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Old February 3rd, 2009, 07:15 PM   #1
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Question Should I keep the 307 or uprgrade to 350

Just found out that the 1980 Cutlass that I have is a 307,should I keep it or get a 350.Thanks

Oh another thing any suggestions on this car would be great far as headers,exhaust,intake,etc.

And a good place to get some parts would be very helpful.
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Old February 3rd, 2009, 10:07 PM   #2
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Go to the 350. Eveything on your 307 will bolt up to the 350 also. 307 isn't worth upgrading

Get new motor mounts for your 1980 Cutlass, not the kind of car the 350 comes out of. All SBO are externally the same

Easy swap
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Old February 4th, 2009, 04:24 AM   #3
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I agree with Redog. A 350 will be much better than a 307. Check out Summit for parts.
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Old February 4th, 2009, 05:04 AM   #4
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X3 on the 350
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Old February 4th, 2009, 05:37 AM   #5
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X4 on the 350. Ya gotta post pictures too. We have to see the ride
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Old February 4th, 2009, 08:53 AM   #6
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x5 on the 350. Look for an 72 or earlier engine, or at least early heads. The chamber size on 73 and latter heads got huge and will result in a poor compression ratio.

why not go with a 455. it's only a little more money to build.
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Old February 4th, 2009, 09:15 AM   #7
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X6 Get the 350.
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Old February 4th, 2009, 09:45 AM   #8
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Thank you all for the input,What would I have to change to put the 455 in the 1980 Cutlass.I will post some pics later.
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Old February 4th, 2009, 12:26 PM   #9
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iirc a 455 will drop right in. you need to get the engine with the accessory brackets , the exhaust manifolds and the crossover pipe as they are different. Im sure someone will chime in on which headers would fit the best. Also if you run headers on either engine you will probally need a double hump crossmember. summit and others have them
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Old February 4th, 2009, 01:06 PM   #10
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Nobody suggested the 403?...would be my choice if I wanted to keep it a small block.
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Old February 4th, 2009, 02:38 PM   #11
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403s are excellent motors as well. They are just a little bit harder to find than a 350.
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Old February 5th, 2009, 12:44 AM   #12
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You just have to watch the height and width on a 455.

a 455 is 2 inches higher and 2 inches wider than the small blcok
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Old February 6th, 2009, 02:34 PM   #13
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Cool 1980 Olds Cutlass

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Originally Posted by citcapp View Post
X4 on the 350. Ya gotta post pictures too. We have to see the ride
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Old February 8th, 2009, 12:41 PM   #14
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I think I might have a full set of "clip on" center caps for those Oldsmobile wheels if you are interested.
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Old February 8th, 2009, 02:46 PM   #15
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350 would be the easiest to swap in.

Love the velour interior.
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Old February 8th, 2009, 03:03 PM   #16
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As long as the car runs and drives, use what you got. When the pup finally give up the ghost...Thats another story. There is nothing wrong with a small engine in a daily driver, done right a 350 will outperform a 307 any day probably with better economy. the only 307 I've ever ran was an odd duck Chevy, and that info came from the previous owner of an early '70's truck, I never confirmed it.
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Old February 8th, 2009, 04:00 PM   #17
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Center Caps

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I think I might have a full set of "clip on" center caps for those Oldsmobile wheels if you are interested.
yes I would be interested in them,How much??$$
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Old February 8th, 2009, 04:06 PM   #18
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After looking at the pics, I'm guessing that unit is a project already, if so then I recant last post and vote 350 or 403 if you can find one. Nice ride don't see too many of those around here anymore.
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Old February 8th, 2009, 04:06 PM
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