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Michael and his 1935 Coupé

Old February 22nd, 2019, 04:51 AM
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Michael and his 1935 Coupé





Hello, my name is Michael and I have been screwing around with US classics for many years. Currently I am restoring a 1935 F35 Coupe with 3 windows and suicide doors. I'm thinking about replacing the original engine with a 257 in-line eight cylinder, does anyone know more about the High Compression lettering on the cylinder head? Greetings Michael
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Old February 22nd, 2019, 06:27 AM
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Michael, that's an AWESOME project. Definitely [email protected]$$!
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Old February 22nd, 2019, 06:29 AM
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Welcome aboard

Cool project
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Old February 22nd, 2019, 07:22 AM
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Originally Posted by hgc.micha View Post

I'm thinking about replacing the original engine with a 257 in-line eight cylinder, does anyone know more about the High Compression lettering on the cylinder head? Greetings Michael
The F-35 has a six cylinder engine . Putting an in line eight cylinder engine would be next to impossible . The eight cylinder cars ( L-35 ) were slightly longer . 121 " wheelbase , compared to the F-35's 115 ".
The difference in length was in the distance from the cowl to the front crossmember where the radiator is and where the engine front mount is .
The frames . hoods , hood side panels , and front fenders are all different .
A better choice would be a 257 cu. in six cylinder engine from a '49 or '50 Oldsmobile "76" .
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Old February 22nd, 2019, 07:30 AM
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Welcome to the group... Definitely a cool project vehicle...
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Old February 22nd, 2019, 07:46 AM
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Welcome to the site, awesome project.
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Old February 22nd, 2019, 10:36 AM
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Welcome and that is going to be a neat car. A lot of guys would be making that into a street rod and it would make a great one. Glad you are saving it. Charlie Jones gave you some good advice. The 49-50 engine is a big improvement over the one you have. One of the biggest improvements is the later engine has inserts (rod bearings) instead of poured babbit rods. I had a former acquittance that put a 49 engine in his 31 couple and there were a couple of modifications he had to make but i don't remember what they were. He as very happy with the result. The biggest problem will be finding that 49-59 engine that is rebuildable. Good luck and keep us posted.
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Old February 22nd, 2019, 01:05 PM
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Originally Posted by redoldsman View Post
One of the biggest improvements is the later engine has inserts (rod bearings) instead of poured babbit rods.
According to my 1941 Olds parts catalog , all 1933 and up Oldsmobiles had insert bearings .
And , '28 thru '32 six cylinder Olds could be converted to insert bearings by using F33 or F34 rods .
Just something for future reference .

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Old February 22nd, 2019, 01:35 PM
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That F35 engine is a great running engine with plenty of power. I don't see a later six being that big of an improvement. I have owned a F35 sport coupe for 45 years the biggest performance improvement I would like to make is an overdrive. They are geared so low [something like 4:55] they are really humming at 60 MPH.
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Old February 22nd, 2019, 02:40 PM
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does anyone know more about the High Compression lettering on the cylinder head?
According to the numbers on the head , this engine came from a 1948 Oldsmobile "98" .
After WWII , "premium" fuels were coming in to vogue . Oldsmobile took advantage of that by offering a " high compression "
cylinder head in some models . This head gave greater power AND economy , over the "standard " head when used with premium .
BTW , the head was cast just after midnight on April 16th , 1948 .

Last edited by Charlie Jones; February 22nd, 2019 at 02:42 PM.
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Old February 22nd, 2019, 03:39 PM
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Charlie I had read somewhere (probably an erroneous post) that Olds started using inserts in 1937. I guess it is a moot point since the OP has a 1948 engine already.
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Old February 22nd, 2019, 04:03 PM
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Originally Posted by garykrig View Post
the biggest performance improvement I would like to make is an overdrive. They are geared so low [something like 4:55] they are really humming at 60 MPH.
Actually , there MIGHT be a way to do this . This is only theoretical , so please check and measure before actually attempting this , or even purchasing parts to do it .
A '37 or '38 Olds (or Pontiac ) rear axle would have to be installed . This may very well involve moving or even swapping the spring pads on the housing .
Then a 1940 thru '47 rear end center section (chunk) from a " Hydra - Matic " car would have to be installed in the '37 or '38 axle . These came in ratios as " high " as 3.42 to 1. and they drop right in . 1948 thru '56 rear center sections will also fit a '37 or '38 axle with minor modifications such as grinding the housing somewhat to get the ring gear in and using studs with two different sizes on each end to fasten the center to the housing .
I actually did this on a 1937 Pontiac and put a '54 Pontiac Hydra - Matic (3.23) center in it .
It was a little slower accelerating , but it would cruise easily at 65 MPH .
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Old February 22nd, 2019, 11:53 PM
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Thank you very much for your greetings and helpful information. The original engine from 1935 is still in the car. The row eight from 1948 is in my garage.
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Old February 23rd, 2019, 04:49 AM
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What's wrong with the original motor?
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