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engine swap help

Old January 30th, 2018, 12:31 PM
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engine swap help

Hi I'm new to this I have a 1987 Cutlass supreme that I had since 96 ...with a v6 in it I have almost 800,000 miles on it THAT'S RITE ALMOST 800,000 ON IT I JUS GOT A ...1971 olds 350 n trans .... I want to Kno if it's a good Motor...and I want to Kno what all I have to do to get it running.... I want it to have around 300-400 hp.... I hope sum one can help me....this is my first car I bought....
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Old January 30th, 2018, 01:17 PM
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Welcome, I moved your post to its own thread. Wow, 800k miles, quite the accomplishment. The first question would be is how long has the 350 and transmission been sitting?
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Old February 11th, 2018, 04:52 AM
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Originally Posted by Pete Hall View Post
Hi I'm new to this I have a 1987 Cutlass supreme that I had since 96 ...with a v6 in it I have almost 800,000 miles on it THAT'S RITE ALMOST 800,000 ON IT I JUS GOT A ...1971 olds 350 n trans .... I want to Kno if it's a good Motor...and I want to Kno what all I have to do to get it running.... I want it to have around 300-400 hp.... I hope sum one can help me....this is my first car I bought....
I had a grand prix with that 3.8 buick carb engine. It was no power house but I sold it with 250K and it still ran like new. Did you ever have to do the timing chain? The only thing I had to do on mine was a rear main right before I sold it
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Old February 11th, 2018, 07:21 AM
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Welcome. The Olds 350 is a common swap into the G-body cars. Since you are starting with a V6 car, you'll need the motor and frame mounts from the same year with the Olds 307 motor (the 307 and 350 are externally identical). If your car had a three speed TH200 originally, the TH350 bolts in. If you had a 200-4R the you will need the crossmember for a TH200. Valve cover clearances to the HVAC box will be a little better if you can grab a set of the 307 valve covers. While not mandatory, these are slightly reshaped to improve clearances in the G-body. You'll also want the accessory brackets, pulleys, and water pump from a 307 car to avoid mismatches and belt alignment issues. Good luck.
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Old February 11th, 2018, 10:09 AM
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Originally Posted by Pete Hall View Post
I have almost 800,000 miles on it THAT'S RITE ALMOST 800,000 ON IT
I ain't buyin' it.

That's an average of over 25,000 miles per year every year since the car was new. That's an average of over 70 miles per day every day of the 365-day year.

That's a lot of driving. The '87s still had 5-digit odometers, I believe, so there's no way to show with the odometer what the actual mileage is. (If I'm wrong here, and the car does have a six-digit odometer, it should be a simple matter to post a photo of it showing a 7 or an 8 in the far left position.) You've owned it since '96, which means you've owned it for more than two-thirds of its life. If you have had the car for the last 2/3 of the 800,000 miles, that's about 530,000 miles you've put on it if the miles were put on at a steady pace. If you changed the oil every 5,000 miles, that means you've changed it over 100 times, or about 5 times per year, since you've owned it. Do you have all the receipts for all of these changes?

How about tires? If you averaged 50,000 miles on a set of tires, you ought to have bought tires about 10 times since 1996. Do you have receipts for all those purchases?

Few cars come anywhere close to lasting upwards of 1 million miles. We need some kind of documentation to back up a claim like this.

Last edited by jaunty75; February 11th, 2018 at 10:13 AM.
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Old February 11th, 2018, 10:21 AM
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Originally Posted by Pete Hall View Post
I JUS GOT A ...1971 olds 350 n trans ....

... I want it to have around 300-400 hp....
Well, it's a good starting point but you will need to do a complete rebuild with attention to detail on all of the parts and machine work to reach near 400 HP. 300 HP is relatively easy to achieve, though. The '71 engine had very low compression from the factory (8.1:1) so at minimum you will need higher compression pistons, a good camshaft, an aftermarket intake manifold, and some head work for 400 HP. This will also lead to a torque converter and rear gears to match the engine's operating parameters.
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Old February 11th, 2018, 11:16 AM
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Sounds like the Fedreal Bureau of Investigation will be paying you a visit soon!
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Old February 11th, 2018, 02:39 PM
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Originally Posted by jaunty75 View Post
I ain't buyin' it.

That's an average of over 25,000 miles per year every year since the car was new. That's an average of over 70 miles per day every day of the 365-day year.

That's a lot of driving. The '87s still had 5-digit odometers, I believe, so there's no way to show with the odometer what the actual mileage is. (If I'm wrong here, and the car does have a six-digit odometer, it should be a simple matter to post a photo of it showing a 7 or an 8 in the far left position.) You've owned it since '96, which means you've owned it for more than two-thirds of its life. If you have had the car for the last 2/3 of the 800,000 miles, that's about 530,000 miles you've put on it if the miles were put on at a steady pace. If you changed the oil every 5,000 miles, that means you've changed it over 100 times, or about 5 times per year, since you've owned it. Do you have all the receipts for all of these changes?

How about tires? If you averaged 50,000 miles on a set of tires, you ought to have bought tires about 10 times since 1996. Do you have receipts for all those purchases?

Few cars come anywhere close to lasting upwards of 1 million miles. We need some kind of documentation to back up a claim like this.
well he did say it was the first car he ever bought,so i wonder if he is reading the odometer wrong.and if it does have a 5 digit odo without records there is no way to know.but as a sidenote i have a 2000 vw jetta with 600k on it,i drive on average 50k a year for my job,AND it has been setting for the last 2 1/2 years as i needed a bigger car.so it is possible.
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