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Hi, just discovered my friend's engine (455) block number (under driver side head).
It's 30M145271, so this is a 1970 olds engine from Lansing plant right? And is it right to say that if 145271 don't match the last 6 digits of is dash VIN then
that engine did not came with this car from factory ?
If it's not the original, is there a way to know exacly from which car it came or what exactly is this engine ?
What I know..
Head are "J" (411783) 73-76
Intake is 404721 (455, 70-72)
It's 30M145271, so this is a 1970 olds engine from Lansing plant right? And is it right to say that if 145271 don't match the last 6 digits of is dash VIN then
that engine did not came with this car from factory ?
It's a 1970 engine. Of course it wasn't factory installed. ALL of the characters on the VIN derivative need to match the VIN of the car.
If it's not the original, is there a way to know exacly from which car it came or what exactly is this engine ?
No.
What I know..
Head are "J" (411783) 73-76
Intake is 404721 (455, 70-72)
So you also know that the motor has been apart before it was put in this car. 404721 isn't an Oldsmobile intake casting number. Look again, it is likely 404521, which is 1970 only BBO. Consistent with the block, but not the car. A 1971 442 would have come with intake casting number 407567.
It's a 1970 engine. Of course it wasn't factory installed. ALL of the characters on the VIN derivative need to match the VIN of the car.
No.
So you also know that the motor has been apart before it was put in this car. 404721 isn't an Oldsmobile intake casting number. Look again, it is likely 404521, which is 1970 only BBO. Consistent with the block, but not the car. A 1971 442 would have come with intake casting number 407567.
Sorry my bad, it is 404521, the car is automatic, so from what I see (see pic) it would be correct no ?
Sorry my bad, it is 404521, the car is automatic, so from what I see (see pic) it would be correct no ?
Thanks Joe
Not sure where you got that list but it is not correct (as are most lists like this on the interwebs). Go back and read what I wrote in post #2. 404521 is 1970 ONLY. It may have been correct for the block you have, but it did not come from the factory on that car.
Not sure where you got that list but it is not correct (as are most lists like this on the interwebs). Go back and read what I wrote in post #2. 404521 is 1970 ONLY. It may have been correct for the block you have, but it did not come from the factory on that car.
That's from the now-defunct 442.com. While there is lots of useful info in there, it should be used on a "trust but verify" basis as it's not all entirely reliable. It came from a variety of sources, some as unimpeachable as our own Joe P. and some ... not so much.
That FAQ was created in the 1980s and early 90s from posts on the old Chubecto listserver site in the prehistoric days of the interwebs. It was never fact-checked, simply compiled from posts on the listserver. As is the case today, much of what was and is on the interwebs is incorrect.
That FAQ was created in the 1980s and early 90s from posts on the old Chubecto listserver site in the prehistoric days of the interwebs. It was never fact-checked, simply compiled from posts on the listserver. As is the case today, much of what was and is on the interwebs is incorrect.
The application is actually referred to as LISTSERV. A server which provides LISTSERV services is referred to as a LISTSERV server. Point of contention maybe...I used to manage a LISTSERV server.
It's a 1970 engine. Of course it wasn't factory installed. ALL of the characters on the VIN derivative need to match the VIN of the car.
No.
So you also know that the motor has been apart before it was put in this car. 404721 isn't an Oldsmobile intake casting number. Look again, it is likely 404521, which is 1970 only BBO. Consistent with the block, but not the car. A 1971 442 would have come with intake casting number 407567.
Hi Joe, found something else on my friend's 71 442 (455 but 70 block and intake), In my first post, I said the head were "J", that is right, but on the other side it's an "E" head !!! (403686). So by the picture below (if spec are not wrong), can it be that it have 2 different size of valve between this pairs of head??
Small difference in CC too ? Is the 403686 head could be the one that came with a 70 engine ?
Thanks
Last edited by Tancuda; October 26th, 2023 at 03:27 PM.
Hi Joe, found something else on my friend's 71 442 (455 but 70 block and intake), In my first post, I said the head were "J", that is right, but on the other side it's an "E" head !!! (403686). So by the picture below (if spec are not wrong), can it be that it have 2 different size of valve between this pairs of head??
Small difference in CC too ? Is the 403686 head could be the one that came with a 70 engine ?
Thanks
Yes, the E head is 1970 (only, not 68-70 as claimed in that flawed list). E heads could have come with big or small valves. J heads were only small valves, along with smaller ports. Not a great combo to have two different heads.
Yes, the E head is 1970 (only, not 68-70 as claimed in that flawed list). E heads could have come with big or small valves. J heads were only small valves, along with smaller ports. Not a great combo to have two different heads.
Thanks Joe, ok "E" are 70 only, I agree for the bad combo here. Will do a compression test on it too.
I have a borescope so I can see inside cylinder, do you think I can distinguish the small from the big valve ?
October 21st, 2023, 09:15 AM
