CUTLASS 84 supreme 305 swap (need help)

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84Cutlassupreme

Not-quite-so-new-guy
Apr 25, 2020
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I have an 84 cutlass supreme my 3.8 has a crack in the block so im going with a 305 i need info and hints about the swap especially the wiring
 

Turbo Zach

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Sep 8, 2015
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50130
The transmission is a different bolt pattern. Every thing else can be rerouted to work. You will also need a complete engine. Very little will interchange between the two.
 
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ssn696

Living in the Past
Jul 19, 2009
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What are your goals? What is your budget? What's the condition of the rest of the car? Emissions controls in your area?

You might find a running car with an Olds 307 motor in it.
 

fleming442

Captain Tenneal
Dec 26, 2013
13,054
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If you're doing a chevy swap, don't dick around with a 305. You're just adding 2 more crappy cylinders.
Not to mention, if you're in CA, you're screwed, anyway.
 
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ssn696

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The majority of the engine harness will be similar, but the routing will need to be reworked and some of the wires may need to be extended. These diagrams are for a Chevrolet, but they should be similar to the Olds.

I assume you are starting with a Buick V6 - distributor in the front. Not much will exchange. Need the V8 fan shroud and motor mounts as well. The transmission will need an adapter plate or buy the whole drivetrain complete with belts and pulleys. Consider a 700-R4 with a computerless lockup kit - buys you better acceleration without changing the highway gears in the axle. Lots of other suggestions but I'll defer to your original question.
 

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Doug Chahoy

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Nov 21, 2016
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I take it you already have the 305? Other wise we can’t understand why you not going bigger/better. Granted the 305 is better than what is in the car. A good majority on here have pulled the 301s,305s,and 307s for the more powerful bigger engines. Not criticizing ATALL, it’s your ride do what pleases you.
 
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