The reason I asked about the carbs is that I wanted to know if this was a typical J2 setup. I'm sure your aware that any J2 is rare because the extra horsepower [over 300] and beefier externals were an option in 1957. At an extra price of $385.00, it was seldom ordered. From what I understand, some production models slated for NASCAR had different set-ups.
I have an extensive collection of material I'm sorting through to see just how rare your J2 is. I also have period literature, brochures, and newspapers.
I want you to know as much as possible about your car, as I understand the benefit in re-sale.
Are there any other numbers you can provide me with to help in this search ?
[ p.s.] I don't know how or why the post changed either.
Do your valve covers look like this ?
Ok, here we go !
This is a picture of one of the 2500 J2's produced between the years of '57 and '58;
These were all known as Golden Rockets. It was a $83.00 option. As you can see, there are no dimples on this J2 motor.
Now, out of these 2500 J2's very few were the competition motor with the heavy duty internals and radical cam, recommended for competition and off road use. It was a $385.00 option. [ in 1957 !] I have been told the competition motor was the one used in this Oldsmobile add;
Now, that doesn't mean that you have the competition motor, as someone might have simply changed them out.
So, I want you to re-check the number on your intake manifold. If it is still 571175, then I would say you have the competition motor. Oldsmobile lists 571145 as the 'normal', but still rare, J2 !
I have not been able to confirm anything on the raised W2 stamped on the intake yet. But, I can't find that same stamp on a 'normal' J2. I am still searching my archives in my attic to find some more information on your engine number. The vin number is XXXXX states you have a 1957,88,with a 371.
Rick: CM568677LW W2 is not stamped on the intake manifoold, it is on the rear third of the block itself just below the exhaust manifold. 571145 is on the intake manifold
Thanks for that information on where you found the CM568677LW W2. I did know you found the 571145 on the intake though, I just thought there was a W2 stamp on it also. Thanks for the clarification, that is why I did not find anything on the W2 anywhere concerning the intake. I did however know that the Cm568677LW was your engine number. Let me put it together with the W2 and see what I can come up with. I will also check out the 261 on the front of the head.
Oh, by the way, do you know you have duplicate questions here at JustAnswer ?
It's 1:54 Am here, but we are at 50 degrees F. here in Lewisville, Texas.
By the way, from 1949 to 1957 Oldsmobile " stamped sequence numbers on the left side of the block on a pad ". It has nothing to do with engine size at all.
This looks like proof positive;
NHRA Technical Specifications
4.000 3.688 371 8 7.000 4/29/2008
Issued: 15 July 1968
HP Disp C.R. Ind. Make Model/Transmission Deck Ht R.R. Lifter Head cc
277 371 9.50 1-4 Roch 4GC-7009471,70,7010925,26/ALL .001 1.8 H 72.0
300 371 10.00 3-2 Roch F-7010960 C-7010959 R-7010958/ALL .001 1.8 H 72.0
312 371 10.00 3-2 Roch F-7010960 C-7010959 R-7010958/ALL .001 1.8 M 72.0
HP Disp Valves Cam Lift Gasket Springs
277 371 1750/1563 419/435 .050 Outer w Damper
300 371 1750/1563 419/435 .025 Outer w Damper
312 371 1755/1563 451/455 .025 Outer w Damper
If you can determine you have a 451/455 Cam Lift, then you know you have the 312 HP motor.
Terry also told me to ask if this could be why this deluxe model has not power steering, power brakes power windows or seats?
It is probably just as I expect, a race car from NASCAR or one of the cross country races in 1957 or '58. I am going to my other storage to look up some other material for your 88 and will come back with more useful information hopefully.
I can't find any other additional information in my resources. I do know you have a very, very rare car. I have found a site you can download a 1957 Oldsmobile shop manual. I feel it would be a good investment for your future return. It's been fun to help you determine the rarity of your vehicle and I will send you any information I gather when I get it. Here's that link, and good luck my friend !