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
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
Supporting Member
Dec 26, 2013
13,085
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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Oct 14, 2008
7,230
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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CuttassG

n00b
Thread starter
Jul 19, 2019
4
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
10,955
113
Socialist NY
Are you even allowed to do any of this to a car of that vintage in Cali?
 
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