1978 cutlass supreme brougham motor swap

Rebuild original motor or swap

  • Rebuild engine 4.3 v8

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CuttassG

n00b
Jul 19, 2019
4
0
1
California
Hello folks how’s it going, I just got a deal on a 78 cutlass supreme brougham the engine has a rod knock I was hoping to get some info on rather to rebuild the v8 4.3L 260 motor or swap it out with maybe a Chevy 350 block OR WHAT OTHER MOTORS ARE CAPABLE FOR THE JOB if so what all would I need for the motor swap and transmission swap if needed AND ALSO where can I find engine parts online or in the California area area codes 916 to 559 and all in between please and thank you
 

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fleming442

Captain Tenneal
Dec 26, 2013
13,046
24,214
113
Nice Cutloose. Your 260 is probably an Olds engine; is the oil fill a vertical pipe behind the water pump? Sure it's a 6 not an 8? If so, a 403 would be your easiest an best bang for the buck. Then, there's the trans and rear gears to address.....
As an Olds die hard, I cannot and will not endorse a Chevy swap, though.
 
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1bad79

Royal Smart Person
Dec 3, 2011
1,023
890
113
Allendale mi
Put a olds 350 or 403 in it if it has a olds engine now if you put a Chevy engine in it the car will reject the transplant and die
 
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Oct 14, 2008
8,806
7,746
113
Melville,Saskatchewan
Can he swap an Olds 350 or 403 legally in California? The Olds 350 was available in the 79 H/O in California too, I believe. The 350 was made up to 80, was in the 442 that year. The 403 was 77 to 79 but not available in the Cutlass after 77. The 260 is a tiny bore motor, over 200 hp would be very difficult, if not impossible. This may be the one time, cringe, a LS swap might be the easiest and most legal route. I believe Bernard Mondello is in California and may be able help you find an Olds V8 if the swap is possible.
 
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1bad79

Royal Smart Person
Dec 3, 2011
1,023
890
113
Allendale mi
Oh crap I didn’t see he is in California, move out of that state and the possibilities are endless
 
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CuttassG

n00b
Jul 19, 2019
4
0
1
California
Nice Cutloose. Your 260 is probably an Olds engine; is the oil fill a vertical pipe behind the water pump? Sure it's a 6 not an 8? If so, a 403 would be your easiest an best bang for the buck. Then, there's the trans and rear gears to address.....
As an Olds die hard, I cannot and will not endorse a Chevy swap, though.
Thanks for the reply, I’m convinced with the 403 motor I’m looking for one online at the moment.. so if I do get my hands on a 403 block would it be able to mate to my transmission I’m not sure what transmission I have but I know have the v8 4.3 litter 206 block and also would I need to change out the brackets as well?
 

TURNA

Rocket Powered Basset Hound
Jul 24, 2009
10,941
19,990
113
Socialist NY
Are you even allowed to do any of this to a car of that vintage in Cali?
 
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