[punkin]

Hello all,

Thank you for considering this question. Does anyone know what size bolt is used for the oil filter adapter housing?

Thanks.

[Gary H]

3/8" X 1 1/2" course thread.

[punkin]

I thank you kindly. Have a GREAT day.

[punkin]

Originally Posted by Gary H

3/8" X 1 1/2" course thread.

Do you mind me asking what reference material you have for looking this up?

[steve25]

wow!
I would be very insulted if it was me who answered your question and now your posting back questioning my answer, HS!

[i82much]

Originally Posted by steve25

wow!
I would be very insulted if it was me who answered your question and now your posting back questioning my answer, HS!

maybe he just wants to know where to look stuff up next time?

[4zpeed]

Originally Posted by i82much

maybe he just wants to know where to look stuff up next time?

What ^He^ said...


Frank

[scott70]

people like to jump down other peoples throat in a heartbeat,,,,probably why theres not as many people on this forum as there used to be. Its a turnoff.

[PAUL K]

1 1/2 may work but it is longer than we use. I believe the factory bolts were 1 1/4 and we usually use 1"
The oil filter housing is about .500 thick.

[PAUL K]

Originally Posted by steve25

wow!
I would be very insulted if it was me who answered your question and now your posting back questioning my answer, HS!

Maybe it was bad information.

[i82much]

Originally Posted by PAUL K

1 1/2 may work but it is longer than we use. I believe the factory bolts were 1 1/4 and we usually use 1"
The oil filter housing is about .500 thick.

come on, it’s not that important. what could go wrong?

[PAUL K]

Originally Posted by i82much

come on, it’s not that important. what could go wrong?

If I wanted to try and figure this out I would assume the OP was trying to put his oil filter housing on his aftermarket Pontiac block and wanted to use the correct length bolts. I would also assume the first gentleman gave his answer based off past experience. I would assume after the OP tried to use the first responders (no pun intended) advised bolt length and found out they were the same length bolts he already tried and didn't work (note time of posts). The OP came back and wanted to confirm with the "first responder" (again no pun intended) why he came up with the same length bolt that he already had come up with and for some reason the bolts were way too long. Now with that being said and already knowing that a bunch of aftermarket blocks aren't threaded as deep as a lot of factory blocks and there is a slim chance a 1.5" long bolt is going to work, I figured I'd politely try to help the OP. Also since I am a weight conscious racer (even though I eat too much) I know a 1" long bolt will work with the factory oil filter housing. Also since I have performed many high end stock type rebuilds where the guys want all the correct bolts where they belong and I have a fairly good memory for unimportant stuff, I recall the factory length bolts are either 1" or 1 1/4" long, but pretty sure an inch and a quarter. However if this seemed like a concourse restoration, which it might be (I assumed a lot here) and it'd give the OP a warm fuzzy to know for sure he was wanting the exact correct OEM length bolt I never would've replied in this thread until I was at the shop tomorrow and could post accurate information by checking a correct length factory bolt..... Fwiw

[Sirrotica]

Originally Posted by PAUL K

If I wanted to try and figure this out I would assume the OP was trying to put his oil filter housing on his aftermarket Pontiac block and wanted to use the correct length bolts. I would also assume the first gentleman gave his answer based off past experience. I would assume after the OP tried to use the first responders (no pun intended) advised bolt length and found out they were the same length bolts he already tried and didn't work (note time of posts). The OP came back and wanted to confirm with the "first responder" (again no pun intended) why he came up with the same length bolt that he already had come up with and for some reason the bolts were way too long. Now with that being said and already knowing that a bunch of aftermarket blocks aren't threaded as deep as a lot of factory blocks and there is a slim chance a 1.5" long bolt is going to work, I figured I'd politely try to help the OP. Also since I am a weight conscious racer (even though I eat too much) I know a 1" long bolt will work with the factory oil filter housing. Also since I have performed many high end stock type rebuilds where the guys want all the correct bolts where they belong and I have a fairly good memory for unimportant stuff, I recall the factory length bolts are either 1" or 1 1/4" long, but pretty sure an inch and a quarter. However if this seemed like a concourse restoration, which it might be (I assumed a lot here) and it'd give the OP a warm fuzzy to know for sure he was wanting the exact correct OEM length bolt I never would've replied in this thread until I was at the shop tomorrow and could post accurate information by checking a correct length factory bolt..... Fwiw

I was going from memory, and my answer would have been 1 1/4 X 3/8 USS. But my memory isn't always as good as I'd like to think it is. I don't think 1 1/2 would tighten down, but that's just my opinion, going from from my self confessed already less than perfect memory............

[i82much]

Originally Posted by PAUL K

If I wanted to try and figure this out I would assume the OP was trying to put his oil filter housing on his aftermarket Pontiac block and wanted to use the correct length bolts. I would also assume the first gentleman gave his answer based off past experience. I would assume after the OP tried to use the first responders (no pun intended) advised bolt length and found out they were the same length bolts he already tried and didn't work (note time of posts). The OP came back and wanted to confirm with the "first responder" (again no pun intended) why he came up with the same length bolt that he already had come up with and for some reason the bolts were way too long. Now with that being said and already knowing that a bunch of aftermarket blocks aren't threaded as deep as a lot of factory blocks and there is a slim chance a 1.5" long bolt is going to work, I figured I'd politely try to help the OP. Also since I am a weight conscious racer (even though I eat too much) I know a 1" long bolt will work with the factory oil filter housing. Also since I have performed many high end stock type rebuilds where the guys want all the correct bolts where they belong and I have a fairly good memory for unimportant stuff, I recall the factory length bolts are either 1" or 1 1/4" long, but pretty sure an inch and a quarter. However if this seemed like a concourse restoration, which it might be (I assumed a lot here) and it'd give the OP a warm fuzzy to know for sure he was wanting the exact correct OEM length bolt I never would've replied in this thread until I was at the shop tomorrow and could post accurate information by checking a correct length factory bolt..... Fwiw

that’s a lot of good info. also, my car is held together by zip ties and jb weld. one of these days, i might try adding some bolts

[Sirrotica]

Originally Posted by i82much

that’s a lot of good info. also, my car is held together by zip ties and jb weld. one of these days, i might try adding some bolts

You were probably way ahead of Freibuger and Finnegan, and long before Roadkill.........

They're far from the first people that could butcher a car just enough to get it a few more miles down the road........

They just get paid to do it on TV.

[i82much]

Originally Posted by Sirrotica

You were probably way ahead of Freibuger and Finnegan, and long before Roadkill.........

They're far from the first people that could butcher a car just enough to get it a few more miles down the road........

They just get paid to do it on TV.

i’m exaggerating but honestly some of my hacks have turned out a lot better than the mechanical work that i paid for!

[4zpeed]

Originally Posted by i82much

my car is held together by zip ties and jb weld

Show off...

my bubble gum an duct tape is pert'near as good...



Frank

[jeff chmura]

3/8x16x 28mm...lol.... Sorry but I had to

[lust4speed]

Just don't try those lengths (1-1/2 and 1-1/4) on most stock blocks.

[Dragncar]

I would not even consider using a 1 1/2" long bolt there. TOO LONG,
1 1/2" long bolt could be a problem since I just went out and checked a 67 400 block and the hole is 7/8" deep. And I doubt the threads go to the bottom.
If you have 1/2" of thread on a 3/8 bolt in cast iron you are fine. Rule of thumb is you need as much thread as the bolt is wide. A little more is OK.
There is such a thing as too much thread.