My 1970 Oldsmobile Cutlass S

Olds 307 and 403

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Thread starter
Oct 4, 2018
918
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63
Melville, Saskatchewan
Just driving it around, the 1600 stall sucks. I ordered a cheap 2000 to 2200 stall converter. The 403 sounds a lot better with acceptable oil pressure. I just got a box from Cutlassefi. Black ceramic coated headers and my RPM intake converted to SEFI.
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IIIQuaZIII

New member
Oct 11, 2020
5
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How it currently looks. 9 to 1 Olds 350 214/214 cam/TH350C/2.78 open type O rear.
View attachment 642
I have been fogging the back to cylinders with this. View attachment 643
#7 and #8 were 110 psi vs 150 to 155 for the other 6. I gained 15 psi on 8, maybe 5 on #7. No real gain this 3rd time but will use up the can in those cylinders. Either way the 350 will be going in the 88 CSC with the 2300 stall lock up torque converter and maybe the modded governor, should be around 5000 rpm shift points. Also putting the Performer intake back on, 1" open spacer and putting the hot air choke back on, will convert the 260 to electric. Along with a new A/C compressor, condensor, receiver dryer and maybe an evaporator, want working A/C again . Want a fun car to drive and hoping for 20 mpg while I build the 70S. It will adopt the 260 so it can move around. I plan on picking up the longer main studs and a girdle this fall and get the 403 block to the machine shop. Already have cam bearings, just main bearings to assemble the bottom end, will probably get them and some roller lifters from Cutlassefi. I am waffling about using iron heads but already have a set of ported #6 heads with 2"/1.625" valves and filled crossovers. The chambers do need to be enlarged a bunch and I would add new positive seals and springs to match the roller cam. Procomp heads are tempting as well. I was also waffling between a TH350C or a 4L80E. I do have a 2004R that lost 3rd and 4th due to my daughter running it low on fluid. I think building my extra half wrecked 2004R is better than paying $500+ for a questionable 4L80E core that might need rebuilt anyways. I actually HATE it's gear ratios, none are ideal, just like the strength idea of the 4L80E. If I splurge for the billet forward drum, new sun shell, billet 10 vane pump, shift kit, servo, sheet metal pan and big rebuild kit from CK Performance, I will rebuild the 2004R myself and should hold up fine, don't trust the local trans shop. I may go with Dr Dan's 2004R converter he runs, around 2800 stall. I have CK's big manual to help me do this. It may take some time, I do have a somewhat working non functional lockup TH350C, don't want to rush the 2004R build. Then I can run 3.90 gears, 1900 rpm at 60, 2200 rpm at 70 mph with the planned 275/60R15 tires, perfect cruising rpm. What can I say, want the acceleration to be like a sledgehammer and not screaming on the highway. New cars have spoiled me, steep first gear and great OD, want that for my 70S. Plan to have the short block together by Summer but bodywork, paint, orginal Sherwood Green, grills and maybe tail lights are a high priority as well. Also considering the AEM infinity on multipoint EFI but may just use the 750 Street Demon or send my extra Qjet to Everyday Performance. I would also add a wideband, planning on the Stainless Chinese headers and 2.5" dual exhaust to finish it out.
Hey man, how you been doing? IDK if you know what happened to my 403 after it was rebuilt, and rebuilt again. It's a whole story. I think all that happened around the time the second iteration of oldspower.com came out. So, I don't remember what got posted. Those rims will actually look pretty good on that. If they were mine, I think I'd sand off the layer of paint on the top that sticks up on each spoke and polish it. Then paint the recessed area black or whatever color. They should look cool no matter what you do though.
 
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Olds 307 and 403

Well-known member
Thread starter
Oct 4, 2018
918
264
63
Melville, Saskatchewan
I think the choke is finally dialed in on the Qjet. I had to add two washers behind the choke housing. I was leaving it slightly loose, tight the linkage stuck down. I also set the coil tighter, fast idle up a bit and closed up the amount the pull opened. I also cleaned all the chrome, Stainless and adonized trim. Looks pretty good, will take pics tomorrow. This also arrived, 1000 cfm and a 1/4 the price of the Holley TB.
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Olds 307 and 403

Well-known member
Thread starter
Oct 4, 2018
918
264
63
Melville, Saskatchewan
Found screws for the sensors. Looks like a LS style IAC and a TBI style TPS. I pissed around with getting full throttle and smooth movement on the throttle body. It was no where near right, as is. I also used the Permatex Orange thread locker on the the eight throttle plate screws and side linkage. A lot better than how it arrived. I will order sensors and base gasket today and pick up some 5/16" stainless 1" long bolts and washers as well for the four base bolts.
 

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