Should I keep the 307 or uprgrade to 350

gscott819 · February 3rd, 2009, 08:15 PM

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.

Redog · February 3rd, 2009, 11:07 PM

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

Olds64 · February 4th, 2009, 05:24 AM

I agree with Redog. A 350 will be much better than a 307. Check out Summit for parts.

Oldsguy · February 4th, 2009, 06:04 AM

X3 on the 350

citcapp · February 4th, 2009, 06:37 AM

X4 on the 350. Ya gotta post pictures too. We have to see the ride

jaysun · February 4th, 2009, 09:53 AM

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.

f-85 · February 4th, 2009, 10:15 AM

X6 Get the 350.

gscott819 · February 4th, 2009, 10:45 AM

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.

jaysun · February 4th, 2009, 01:26 PM

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

Oldsmaniac · February 4th, 2009, 02:06 PM

Nobody suggested the 403?...would be my choice if I wanted to keep it a small block.

Olds64 · February 4th, 2009, 03:38 PM

403s are excellent motors as well. They are just a little bit harder to find than a 350.

Redog · February 5th, 2009, 01:44 AM

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

gscott819 · February 6th, 2009, 03:34 PM

Quote:

Originally Posted by citcapp

X4 on the 350. Ya gotta post pictures too. We have to see the ride

Oldsguy · February 8th, 2009, 01:41 PM

I think I might have a full set of "clip on" center caps for those Oldsmobile wheels if you are interested.

gearhead1218 · February 8th, 2009, 03:46 PM

350 would be the easiest to swap in.

Love the velour interior.

csstrux · February 8th, 2009, 04:03 PM

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.

gscott819 · February 8th, 2009, 05:00 PM

Quote:

Originally Posted by Oldsguy

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??$$

csstrux · February 8th, 2009, 05:06 PM

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.

February 3rd, 2009, 08:15 PM	#1 (permalink)
gscott819 Registered User Join Date: Feb 2009 Posts: 13	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.

February 3rd, 2009, 11:07 PM	#2 (permalink)
Redog Alero Chapter Secretary Join Date: Aug 2006 Location: Newtown, PA Posts: 1,145	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 __________________ Me 2000 Alero running 14's 2005 Nissan Altima (her's) 1967 Olds 330 motor sitting on a stand 1985 Delta 88 w/1968 350 rocket ( MURDERED )

February 4th, 2009, 05:24 AM	#3 (permalink)
Olds64 Landyacht Club President Join Date: Jul 2007 Location: Lawton, OK Posts: 4,286	I agree with Redog. A 350 will be much better than a 307. Check out Summit for parts. __________________ Ferris, my father loves this car more than life itself... Apparently, you don't understand! Ferris, he never drives it! He just rubs it with a diaper! Cameron Frye Ferris Bueller's Day Off 1986

February 4th, 2009, 06:04 AM	#4 (permalink)
Oldsguy Hot Rodder at heart Administrator Join Date: May 2004 Location: Lees Summit MO Posts: 5,360	X3 on the 350 __________________ Dan '77 Cutlass Supreme '46 2 door "The rocket 455.....it's a sledgehammer approach to a thumbtack world" LuxBlue of HAMB.

February 4th, 2009, 06:37 AM	#5 (permalink)
citcapp Super Moderator Join Date: Nov 2007 Location: Bothell, WA Posts: 3,445	X4 on the 350. Ya gotta post pictures too. We have to see the ride __________________ Pat 1957 Super 88 with a 455 1948 2dr series 76 with a 455

February 4th, 2009, 09:53 AM	#6 (permalink)
jaysun ate glue as a child Join Date: Feb 2009 Location: madison wi Posts: 75	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.

February 4th, 2009, 10:15 AM	#7 (permalink)
f-85 Registered User Join Date: Aug 2007 Location: Yorkville,il Posts: 279	X6 Get the 350. __________________ 1964 4DR F-85 455 1964 Olds Super 88 394 (sold to my buddy) 1958 International A-100 Project

February 4th, 2009, 10:45 AM	#8 (permalink)
gscott819 Registered User Join Date: Feb 2009 Posts: 13	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.

February 4th, 2009, 01:26 PM	#9 (permalink)
jaysun ate glue as a child Join Date: Feb 2009 Location: madison wi Posts: 75	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

February 4th, 2009, 02:06 PM	#10 (permalink)
Oldsmaniac Registered User Join Date: Oct 2005 Location: NJ Posts: 702	Nobody suggested the 403?...would be my choice if I wanted to keep it a small block. __________________ OCA Member 2587 '59 98 conv. '66 Delta Fact.4spd '66 Delta conv. '67 442 post trac pac '67 442 conv. '68 Cutlass conv. '70 Rallye 350 '92 Custom Cruiser

February 4th, 2009, 03:38 PM	#11 (permalink)
Olds64 Landyacht Club President Join Date: Jul 2007 Location: Lawton, OK Posts: 4,286	403s are excellent motors as well. They are just a little bit harder to find than a 350. __________________ Ferris, my father loves this car more than life itself... Apparently, you don't understand! Ferris, he never drives it! He just rubs it with a diaper! Cameron Frye Ferris Bueller's Day Off 1986

February 5th, 2009, 01:44 AM	#12 (permalink)
Redog Alero Chapter Secretary Join Date: Aug 2006 Location: Newtown, PA Posts: 1,145	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 __________________ Me 2000 Alero running 14's 2005 Nissan Altima (her's) 1967 Olds 330 motor sitting on a stand 1985 Delta 88 w/1968 350 rocket ( MURDERED )

February 8th, 2009, 01:41 PM	#14 (permalink)
Oldsguy Hot Rodder at heart Administrator Join Date: May 2004 Location: Lees Summit MO Posts: 5,360	I think I might have a full set of "clip on" center caps for those Oldsmobile wheels if you are interested. __________________ Dan '77 Cutlass Supreme '46 2 door "The rocket 455.....it's a sledgehammer approach to a thumbtack world" LuxBlue of HAMB.

February 8th, 2009, 03:46 PM	#15 (permalink)
gearhead1218 Registered User Join Date: Nov 2008 Location: Palmyra, NY Posts: 116	350 would be the easiest to swap in. Love the velour interior. __________________ John Castelli 1970 Oldsmobile Cutlass Supreme 1969 Mercury Cougar Convertible 2003 Chevy Siverado 2003 Chevy Trailblazer 2007 Chevy Impala

February 8th, 2009, 04:03 PM	#16 (permalink)
csstrux Super Moderator Join Date: Sep 2007 Location: Janesville wisconsin Posts: 1,659	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. __________________ Chad Greed: in psychology is an excessive desire to acquire or possess more than what one needs or deserves, especially with respect to material wealth

February 8th, 2009, 05:06 PM	#18 (permalink)
csstrux Super Moderator Join Date: Sep 2007 Location: Janesville wisconsin Posts: 1,659	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. __________________ Chad Greed: in psychology is an excessive desire to acquire or possess more than what one needs or deserves, especially with respect to material wealth

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