93lx]

Seeing the pictures makes all the difference in the world. I never noticed an issue with mine but I'll be checking to see if I can slide a feeler guage between my pan and gasket tonight when I get home. I'll let you know what I find.

Yea, let me know what you find out. For me, it was clearly noticeable that the pan just didn't fit right and seat with the block.

I'm very impressed with Moroso's customer service. I just got off the phone with Bill P and he told me to send the pan back and that he'll send me a new one out with a -10 return bung welded on the pan and he said he'd make sure it'll fit an older block.

[Rick93coupe]

Wow, that surprises me. That is good customer service!

[5.0calypso93lx]

No kidding, sent them pics last night, had an email waiting on me this a.m., called them with a few other questions I had an hour later after I read the email and I'll be sending the pan back to them on lunch!

[Rick93coupe]

I was wrong, I have a Canton pan.

[Timido]

That is good customer service. I have heard good things about moroso before. I guess that is one of the reasons they have around for so long.

[5.0calypso93lx]

Yea, they should be getting the pan tomorrow, so we'll see how they take care of me.

I'm wondering if the new OS34506R oil pan gasket will work with this older rear main cap?

[5.0calypso93lx]

Does anyone have a 69-74 rear main cap and a 75+ rear main cap laying around by chance that can be compared? Or even a 75+ rear main cap that I can compare to mine?

I think my luck may have run out and I may have spoken too soon...

[Rick93coupe]

The gasket will be fine. The only difference in early and late models is the 1 or 2 piece rear main seal.

[5.0calypso93lx]

The gasket will be fine. The only difference in early and late models is the 1 or 2 piece rear main seal.

Ya, I'm just a little concerned that if the rear main is a physically different size, if that affects the gasket as well?

I'm just pretty frustrated right now, the guy at Moroso told me to send it back for sure after he saw my pics that I sent him.

They got the pan today, fit it on a mid 80's 351w block they have laying around and said it fit fine and that I should just go ahead and use the gasket to fill the gap as well as some sealer.

I said that's great that it fits your block and it fits on a dart block fine also, but I have a 71 block with a two piece rear main and by the fitment issues i'm having, I'm going to make the assumption that the two piece rear main caps are slightly different size than the later 1 piece rear main caps.

I called Brian at BES and he confirmed that that is just too big of a gap to make up with some sealer and a gasket, especially with the crank case pressues this motor will eventually see. I called Moroso right back but didn't get anyone and left a voicemail to have them call Brian.

Just pisses me off that the guy flip flopped on his technical opinion once he got the pan back and saw that all of their pans are the same way. I'm not mad that the pan doesn't fit, maybe the honestly didn't know that the older rear main cap was slightly bigger than the new stuff, but once you see there is a problem and don't have a solution, don't just say screw it, make it work...