I’m sorry if this is another topic that’s been beat to death but I’m looking for main bearing for my 425. Im trying to figure out 1/2 groove full grove ect. I can’t remember what I used before on my small block builds but this would a street driven 6k rpm absolute max (probably will never see that). 6qt pan. Bearing selection seems to be engine specific so what are you guys running in your olds engines?

 

According to what you have posted, I would use Mahle Clevite full groove main bearings (#1 main is half grooved 'cause that main journal is cross drilled). Also, I have always used nothing but stock displacement oil pumps with high pressure relief spring on those early 400/425 motors.

 

Ok thanks for the info. I was able to get some clue it’s H series full groove now on to the rods.

 

H series rod bearings shouldn’t be full groove, they’re just more concentric than a P bearing.
Use the Federal Mogul 108M on the mains. They’re 5/8-3/4 groove and offer a bit more clearance.

 

cross drilling mains is unnecessary when using half grooved mains.

 

I did not say it was! I was merely pointing out that the front main journal on second gen Oldsmobile V8 motors was cross drilled from factory and had the half grooved main bearing which is common with a cross drilled main journal. I don't know any of the Oldsmobile engineers that designed the second gen motor so don't know their reasoning. It may be for better load support of the front of that heavy crankshaft when loaded down with accessories, and maybe not!

 

Well I ordered the bearings so I’ll just have to see what shows up. I can always return them.

 

you actually said #1is half grooved “because it’s cross drilled”

 

never seen a grooved rod bearing in my life

 

Correct, that’s what I was inferring, certainly not for an Olds/Cadillac(same bearing for both).
However I believe King makes a full groove for a Chevy something.

 

So or what it’s worth ms-804hx (std. + .001) is in fact full groove.

 

I was wondering why you would even bring such a strange thing up?

 

This is why^^^^^^

 

All Clevite MAIN bearings for Olds are full grooved. Only the FM’s aren’t.

 

it was you who first brought up grooved rod bearings by saying H series shouldn’t be full grooved

my secret decoder ring has figured out what you were trying to say…you meant Mains not rods, and you meant Full grooved, not “shouldn’t be full groove”

other than that, it was a perfect explanation 😂

 

Does your reading comprehension really lack, OR do you just like to read things and let your phobias in your head translate for you.

In fact he said "H series rod bearings shouldn’t be full groove, they’re just more concentric than a P bearing.

Shouldn't is a contraction for "should not", not "definitely are"

I don't read anywhere where he said differently. Your just making stuff up in your head.

I wish I knew what to tell you to Google, but I really do think you can find help or medication for your problems.

Best of luck 🤞

 

why did he bring up a grooved rod bearing in the first place? this was a discussion about grooved mains, not rods….that’s why I asked in the first place

nobody was discussing rod bearings, which are never grooved…then he inserted it. then he said I brought it up?😂

anyway, you’re doing a great job of living up to your screen name. duh and dumber

 

Maybe because the OP mentioned on to rod bearings

So he mentioned rod bearings are not grooved, so what, in this case it's the truth, fact. But you need to prove some thing to him and off you go. Your just plain old not pleasant.

As for me being dumb, you have no clue. I'm a complete ignoramuses.

But you are still you, troubled. Right now your blood pressure pressure is going through the roof, clenching your teeth untill it hurts. Trying to figure out how to get back at me.

The thing is people read your comments and laugh at you.
They read mine and laugh along.

Try taking some Melatonin to help you sleep. I need to go eat some Oreos.