My 1970 Oldsmobile Cutlass S

Olds 307 and 403

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Oct 4, 2018
855
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Melville, Saskatchewan
The new headlight plastic surrounds and bezels came in. A PIA for my Wife to pick up from RPM, couldn't go in and only accepted cash or an Etransfer. Two hours later she had them🤔. I also had to get a couple of new speed nuts for the bezel screws. Yes the passenger side fell off driving around town due to the broken down plastic🤗.
Before
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After
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Olds 307 and 403

Well-known member
Thread starter
Oct 4, 2018
855
254
63
Melville, Saskatchewan
Pretty sure I have a line on a good 403. With my 65cc #6 heads with the 2.07" intake valve, bowls opened with upgraded springs with .042" Felpro gaskets should be right at 9 to 1. I also have the 204/214 cam and double roller timing set. I already have all the gaskets as well. I also received all my 2.5" stainless exhaust parts to work with the full length stainless headers. Yes, these are straight through, Flowmaster stainless mufflers. I still plan on some assembly of the 358 after picking up, gasketingz head swapping, painting and installing the 403 first.
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Olds 307 and 403

Well-known member
Thread starter
Oct 4, 2018
855
254
63
Melville, Saskatchewan
So I went and got the 403, very clean on the outside. I also got the short tail 350 on it for $400. He let me take any of the parts. I took the 6 blade clutch fan and triple pulleys. I also got a very nice trans dust cover. The intake and carb aren't stock for this motor. It is off his 79 Custom Cruiser wagon that had a carb fire. Fairly minor, the carb looks salvageable for a rebuild. The guy mentioned he was told the 4A heads were rebuilt. The main caps are marked with yellow dots, pretty sure the whole thing was apart at some point. The timing chain was also replaced. I pulled all the caps to get the rope rear main seal out. The bearings look decent. I am going to use the Canton pan and pickup with the purple spring in the Melling high volume oil pump. Then clean and install the 204/214 cam in the same spot, since I degreed it in the 350. Then clean and install the #6 heads with 2.07" intake valves and the Performer intake. I will also install the new stainless exhaust.
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Olds 307 and 403

Well-known member
Thread starter
Oct 4, 2018
855
254
63
Melville, Saskatchewan
It looks like this motor came from a 1977 Buick orginally. I cleaned everything up and painted VHT Gold Engine Metallic on the 62 and 64cc, what they actually measured #6 heads and the Performer intake. I painted the Serpentine accessories VHT Black Engine Metallic. The Anchor 2261 motor mounts fit perfectly, torqued to 80 ft/lbs. The piston I measured was .025" in the hole. That means I will be just over 9 to 1 compression with the .042" Felpro head gaskets. I need to bend a new fuel line from the pump to carb, I have NiCopper 3/8" line to use. I will get the 350 out, make sure the 204/214 cam looks OK from it and put it in the same place. I may just clean up one of the stock oil pans and save the Canton pan and pick up for new motor, still deciding. It would mean another Melling High volume oil pump and drive shaft for the new motor, not the end of the world. I do want to make sure everything fits with the full length Stainless headers. I realize that will require moving the brake proportioning valve. I also will install the new Powermaster starter. Although the red no name mini has worked perfectly.
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