71conv442

NOT a W30, a straight 442, auto TH400.

Was it possible that they came from the factory with the 407567 intake, and the 7041251 carb?

First post, newbie.

BlackGold

All 1971 442s came from the factory with an intake manifold with casting number 407567. Those with manual transmission had an extra hole drilled in them (for PCV) which changed the part number to 407568, but the casting number remained the same.

The way I read the engine assembly manual, a non-W30 '71 442 should have a 7041257 carb. The '251 carb would be used in other A-bodies with 455 and in Delta 88s and 98s.

joe_padavano

What? There's a 1971 442 that ISN'T a W-30?????

That's about as rare as a 1968 442 without W-36 stripes...

71conv442

That isn't possible?

vin: 344671M180294

jensenracing77

What they are saying is that almost everyone has added W-30 parts and cloned a W-30. Not many left that are a 442 and not cloned as a W-30. just some sarcasm. We all love pictures if you can post some. Welcome to CO.

71conv442

Here is a pic of 71 442.

Qwik71442

very nice!!!

Daverd

7041257 carb is for 71 442 automatic
And 442 with w30 and automatic

joe_padavano

Yeah, no comment on you or your car, just on the folks who have to turn every 442 into a "W-30". Welcome.

71conv442

Thanks, took me a minute to catch the sarcasm. lol

dmullin

Believe it or not, there are 2 70 442s in my town of 2500. Neither has a w25 hood.
Both 34487


I thought people were joking about this w 30 clone trend. But then I looked at hemmings. I couldn't find a regular 442.

joe_padavano

Yeah, the [SARCASM] [/SARCASM] HTML tags still don't work on this site...

I'd probably pizz off a lot fewer people if they did.

jensenracing77

lol, I am the only goofball that is going the other way. My other "real" undocumented W-30 is being turned into a 442.

Looks like a great car 71conv442

11971four4two

Nice car not a fake w30 or ram air added aberration!
happy motoring

sammy

Nice 442!
Welcome to CO neighbour!

Texas442

Love the center hood stripes

Rocketbrian

Welcome from the east coast and what a beautiful car. Always nice to see non W30 442s and 71 models especially. I may be a bit biased! My 71 under restoration will also be maintaining it's centreline hood stripe.

mmurphy77

My '71 442 retains it's non-W25 hood and center stripe also.

72xw30

Beautiful car!

4speed455

M in the vin. Are you sure it's not a w30? Maybe the last owner took all the w30 stuff off. If it were me I would put them back on just in case.

71conv442

I trust this is more sarcasm

The car has the correct 442 cast intake, the correct G heads, vin matching block, exhaust manifolds, transmission and rear end.

It does have the 7041251 carb, and not the 7041257. Which is why I originally asked the question of whether some 442's came with the 251, everything else seems to be correct (I believe the air cleaner is a reproduction).

I would be interested in an original air cleaner and the 7041257 carb if anyone is looking to part with them...

507OLDS

I talked about this a few years back with some other guys that have owned some regular 71 442's,and also 71 W30's. We came to the conclusion that the regular,non-OAI 442's might have come with the 251 carb,and the W25 & W30's came with the 257. I believe the 71 SX also came with the 251.
Your car supports that theory.

1971 442 convert

Welcome to the site looks like we have pretty much the same car and were pretty close to each other. Sorry about the sarcasm some guys just can't help themselves. I understand when you first join that the sarcasm seems a little weird but this is a very good site for any help or info and the guys are great.

jensenracing77

The original 71 non OAI hood 442s had a dual snorkel air cleaner. This was a one year only air cleaner. I do have one for sale if interested. It needs repainted but it is a solid one.

BlackGold

Am I reading it right: the date code on your carb reads 0711? If so, Rochester Products built that carb on the 71st day of 1971, which would be very late for a car with sequence number 180294.

Except ...... there was a big UAW/GM strike early in the 1971 model year which really screwed with production (and could also explain why some cars got parts they weren't supposed to).

Bottom line: if you have some documentation of the build date or delivery date of your 442, and if that date precedes the carb's build date, then the carb was not original to the car. If the carb's build date precede's the car's, then it might be original.

Jamesbo

Welcome aboard. Nice ride

vette442

Two year air cleaner. 1972 455 4 speeds without OAI used the 'NH' dual snorkel too.



Welcome to the OP - that's a beautiful car.

Terry

Rocketbrian

Gee, I hate to blow that theory, but my regular 71 442, very early build has the 257 carb. You are right about the SX, as mine has the 251.

71conv442

Is it possible that in 1971, some 442's came with the 251 and some with the 257? Are they they dramatically different carbs?

dc2x4drvr

That's a beautiful ' 71, does the mirror look "right"? Seems too tall.

Texas442

Does anyone know what is the exact difference between the 1251 and 1257 carbs?

11971four4two

The car will never know the difference and will be happy with a 251.
The 257 will drain your wallet and perform the same way

my 71 has 257carb

Allan R

No sarcasm coming to you from me - that's a stunning looking 71 442! Just an info item for you (and others who may not know), the center hood stripe is part of the Y73 appearance option and was only offered on the 71 model year. It was standard on 71 442's without the W25 OAI hood. BTW, your hood also has the proper Oldsmobile script on the DS front. That was also a requirement of the 71 442 without OAI.

Please post more pics of your 442! It's a beauty!!

507OLDS

They used the same casting numbers,so it must be the selection of the jets & rods.

Mr Shifty Sidney

Anyone have an original non W 71 442 with a manifold other than 407567? I was trying to help a friend find the correct intake for his 71 442 a while back. I checked the one on my 71 442 and the casting number matched the one he had. I do not remember the casting numbers but his car and my 71 had the same intake, but it was not the 407567. I do not think I tried to verify with date code.

Don W

BlackGold

For a given model year, the differences are typically jets and rods, sometimes choke coil, sometimes vacuum break. If it's important to you, let me know and I'll try to look it up.

mmurphy77

To continue blowing that theory, my regular '71 442 is a very LATE build and also has the 257 carb.

507OLDS

Are they both OAI?

mmurphy77

Non-OAI.

507OLDS

Are they both built in Lansing? Just trying to determine some sort of pattern.